Cathodic protection coating composition

Abstract

To provide a coating composition that exhibits excellent cathodic protection even in locations exposed to the atmosphere. [Solution] An electrochemical corrosion protection coating composition (Y) is used, which comprises an ionic polymer (X) having an ionized anionic functional group (A) and having a pH of 5 to 9 at 25°C, preferably having a halogen content of 20 ppm or less of the ionic polymer (X), and the anionic functional group (A) being at least one selected from the group consisting of carboxylic acid anions, phosphate anions, and sulfonate anions.

Description

Technical Field

[0001] The present invention relates to an electrically anticorrosive coating composition.

Background Art

[0002] It is known that the progress of steel corrosion can be suppressed by flowing an anticorrosive current through the steel to lower the potential of the steel to a non-corrosive potential. Generally, this method is called the electro-chemical anticorrosion method, and the impressed current method and the sacrificial anode method are known. In the impressed current method, the positive electrode of a DC power supply device is used as an auxiliary anode, and the negative electrode is connected to the steel to be protected by a conductor to form an electrical circuit, and an anticorrosive current is flowed from the auxiliary anode to the steel. (Patent Document 1) In the sacrificial anode method, a substance having a lower oxidation-reduction potential than the steel to be electrochemically protected, for example, a base metal such as zinc, magnesium, aluminum, or an alloy thereof, is used as a sacrificial anode. The sacrificial anode is connected to the steel by a conductor, and the metal of the sacrificial anode is ionized instead of the steel to prevent the corrosion of the steel. That is, the steel to be protected is used as the cathode, a substance having a lower oxidation-reduction potential than the steel is used as the anode to complete a battery, and an anticorrosive current is flowed through the steel due to the potential difference between the two electrodes. (Patent Document 2)

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Disclosure of the Invention

Problems to be Solved by the Invention

[0004] As an external power supply method, a known method involves applying paint to the target material to form a coating and then applying a corrosion-preventive current from an external power source to prevent corrosion. However, this method is ineffective unless a large amount of inorganic materials are used in the paint, which makes it easy for pinholes to form during painting. Rainwater and other elements can then penetrate through these pinholes, causing rust, resulting in insufficient cathodic protection. On the other hand, the galvanic anode method requires contact with water and consumes substances with low oxidation-reduction potential over time, which means it cannot be used in places exposed to the atmosphere. The object of the present invention is to provide a coating composition that exhibits excellent cathodic protection in locations exposed to the atmosphere. [Means for solving the problem]

[0005] The inventors of this invention arrived at this present invention as a result of diligent research to solve the above problems. In other words, the present invention relates to an electrochemical corrosion protection coating composition (Y) comprising an ionic polymer (X) having an ionized anionic functional group (A) and having a pH of 5 to 9 at 25°C; an electrochemical corrosion protection coating film formed from the electrochemical corrosion protection coating composition (Y); and an electrochemical corrosion protection coating film structure. [Effects of the Invention]

[0006] The cathodic protection coating composition (Y) of the present invention provides the following effects. (1) Excellent cathodic protection in areas exposed to the atmosphere. [Modes for carrying out the invention]

[0007] The present invention will be described in detail below.

[0008] The cathodic protection coating composition (Y) of the present invention is a cathodic protection coating composition comprising an ionic polymer (X) having an ionized anionic functional group (A) and a pH of 5 to 9 at 25°C.

[0009] The ionic polymer (X) is not particularly limited, and any known polymer having an ionized anionic functional group (A) can be used. From the viewpoint of corrosion resistance, the ionized anionic functional group (A) is preferably at least one selected from the group consisting of carboxylic acid anions, phosphate anions, and sulfonate anions. Examples of known polymers include urethane resins, acrylic resins, and epoxy resins, with urethane resins and acrylic resins being preferred.

[0010] Examples of urethane resins include polymers obtained by polymerizing polyisocyanates, polyols having anionic functional groups (A), and polyols other than polyols having anionic functional groups (A).

[0011] The urethane resin may consist of one type of urethane resin, or it may be a mixture of two or more types of urethane resins.

[0012] Examples of the polyisocyanates include aromatic polyisocyanates having 8 to 16 carbon atoms, linear aliphatic polyisocyanates having 5 to 12 carbon atoms, and alicyclic polyisocyanates having 9 to 15 carbon atoms. These polyisocyanates may have 2 to 3 or more isocyanate groups.

[0013] The polyisocyanate may consist of one type of polyisocyanate, or it may be a mixture of two or more types of polyisocyanates.

[0014] Examples of the aforementioned aromatic polyisocyanates having 8 to 16 carbon atoms include 1,3-phenylenediisocyanate, 1,4-phenylenediisocyanate, 2,4-tolylenediisocyanate, 2,6-tolylenediisocyanate, crude tolylenediisocyanate, 4,4'-diphenylmethanediisocyanate, 2,4'-diphenylmethanediisocyanate, crude diphenylmethanediisocyanate, m-xylylenediisocyanate, 4,4'-diisocyanatobiphenyl, 4,4'-diisocyanato-3,3'-dimethylbiphenyl, and 1,5-diisocyanatonaphthalene.

[0015] Examples of the chain-like aliphatic polyisocyanates having 5 to 12 carbon atoms include pentamethylene diisocyanate, hexamethylene diisocyanate, and trimethylhexamethylene diisocyanate (a mixture of 2,2,4- and 2,4,4-).

[0016] Examples of the alicyclic polyisocyanates having 9 to 15 carbon atoms include isophorone diisocyanate, dicyclohexylmethane-4,4'-diisocyanate, 1,4-bis(isocyanatomethyl)cyclohexane, and norbornane diisocyanate.

[0017] Examples of polyols having an anionic functional group (A) include diols having a carboxyl group, a sulfonic acid group, a sulfamic acid group, and a phosphate group. Diols containing a carboxyl group include diallylalkanoic acids. Diarylalkanoic acids have 6 to 24 carbon atoms and specifically include 2,2-dimethylolpropionic acid (DMPA), 2,2-dimethylolbutanoic acid, 2,2-dimethylolheptanoic acid, and 2,2-dimethyloloctanoic acid. Examples of diols having a sulfonic acid group or a sulfamic acid group include 3-(2,3-dihydroxypropoxy)-1-propanesulfonic acid, sulfisophthalic acid di(ethylene glycol) ester, and sulfamic acid diol. Examples of the diol having a phosphate group include phosphate esters of polyols. Examples of the phosphate ester of a polyol include bis(2-hydroxyethyl)hydroxyphosphate, bis(4-hydroxybutyl)phosphate, bis(11-hydroxyundecyl)phosphate, and the like.

