A corrosion inhibition composition suitable for copper-aluminum composite materials

Abstract

The invention discloses a corrosion inhibition composition suitable for copper-aluminum composite materials, which is composed of acylsarcosine and carbonate-type quaternary ammonium salt; the mixing mass ratio of the acylsarcosine and carbonate-type quaternary ammonium salt is 3-4.5:1-1.5. Adding the corrosion inhibition composition of the invention to cutting fluid can solve the galvanic corrosion problem of the copper-aluminum composite materials; the oleoylsarcosine and didecyl dimethyl carbonate quaternary ammonium salt in the composition can form a passivation film on the metal surface of the copper-aluminum composite material to reduce the copper-aluminum bimetallic galvanic cell effect, and can also form a dense hydrophobic film that can isolate dust and acidic gases in the air, thereby protecting the copper-aluminum composite material from aluminum corrosion during processing and copper corrosion during process flow; the composition of the invention is applied to emulsified cutting fluid, so that the protection period of the copper-aluminum composite material can reach more than 15 days.

Description

Technical Field

[0001] The invention relates to a corrosion inhibition composition suitable for copper-aluminum composite materials. Background Art

[0002] Aluminum alloy is a non-ferrous light metal. Because its specific gravity is equivalent to one-third of that of steel, and it has excellent physical, mechanical and corrosion resistance, and is easy to process and produce, aluminum alloy has broad application prospects in machinery manufacturing, transportation, chemical packaging, and daily necessities. Copper alloy has excellent electrical conductivity, thermal conductivity and ductility, and is widely used in generators, cables and other industries. With the lightweight demand of original equipment manufacturers (OEMs) in the automotive industry and the rapid development of new energy vehicles in recent years, more copper-aluminum composite materials are used, such as the manufacture of positive and negative electrodes