[0018] Examples of polyols other than the polyol having an anionic functional group (A) include polyols selected from at least one of the group consisting of polyoxyalkylene diols, polyester diols, and polycarbonate diols.

[0019] The polyol may consist of one type of polyol or may be a mixture of two or more types of polyols.

[0020] The polyoxyalkylene diol is preferably a polyether diol having an oxyalkylene group with 2 to 4 carbon atoms, and more preferably selected from at least one of the group consisting of polyoxyethylene diol, polyoxypropylene diol, propylene oxide-ethylene oxide copolymer diol (random and / or block copolymer), and polytetramethylene ether glycol.

[0021] The number average molecular weight of the polyoxyalkylene diol is preferably 500 to 20,000, more preferably 1,000 to 15,000, and still more preferably 2,000 to 10,000.

[0022] Examples of the polyester diol include polyester diols obtained by condensation of at least one diol selected from the group consisting of aliphatic diols and aromatic diols having 2 to 10 carbon atoms and at least one dicarboxylic acid selected from the group consisting of aliphatic dicarboxylic acids having 2 to 10 carbon atoms and aromatic dicarboxylic acids having 8 to 12 carbon atoms.

[0023] Examples of the aliphatic diols having 2 to 10 carbon atoms include ethylene glycol, propylene glycol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 3-methyl-1,5-pentanediol, 1,7-heptanediol, 2,2-diethyl-1,3-propanediol, 1,8-octanediol, 1,9-nonanediol, and 1,10-decanediol.

[0024] Examples of the aromatic diols include 1,4-benzenedimethanol and 1,4-benzenediethanol.

[0025] Examples of the aliphatic dicarboxylic acids having 2 to 10 carbon atoms include oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, maleic acid, and fumaric acid.

[0026] Furthermore, the aliphatic dicarboxylic acid having 2 to 10 carbon atoms may also have a ring structure. Examples of aliphatic dicarboxylic acids having the aforementioned ring structure and having 2 to 10 carbon atoms include 1,1-cyclopropanedicarboxylic acid, 1,1-cyclobutanedicarboxylic acid, 1,2-cyclohexanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid, and bicyclo[2.2.2]octane-1,4-dicarboxylic acid.

[0027] Examples of the aforementioned aromatic dicarboxylic acids having 8 to 12 carbon atoms include terephthalic acid, isophthalic acid, 1,4-naphthalenedicarboxylic acid, 2,3-naphthalenedicarboxylic acid, and 2,6-naphthalenedicarboxylic acid.

[0028] The number-average molecular weight of the polyester diol is preferably 1,000 to 20,000, more preferably 1,500 to 15,000, and even more preferably 2,000 to 10,000.

[0029] Examples of the polycarbonate diol include a polycarbonate diol produced by condensing one or more diols selected from the group consisting of aliphatic diols having 2 to 10 carbon atoms and aromatic diols with a low molecular weight carbonate compound [for example, a dialkyl carbonate with an alkyl group having 1 to 6 carbon atoms, an alkylene carbonate having an alkylene group having 2 to 6 carbon atoms, and a diaryl carbonate having an aryl group having 6 to 9 carbon atoms, etc.] while undergoing a de-alcoholization reaction. Two or more diols and low molecular weight carbonate compounds may be used in combination.

[0030] Specific examples of polycarbonate diols include polyhexamethylene carbonate diol, polypentamethylene carbonate diol, polytetramethylene carbonate diol, and poly(pentamethylene / hexamethylene) carbonate diol [for example, a diol obtained by condensing 1,5-pentanediol and 1,6-hexanediol with a dialkyl carbonate while de-alcoholizing them].

[0031] Examples of acrylic resins include polymers obtained by homopolymerizing or copolymerizing monomers having an anionic functional group (A) and a polymerizable double bond. Monomers having an anionic functional group (A) and a polymerizable double bond include unsaturated monocarboxylic acids having 3 to 30 carbon atoms [e.g., (meth)acrylic acid (representing acrylic acid and / or methacrylic acid; the same applies hereinafter), crotonic acid, isocrotonic acid, cinnamic acid, etc. and their esters, etc.], unsaturated dicarboxylic acids (anhydrides) having 3 to 30 carbon atoms [e.g., (anhydride) maleic acid, fumaric acid, itaconic acid, (anhydride) citraconic acid and mesaconic acid, etc.], and monoalkyl of unsaturated dicarboxylic acids having 3 to 30 carbon atoms. C1-C24 esters [e.g., monomethyl maleate, monooctadecyl maleate, monoethyl fumarate, monobutyl itaconate, glycol itaconate monoether, and monoeicosyl citraconate], phosphate ester compounds [mono(2-hydroxyethyl methacrylate) phosphate, 2-(meth)acryloyloxyethyl acid phosphate, bis[2-{(meth)acryloyloxy}ethyl]] Acid phosphate, diphenyl-2-methacryloyloxyethyl phosphate, C2-C6 alkenesulfonic acids [vinyl sulfonic acid and (meth)allyl sulfonic acid, etc.], C6-C12 aromatic vinyl group-containing sulfonic acids [α-methylstyrene sulfonic acid, etc.], sulfonic acid group-containing (meth)acrylic ester monomers [sulfopropyl (meth)acrylate and 2-(meth)acryloyloxyethanesulfonic acid, etc.], sulfonic acid group-containing (meth)acrylic Examples include mid-type monomers [such as 2-(meth)acrylamide-2-methylpropanesulfonic acid], vinyl monomers containing sulfonic acid groups and hydroxyl groups [such as 3-(meth)acrylamide-2-hydroxypropanesulfonic acid, 3-alyloxy-2-hydroxypropanesulfonic acid, and 3-(meth)acryloyloxy-2-hydroxypropanesulfonic acid], and alkyl (3-18 carbon atoms) allyl sulfosuccinate esters [such as dodecylallyl sulfosuccinate ester]. Other monomers having polymerizable double bonds include styrene, (meth)acrylate esters having alkyl groups with 1 to 30 carbon atoms [(meth)acrylate, ( Examples include (meth)tetracosyl acrylate, (meth)pentacosyl acrylate, (meth)hexacylate, (meth)heptacosyl acrylate, (meth)octacosyl acrylate, (meth)nonacosyl acrylate, and (meth)triacontyl acrylate, etc.; (meth)acrylamides having alkyl groups with 1 to 6 carbon atoms [N-methyl(meth)acrylamide, N-ethyl(meth)acrylamide, N-isopropyl(meth)acrylamide, and N-butyl(meth)acrylamide, etc.]; and N-(meth)acrylamides containing a heterocyclic skeleton [N-(meth)acryloylmorpholine, N-(meth)acryloylthiomorpholine, N-(meth)acryloylpiperidine, N-(meth)acryloylpyrrolidine, and N-(meth)acryloylpiperidine, etc.].

[0032] Examples of epoxy resins include phenol novolac type epoxy resins, naphthol novolac type epoxy resins, cresol novolac type epoxy resins, bisphenol A type epoxy resins, bisphenol F type epoxy resins, bisphenol S type epoxy resins, bisphenol AF type epoxy resins, biphenyl type epoxy resins, naphthalene type epoxy resins, naphthol type epoxy resins, naphthylene ether type epoxy resins, glycidyl ester type epoxy resins, dicyclopentadiene type epoxy resins, trisphenol type epoxy resins, anthracene type epoxy resins, glycidyl ester type epoxy resins, glycidylamine type epoxy resins, epoxy resins having a butadiene structure, alicyclic epoxy resins, heterocyclic epoxy resins, spiroring-containing epoxy resins, cyclohexanedimethanol type epoxy resins, trimethylol type epoxy resins, and tetraphenylethane type epoxy resins. The above epoxy resins may be used individually or in combination of two or more types.

[0033] There are no particular restrictions on the counterion of the ionized anionic functional group (A) of the ionic polymer (X), and any known cation capable of forming an ionic polymer can be used. Examples of known cations include ammonium cations, primary ammonium cations, secondary ammonium cations, tertiary ammonium cations, quaternary ammonium cations, and amidinium cations.

[0034] Examples of ammonium cations include unsubstituted ammonium ions.

[0035] Examples of primary ammonium cations include ammonium cations having 1 to 3 carbon atoms (such as methylammonium, ethylammonium, propylammonium, and isopropylammonium).

[0036] Examples of secondary ammonium cations include ammonium cations having 2 to 6 carbon atoms (such as dimethylammonium, diethylammonium, methylethylammonium, methylpropylammonium, and methylisopropylammonium).

[0037] Examples of tertiary ammonium cations include ammonium cations having 3 to 9 carbon atoms (such as trimethylammonium, triethylammonium, dimethylethylammonium, dimethylpropylammonium, methylmorpholinium, and dimethylisopropylammonium).

[0038] Examples of quaternary ammonium cations include cations represented by the following general formula (1).

[0039] [ka] [In general formula (1), R1 to R4 each independently represent a linear or branched alkyl group having 1 to 10 carbon atoms.]

[0040] Examples of amidinium cations include the cation represented by the following general formula (2) and the cation represented by the following general formula (3).

[0041] [ka] [In general formula (2), R5 and R7 each independently represent a linear or branched alkyl group having 1 to 10 carbon atoms, and R6, R8, and R9 each independently represent a hydrogen atom or a linear or branched alkyl group having 1 to 10 carbon atoms.]

[0042] [ka] [In general formula (3), R 10 , R 12 Each is independently a linear or branched alkyl group having 1 to 10 carbon atoms, R 11R is a hydrogen atom or a linear or branched alkyl group having 1 to 10 carbon atoms. 13 , R 14 Each of these independently represents a linear or branched alkyl group having 1 to 10 carbon atoms. Furthermore, R 10 ~R 14 Some or all of these may be bonded together in groups of 2 to 4 to form a 2- to 4-valent group, creating a heterocycle with the nitrogen atom.

[0043] Specific examples of the above general formulas (2) and (3) include cations such as 1,2,3,4-tetramethylimidazolinium, 1,3,4-trimethyl-2-ethylimidazolinium, 1,3-dimethyl-2,4-diethylimidazolinium, 1,2-dimethyl-3,4-diethylimidazolinium, 1,3-dimethylimidazolium, 1,3-diethylimidazolium, 1-ethyl-3-methylimidazolium, and 1,2,3-trimethylimidazolium.

[0044] From the viewpoint of corrosion resistance, preferred counterions are amidinium cations and / or quaternary ammonium cations, more preferably at least one cation selected from the group consisting of cations represented by general formula (1), cations represented by general formula (2), and cations represented by general formula (3), and even more preferably 1-ethyl-3-methylimidazolium.

[0045] The ionic polymer (X) may also contain pH adjusters and inorganic salts such as nitrates and phosphates as components other than those mentioned above.

[0046] The ionic polymer (X) has a pH of 5 to 9 at 25°C, preferably 5.5 to 8.0, and more preferably 6.5 to 7.3, from the viewpoint of corrosion resistance. The pH of the ionic polymer (X) is particularly important from the viewpoint of corrosion resistance to metals; if the pH is less than 5, it will cause the metal surface to penetrate, and if the pH is greater than 9, the chemical polishing power will decrease. If the pH is outside the range of 5 to 9, the composition ratio of acid and amine is biased towards either acid or amine, so the pH can be adjusted by measuring the acid value or amine value of the ionic polymer (X) and adding a counterion or acid component corresponding to the obtained value.

[0047] The pH of the ionic polymer (X) is measured by the glass electrode method in accordance with the method described in JIS Z8802, using a prepared solution in which the ionic polymer (X) is dissolved in a solution of water and isopropanol mixed in a volume ratio of 60:100 to a concentration of 16% by weight.

[0048] From the viewpoint of corrosion prevention, the halogen content of the ionic polymer (X) is preferably 20 ppm or less, and more preferably 10 ppm or less. If the halogen content is within this range, metal corrosion due to halogens can be prevented. Unless intentionally added, halogens are mainly present in the raw materials used when synthesizing ionic polymers (X), and when halogenated salts are used as cations. If the halogen content is higher than 20 ppm, the halogen content can be reduced by dissolving it in acetone or the like and then passing it through a column packed with alumina, for example.

[0049] The halogen content of the ionic polymer (X) can be determined by diluting the ionic polymer (X) 100 to 10 times with ultrapure water, performing ion chromatography under the following conditions to determine the content of various halogens, and then calculating the sum of the obtained halogen content. Equipment: Ion chromatograph (Thermo SCIENTIFIC: Dionex ICS-5000+DC) Column: IonPack AS-22 + IonPack AG-22 Suppressor: ARES 4mm Solvent: Mixed solution of 4.5 mM sodium carbonate and 1 mM sodium bicarbonate. Standard sample: Anion mixed standard solution IV (Kanto Chemical) Measurement temperature: 35℃ Flow rate: 1.2mL / min

[0050] From the viewpoint of chemical polishing, it is preferable that the total amine value of the ionic polymer (X) is 2 mg KOH / g or less. If the total amine value is greater than 2 mg KOH / g, the amine value can be reduced by adding an acid component equal to the acid value corresponding to the value.

[0051] The total amine number of the ionic polymer (X) was measured according to the method of ASTM D2074.

[0052] From the viewpoint of corrosion prevention, the acid value of the ionic polymer (X) is preferably 30 mg KOH / g or less. Having an acid value of 30 mg KOH / g or less suppresses the reduction in corrosion resistance due to metal corrosion caused by acid.

[0053] The acid value of ionic polymer (X) can be adjusted by adding a basic compound. The acid value of ionic polymer (X) is measured by methods such as JIS K 0070.

[0054] The concentration of ionized anionic functional groups (A) in the ionic polymer (X) is preferably 0.1 to 2.5 mol / kg, and more preferably 0.4 to 2.1 mol / kg, from the viewpoint of electrochemical corrosion protection and ease of coating.

[0055] The weight-average molecular weight of the ionic polymer (X) is preferably 5,000 to 300,000, and more preferably 10,000 to 200,000, from the viewpoint of coating film strength and coating viscosity. The weight-average molecular weight of (X) can be measured by gel permeation chromatography.

[0056] The method for producing the ionic polymer (X) is not particularly limited, but preferred production methods when the counterion is a quaternary ammonium cation are exemplified below.

[0057] Manufacturing method A tertiary amine (the tertiary amine before the formation of a quaternary ammonium cation) is reacted with an equivalent or greater amount (e.g., 1.1 to 5.0 equivalents) of a dialkyl carbonate ester (e.g., dimethyl carbonate, diethyl carbonate) in or without a solvent (e.g., methanol) at a reaction temperature of 80 to 200°C, preferably 100 to 150°C, to form a quaternary ammonium salt. Next, a polymer having an anionic functional group (A') that forms the anion is prepared, after which the quaternary ammonium salt is added (0.9 to 1.1 equivalents based on the equivalent amount of the anionic functional group (A')), and the mixture is stirred at 10 to 100°C for 1 to 10 hours to exchange the salt. The solvent is removed by distillation under reduced pressure at 80 to 120°C to obtain the desired ionic polymer (X). Here, as a tertiary amine, if the target quaternary ammonium cation is the amidinium cation mentioned above, examples include 1,2-dimethylimidazole, 1-methylimidazole, and 1-ethylimidazole.

[0058] The cathodic protection coating composition (Y) may also contain solvents and additives as components other than the ionic polymer (X).

[0059] Examples of solvents include ester solvents (ethyl acetate, butyl acetate, and ethyl cellosolve acetate, etc.), ketone solvents (acetone, methyl ethyl ketone, and methyl isobutyl ketone, etc.), ether solvents (dioxane, tetrahydrofuran, and propylene glycol monomethyl ether, etc.), aliphatic hydrocarbon solvents (n-hexane, n-heptane, cyclohexane, methylcyclohexane, etc.), and alcohol solvents (ethanol, methanol, n-propyl alcohol, isopropyl alcohol, and n-butyl alcohol (n-butanol), etc.).

[0060] Examples of additives include pigments, curing agents, diluents, leveling agents such as acrylic resins and silicone resins, silicone-based and acrylic-based anti-repellent agents, anti-skinning agents, thixotropes, defoaming agents, anti-separation agents, smoothing agents, wetting agents, dispersants, thickeners, anti-settling agents, polymerization inhibitors, structural viscosity modifiers, electrostatic coating properties improvers, anti-sagging agents, curing accelerators, antioxidants, light stabilizers, flame retardants, and coating aids. Preferred examples of light stabilizers and antioxidants include compounds described in Japanese Patent Application Publication No. 2004-117997.

[0061] The content of the ionic polymer (X) in the electrochemical corrosion protection coating composition (Y) of the present invention is preferably 20 to 100% by weight, and more preferably 30 to 100% by weight, based on the weight of (Y).

[0062] The solvent content in the electrochemical corrosion protection coating composition (Y) of the present invention is preferably 0 to 80% by weight, and more preferably 0 to 70% by weight, based on the weight of (Y).

[0063] The additive content in the cathodic protection coating composition (Y) of the present invention is preferably 0 to 10% by weight, and more preferably 0 to 20% by weight, based on the weight of (Y).

[0064] The electrochemical corrosion protection coating composition (Y) of the present invention may contain water, but from the viewpoint of corrosion protection, the water content is preferably 2.0% by weight or less, and more preferably 1.0% by weight or less, relative to the ionic polymer (X). If the water content exceeds 2.0% by weight, the water may adhere to the metal surface to be protected, causing hydroxide formation and potentially reducing corrosion protection.

[0065] The water content can be evaluated using the Karl Fischer assay.

[0066] The halogen content of the cathodic protection coating composition (Y) of the present invention is preferably 20 ppm or less from the viewpoint of corrosion prevention, and more preferably 10 ppm or less. If the halogen content is within this range, metal corrosion caused by halogens can be suppressed. Unless intentionally added, halogens are mainly present in the raw materials used when synthesizing ionic polymers (X), and when halogenated salts are used as cations. If the halogen content is higher than 20 ppm, the halogen content can be reduced by dissolving it in acetone or the like and then passing it through a column packed with alumina, for example.

[0067] The halogen content of the corrosion-resistant coating composition (Y) can be measured in the same manner as that of the ionic polymer (X).

[0068] The corrosion-preventive coating composition (Y) of the present invention can be obtained by using the ionic polymer (X) as is, or by melt-mixing or solution-mixing additives as needed. As a melt-mixing method, generally, each component in pellet form, powder form, or liquid form can be mixed in a suitable mixer (such as a Henschel mixer), and then mixed in an extruder to form pellets. As a solution-mixing method, one or both of (X) and the additive can be mixed in the form of a solution in a solvent. Examples of solvents used in solution mixing include alcohols [e.g., monoalcohols such as methanol, ethanol, and isopropanol, and diols such as ethylene glycol and propylene glycol], ethers [e.g., diethylene glycol, tetrahydrofuran, and 1,4-dioxane], ketones [e.g., acetone, methyl ethyl ketone, methyl isopropyl ketone, and methyl isobutyl ketone], and esters [ethyl acetate, propyl acetate, butyl acetate, methyl propionate, ethyl propionate, and butyl cellosolve acetate]. This includes amides [e.g., dimethylformamide, diethylformamide, dimethylacetamide, and N-methylpyrrolidone], aromatic hydrocarbons [e.g., benzene, toluene, xylene, ethylbenzene, triethylbenzene, amylbenzene, diamylbenzene, amyltoluene, diphenylethane, and tetralin], aliphatic hydrocarbons [e.g., hexane, heptane, octane, and decane], alicyclic hydrocarbons [e.g., cyclohexane, cyclohexene, methylcyclohexane, and decalin], and other solvents, as well as mixtures of two or more of these.

[0069] The electrochemical corrosion protection coating of the present invention is an electrochemical corrosion protection coating formed from the above-mentioned electrochemical corrosion protection coating composition (Y). Similar to the case in which conventional electrochemical corrosion protection paints are formed from conventional electrochemical corrosion protection coating compositions, the electrochemical corrosion protection coating of the present invention is formed by uniformly applying the electrochemical corrosion protection coating composition of the present invention to an object.

[0070] The thickness of the electrochemical protective coating of the present invention is not particularly limited and can be set to an appropriate range depending on the characteristics of the electrochemical protective coating of the present invention (e.g., coating wear rate) and application (type of substrate, period of use, etc.). For example, a thickness of 30 to 10,000 μm is preferred immediately after formation.

[0071] The electrochemical corrosion protection coating structure of the present invention is a coating structure in which a conductive coating is laminated on the upper surface of the electrochemical corrosion protection coating. Examples of conductive coatings include a coating obtained by dispersing conductive substances such as nickel, zinc, conductive carbon, and conductive polymers in an organic solvent to form a paste, and then applying the resulting paste by a coating method such as gravure coating, bar coating, or screen coating, and then drying it. The electrochemical corrosion protection coating structure in which a conductive coating is laminated on the upper surface of the electrochemical corrosion protection coating has excellent corrosion resistance. [Examples]

[0072] The following describes embodiments of the present invention, but the present invention is not limited to these embodiments. In the following, "parts" refers to parts by weight.

[0073] <Manufacturing Example 1> A solution of 135 parts (1.5 moles) of dimethyl carbonate dissolved in 192 parts of methanol was added to a stirred autoclave, and 96 parts (1.0 mole) of 1-ethylimidazole was added dropwise using a dropper funnel. The mixture was then stirred at 130°C for 40 hours to obtain 1-ethyl-3-methylimidazolium methyl carbonate salt (Z-1).

[0074] <Manufacturing Example 2> 311 parts (1.0 mol) of didecylmethylamine, 90 parts (1.0 mol) of dimethyl carbonate, and 64 parts of methanol as a solvent were charged into a stirred autoclave, and the mixture was reacted at a reaction temperature of 110°C for 12 hours to obtain didecyldimethylammonium methyl carbonate salt (Z-2).

[0075] <Manufacturing Example 3> 98 parts (1.0 mol) of 2,4-dimethylimidazoline, 180 parts (2.0 mol) of dimethyl carbonate, and 57 parts of methanol as a solvent were charged into a stirred autoclave, and the mixture was reacted at a reaction temperature of 120°C for 12 hours to obtain 1,2,3,4-tetramethylimidazolinium methyl carbonate salt (Z-3).

[0076] <Example 1> A stainless steel pressure-resistant reaction vessel equipped with a stirrer, thermometer, heating / cooling device, nitrogen inlet tube, and depressurization device contains 750 parts of polycarbonate polyol [product name "Kuraray Polyol C-2090", manufactured by Kuraray Co., Ltd., molecular weight 2,000], 63 parts of dimethylolpropionic acid [product name "2,2-bis(hydroxymethyl)propionic acid", manufactured by Tokyo Chemical Industry Co., Ltd., molecular weight 134], 187 parts of isophorone diisocyanate [product name "Desmodule I", manufactured by Sumika Covestrourethane Co., Ltd., molecular weight 222], and a urethane catalyst [manufactured by Nitto Chemical Co., Ltd.]. 0.9 parts of Neostan U-600, 0.9 parts of the gelling inhibitor "Diethyl malonate manufactured by Tateyama Chemical Co., Ltd.", 1000 parts of toluene and 1000 parts of ethyl acetate were charged together, stirred and mixed under a nitrogen atmosphere, and reacted at 80°C for 10 hours. Then 80 parts of (Z-1) were added, and the mixture was stirred at 90°C for 4 hours to remove carbon dioxide, thereby obtaining an electrochemical corrosion protection coating composition (Y-1) containing an ionic polymer (X-1) with a weight-average molecular weight of 31,000 and a concentration of ionized anionic functional group (A) of 0.5 mol / kg.

[0077] <Example 2> A stainless steel pressure-resistant reaction vessel equipped with a stirrer, thermometer, heating / cooling device, nitrogen inlet tube and depressurization device contains 620 parts of polypropylene glycol [product name "Sannix PP-1000", manufactured by Sanyo Chemical Industries, Ltd., molecular weight 1000], 76 parts of dimethylolpropionic acid [product name "2,2-bis(hydroxymethyl)propionic acid", manufactured by Tokyo Chemical Industries, Ltd., molecular weight 134], 304 parts of 4,4'-methylene biscyclohexyl diisocyanate [product name "Desmodule W", manufactured by Sumika Covestroururethane Co., Ltd., molecular weight 262], and a urethane catalyst "Nitto 0.9 parts of Neostan U-600 manufactured by Kasei Co., Ltd., 0.9 parts of the gelling inhibitor Diethyl malonate manufactured by Tateyama Kasei Co., Ltd., 1000 parts of toluene and 1000 parts of ethyl acetate were charged together, stirred and mixed under a nitrogen atmosphere, and reacted at 80°C for 12 hours. Then 220 parts of (Z-2) were added, and the mixture was stirred at 90°C for 4 hours to remove carbon dioxide, thereby obtaining an electrochemical corrosion protection coating composition (Y-2) containing an ionic polymer (X-2) with a weight-average molecular weight of 20,000 and a concentration of ionized anionic functional group (A) of 0.6 mol / kg.

[0078] <Example 3> A stainless steel pressure-resistant reaction vessel equipped with a stirrer, thermometer, heating / cooling device, nitrogen inlet tube and depressurization device contains 500 parts of polytetramethylene glycol [product name "PTMG-1000", manufactured by Mitsubishi Chemical Corporation, molecular weight 1000], 125 parts of dimethylolpropionic acid [product name "2,2-bis(hydroxymethyl)propionic acid", manufactured by Tokyo Chemical Industry Co., Ltd., molecular weight 134], 375 parts of 4,4'-methylenebiscyclohexyl diisocyanate [product name "Desmodule W", manufactured by Sumika Covestrourethane Co., Ltd., molecular weight 262], and a urethane catalyst "Nitto 0.9 parts of Neostan U-600 manufactured by Kasei Co., Ltd., 0.9 parts of the gelling inhibitor Diethyl malonate manufactured by Tateyama Kasei Co., Ltd., 1000 parts of toluene and 1000 parts of ethyl acetate were charged together, stirred and mixed under a nitrogen atmosphere, and reacted at 80°C for 12 hours. Then 171 parts of (Z-3) were added, and the mixture was stirred at 90°C for 4 hours to remove carbon dioxide, thereby obtaining an electrochemical corrosion protection coating composition (Y-3) containing an ionic polymer (X-3) with a weight-average molecular weight of 24,000 and a concentration of ionized anionic functional group (A) of 0.9 mol / kg.

[0079] <Example 4> 2000 parts of ethyl acetate were charged into a stainless steel pressure-resistant reaction vessel equipped with a stirrer, thermometer, heating / cooling device, nitrogen inlet tube, and depressurization device. Under stirring, nitrogen was supplied to replace the nitrogen in the reaction vessel (gas phase oxygen concentration of 400 ppm or less). After raising the temperature to 78°C while blowing nitrogen into the system, a solution of 580 parts of butyl acrylate [product name "butyl acrylate", manufactured by Mitsubishi Chemical Corporation, molecular weight 128], 300 parts of styrene [product name "styrene monomer", manufactured by Asahi Kasei Corporation, molecular weight 104], and 120 parts of acrylic acid [product name "acrylic acid", manufactured by Nippon Shokubai Co., Ltd., molecular weight 72] was simultaneously added dropwise over 2 hours to 8 parts of dilauroyl peroxide [product name "Perloyl L", manufactured by NOF Corporation, molecular weight 399]. The polymerization reaction was then carried out by stirring at 78°C for 4 hours. Next, 282 parts of (Z-1) were added, and the mixture was stirred at 90°C for 4 hours to remove carbon dioxide, yielding an electrochemical corrosion protection coating composition (Y-4) containing an ionic polymer (X-4) with a weight-average molecular weight of 38,000 and a concentration of ionized anionic functional group (A) of 1.7 mol / kg.

[0080] <Example 5> 2000 parts of ethyl acetate were charged into a stainless steel pressure-resistant reaction vessel equipped with a stirrer, thermometer, heating / cooling device, nitrogen inlet tube, and depressurization device. Under stirring, nitrogen was supplied to replace the nitrogen in the reaction vessel (gas phase oxygen concentration of 400 ppm or less). After raising the temperature to 78°C while blowing nitrogen into the system, a solution of 250 parts of styrene [product name "Styrene Monomer", manufactured by Asahi Kasei Corporation, molecular weight 104], 600 parts of methyl methacrylate [product name "Acryester M", manufactured by Mitsubishi Chemical Corporation, molecular weight 100], and 150 parts of acrylic acid [product name "Acrylic Acid", manufactured by Nippon Shokubai Co., Ltd., molecular weight 72] was simultaneously added dropwise over 2 hours to 6 parts of dilauroyl peroxide [product name "Perloyl L", manufactured by NOF Corporation, molecular weight 399]. The polymerization reaction was then carried out by stirring at 78°C for 4 hours. Next, 380 parts of (Z-3) were added, and the mixture was stirred at 90°C for 4 hours to remove carbon dioxide, yielding an electrochemical corrosion protection coating composition (Y-5) containing an ionic polymer (X-5) with a weight-average molecular weight of 44,000 and a concentration of ionized anionic functional group (A) of 2.1 mol / kg.

[0081] <Example 6> 2000 parts of ethyl acetate were charged into a stainless steel pressure-resistant reaction vessel equipped with a stirrer, thermometer, heating / cooling device, nitrogen inlet tube, and depressurization device. Under stirring, nitrogen was supplied to replace the nitrogen in the reaction vessel (gas phase oxygen concentration of 400 ppm or less). After raising the temperature to 78°C while blowing nitrogen into the system, a solution of 800 parts of butyl acrylate [product name "butyl acrylate", manufactured by Mitsubishi Chemical Corporation, molecular weight 128], 170 parts of styrene [product name "styrene monomer", manufactured by Asahi Kasei Corporation, molecular weight 104], and 30 parts of acrylic acid [product name "acrylic acid", manufactured by Nippon Shokubai Co., Ltd., molecular weight 72] was simultaneously added dropwise over 2 hours to 5 parts of dilauroyl peroxide [product name "Perloyl L", manufactured by NOF Corporation, molecular weight 399]. The polymerization reaction was then carried out by stirring at 78°C for 4 hours. Next, 160 parts of (Z-2) were added, and the mixture was stirred at 90°C for 4 hours to remove carbon dioxide, yielding an electrochemical corrosion protection coating composition (Y-6) containing an ionic polymer (X-6) with a weight-average molecular weight of 54,000 and a concentration of ionized anionic functional group (A) of 0.4 mol / kg.

[0082] <Example 7> 2000 parts of ethyl acetate were charged into a stainless steel pressure-resistant reaction vessel equipped with a stirrer, thermometer, heating / cooling device, nitrogen inlet tube, and depressurization device. Under stirring, nitrogen was supplied to replace the nitrogen in the reaction vessel (gas phase oxygen concentration of 400 ppm or less). After raising the temperature to 78°C while blowing nitrogen into the system, a solution of 500 parts of butyl acrylate [product name "butyl acrylate", manufactured by Mitsubishi Chemical Corporation, molecular weight 128], 300 parts of styrene [product name "styrene monomer", manufactured by Asahi Kasei Corporation, molecular weight 104], and 200 parts of mono(2-hydroxyethyl methacrylate) phosphate [product name "JAMP-514", manufactured by Johoku Chemical Industry Co., Ltd., molecular weight 210] was simultaneously added dropwise over 2 hours to 8 parts of dilauroyl peroxide [product name "Perloyl L", manufactured by NOF Corporation, molecular weight 399]. The polymerization reaction was then carried out by stirring at 78°C for 4 hours. Next, 325 parts of (Z-1) were added, and the mixture was stirred at 90°C for 4 hours to remove carbon dioxide, yielding an electrochemical corrosion protection coating composition (Y-7) containing an ionic polymer (X-7) with a weight-average molecular weight of 37,000 and a concentration of ionized anionic functional group (A) of 1.9 mol / kg.

[0083] <Example 8> 2000 parts of ethyl acetate were charged into a stainless steel pressure-resistant reaction vessel equipped with a stirrer, thermometer, heating / cooling device, nitrogen inlet tube, and depressurization device. Under stirring, nitrogen was supplied to replace the nitrogen in the reaction vessel (gas phase oxygen concentration of 400 ppm or less). After raising the temperature to 78°C while blowing nitrogen into the system, a solution of 500 parts of butyl acrylate [product name "butyl acrylate", manufactured by Mitsubishi Chemical Corporation, molecular weight 128], 300 parts of styrene [product name "styrene monomer", manufactured by Asahi Kasei Corporation, molecular weight 104], and 200 parts of 2-acrylamido-2-methylpropanesulfonic acid [product name "2-acrylamido-2-methylpropanesulfonic acid", manufactured by Tokyo Chemical Industry Co., Ltd., molecular weight 248] was simultaneously added dropwise over 2 hours to 8 parts of dilauroyl peroxide [product name "Perloyl L", manufactured by NOF Corporation, molecular weight 399]. The polymerization reaction was then carried out by stirring at 78°C for 4 hours. Next, 165 parts of (Z-1) were added, and the mixture was stirred at 90°C for 4 hours to remove carbon dioxide, yielding an electrochemical corrosion protection coating composition (Y-8) containing an ionic polymer (X-8) with a weight-average molecular weight of 42,000 and a concentration of ionized anionic functional group (A) of 1.0 mol / kg.

[0084] <Example 9> 2000 parts of ethyl acetate were charged into a stainless steel pressure-resistant reaction vessel equipped with a stirrer, thermometer, heating / cooling device, nitrogen inlet tube, and depressurization device. Under stirring, nitrogen was supplied to replace the nitrogen in the reaction vessel (gas phase oxygen concentration of 400 ppm or less). After raising the temperature to 78°C while blowing nitrogen into the system, a solution of 500 parts of butyl acrylate [product name "butyl acrylate", manufactured by Mitsubishi Chemical Corporation, molecular weight 128], 320 parts of acryloylmorpholine [product name "ACMO", manufactured by KJ Chemicals Co., Ltd., molecular weight 141], and 180 parts of acrylic acid [product name "acrylic acid", manufactured by Nippon Shokubai Co., Ltd., molecular weight 72] was simultaneously added dropwise over 2 hours to 8 parts of dilauroyl peroxide [product name "Perloyl L", manufactured by NOF Corporation, molecular weight 399]. The polymerization reaction was then carried out by stirring at 78°C for 4 hours. Next, 423 parts of (Z-1) were added, and the mixture was stirred at 90°C for 4 hours to remove carbon dioxide, yielding an electrochemical corrosion protection coating composition (Y-9) containing an ionic polymer (X-9) with a weight-average molecular weight of 44,000 and a concentration of ionized anionic functional group (A) of 2.5 mol / kg.

[0085] <Comparative Example 1> A stainless steel pressure-resistant reaction vessel equipped with a stirrer, thermometer, heating / cooling device, nitrogen inlet tube, and depressurization device contained 750 parts of polycarbonate polyol [product name "Kuraray Polyol C-2090", manufactured by Kuraray Co., Ltd., molecular weight 2,000], 63 parts of dimethylolpropionic acid [product name "2,2-bis(hydroxymethyl)propionic acid", manufactured by Tokyo Chemical Industry Co., Ltd., molecular weight 134], and 18 parts of isophorone diisocyanate [product name "Desmodule I", manufactured by Sumika Covestrourethane Co., Ltd., molecular weight 222]. 7 parts of urethane catalyst "Neostan U-600, manufactured by Nitto Kasei Co., Ltd.", 0.9 parts of gelation inhibitor "Diethyl malonate, manufactured by Tateyama Kasei Co., Ltd.", 1000 parts of toluene and 1000 parts of ethyl acetate were charged together, stirred and mixed under a nitrogen atmosphere, and reacted at 80°C for 10 hours to obtain an electrochemical corrosion protection coating composition (ratio Y-1) containing an ionic polymer (ratio X-1) with a weight-average molecular weight of 30,000 and a concentration of ionized anionic functional group (A) of 0.0 mol / kg.

[0086] <Comparative Example 2> 2000 parts of ethyl acetate were charged into a stainless steel pressure-resistant reaction vessel equipped with a stirrer, thermometer, heating / cooling device, nitrogen inlet tube, and depressurization device. Under stirring, nitrogen was supplied to replace the nitrogen in the reaction vessel (gas phase oxygen concentration of 400 ppm or less). After raising the temperature to 78°C while blowing nitrogen into the system, a solution was prepared by mixing 580 parts of butyl acrylate [product name "butyl acrylate", manufactured by Mitsubishi Chemical Corporation, molecular weight 128], 300 parts of styrene [product name "styrene monomer", manufactured by Asahi Kasei Corporation, molecular weight 104], and 150 parts of acrylic acid [product name "acrylic acid", manufactured by Nippon Shokubai Co., Ltd., molecular weight 72]. 8 parts of dilauroyl peroxide [product name "Perloyl L", manufactured by NOF Corporation, molecular weight 399] were simultaneously added dropwise over 2 hours, and the mixture was stirred at 78°C for 4 hours to carry out the polymerization reaction, yielding an ionic polymer (ratio X-2) with a weight-average molecular weight of 36,000 and a concentration of ionized anionic functional groups (A) of 0.0 mol / kg, which is used for cathodic protection coating composition (ratio Y-2).

[0087] <Examples 1-9, Comparative Examples 1 and 2> For the electrochemical corrosion protection coating compositions (Y) containing the ionic polymer (X) of Examples 1-9 and Comparative Examples 1 and 2, the water content, pH, and halogen content were measured, and the appearance of the coating film, electrochemical corrosion protection, heat and humidity resistance, and rust prevention were evaluated using the following test methods. The results are shown in Table 1.

[0088] [Table 1]

[0089] (1) Evaluation of the appearance of the coating film A stainless steel plate (material: SUS304, 1mm thick x 60mm long x 80mm wide) was immersed in 10% hydrochloric acid in a PP tray for 1 minute. After wiping the surface with paper, it was left to stand for 1 week in a constant temperature and humidity chamber at 40°C and 85% humidity to create a test piece with red rust. The prepared test specimens were coated with the cathodic protection coating compositions described in Examples 1-9 and Comparative Examples 1 and 2 using a squeegee to achieve a coating thickness of 190-210 μm, and then dried overnight. The appearance of the coating after drying was visually evaluated with ○ and × according to the following criteria. ○: No exposure of the test specimen or localized thickness variations are observed in the coating. ×: The coating shows exposure of the test specimen and localized unevenness in thickness.

[0090] (2) Cathodic protection test A stainless steel plate (material: SUS304, 1mm thick x 60mm long x 80mm wide) was immersed in 10% hydrochloric acid in a PP tray for 1 minute. After wiping the surface with paper, it was left to stand for 1 week in a constant temperature and humidity chamber at 40°C and 85% humidity to create a test piece with red rust. The prepared test specimens were coated with the cathodic protection coating compositions described in Examples 1-9 and Comparative Examples 1 and 2 on half of each specimen. Next, a zinc plate was placed on the coated surface via a separator. The uncoated end of the test specimen was connected to the cathode of a battery via a lead wire, and the zinc plate was connected to the anode of the battery via a lead wire. A voltage of 6.16V was applied for one month in a constant temperature and humidity chamber at 30°C and 50% humidity. After standing, the coated surface was removed with acetone solvent, and the degree of red rust removal was visually evaluated on the following four-point scale. ◎: Red rust can be restored to black rust and / or iron at a rate of 95% or more relative to the area. ○: Red rust has a recovery rate of 80% or more but less than 95% of the area to black rust and / or iron. △: Red rust has a recovery rate of 60% or more but less than 80% of the area to black rust and / or iron. ×: Red rust has a recovery rate of less than 60% of the area to black rust and / or iron. The area was measured using an Olympus DSX500 digital microscope, and the restoration rate was calculated as (area of ​​rust before testing - area of ​​rust after testing) / (area of ​​rust before testing) × 100 (%).

[0091] (3) Cathodic protection test after humid and heat resistance test A stainless steel plate (material: SUS304, 1mm thick x 60mm long x 80mm wide) was immersed in 10% hydrochloric acid in a PP tray for 1 minute. After wiping the surface with paper, it was left to stand for 1 week in a constant temperature and humidity chamber at 40°C and 85% humidity to create a test piece with red rust. The prepared test specimens were coated with the cathodic protection coating compositions described in Examples 1-9 and Comparative Examples 1 and 2 on half of each specimen. Next, a zinc plate was placed on the coated surface via a separator. The uncoated end of the test specimen was connected to the cathode of a battery via a lead wire, and the zinc plate was connected to the anode of the battery via a lead wire. A voltage of 6.16V was applied for one day in a constant temperature and humidity chamber at 30°C and 50% humidity, and then the specimens were left to stand for 1000 hours in a constant temperature and humidity chamber at 50°C and 85% humidity. After standing, the coated surface was removed with acetone solvent, and the degree of red rust removal was visually evaluated on the following four-point scale. ◎: Red rust can be restored to black rust and / or iron at a rate of 95% or more relative to the area. ○: Red rust has a recovery rate of 80% or more but less than 95% of the area to black rust and / or iron. △: Red rust has a recovery rate of 60% or more but less than 80% of the area to black rust and / or iron. ×: Red rust has a recovery rate of less than 60% of the area to black rust and / or iron.

[0092] (4) Rust prevention test A stainless steel plate (material: SUS304, 1mm thick x 60mm long x 80mm wide) was polished in accordance with JIS K2246:2018 to create a test specimen. The prepared test specimens were coated with the cathodic protection coating compositions described in Examples 1-9 and Comparative Examples 1 and 2 on half of each specimen. Next, a zinc plate was placed on the coated surface via a separator. The uncoated end of the test specimen was connected to the cathode of a battery via a lead wire, and the zinc plate was connected to the anode of the battery via a lead wire. A voltage of 6.16V was applied for one month in a constant temperature and humidity chamber at 30°C and 50% humidity. After standing, the coated surface was removed with acetone solvent, and the degree of red rust formation was visually evaluated on the following four-point scale. ◎: Red rust is less than 5% of the surface area. ○: Red rust covers 5% or more but less than 20% of the area. △: Red rust covers 20% to less than 40% of the area. ×: Red rust covers more than 40% of the area.

[0093] As can be seen from the results in Table 1, the composition of the present invention exhibits an electrochemical corrosion protection effect on SUS plates that have developed red rust, and also acts as a rust inhibitor. [Industrial applicability]

[0094] The electrochemical corrosion protection coating composition of the present invention functions not only as an electrochemical corrosion protection paint but also as a corrosion protection paint. Furthermore, because it contains an ionic polymer, it has high conductivity and can be used not only as a chemical polishing agent but also as an electrolytic polishing agent. It is also useful as a rust inhibitor and as a primer after various polishing processes.

Claims

1. A cathodic protection coating composition (Y) comprising an ionic polymer (X) having an ionized anionic functional group (A) and a pH of 5 to 9 at 25°C.

2. The cathodic protection coating composition (Y) according to claim 1, wherein the halogen content of the ionic polymer (X) is 20 ppm or less.

3. The cathodic protection coating composition (Y) according to claim 1, wherein the ionized anionic functional group (A) is at least one selected from the group consisting of carboxylic acid anions, phosphate anions, and sulfonate anions.

4. The cathodic protection coating composition (Y) according to claim 1, wherein the counterion of the ionized anionic functional group (A) of the ionic polymer (X) is an amidinium cation and / or a quaternary ammonium cation.

5. The cathodic protection coating composition (Y) according to claim 4, wherein the counterion is 1-ethyl-3-methylimidazolium.

6. An electrochemically protected coating film formed from the electrochemically protected coating composition (Y) according to any one of claims 1 to 5.

7. An electrochemical corrosion protection coating structure in which a conductive coating is laminated on the upper surface of the electrochemical corrosion protection coating according to claim 6.

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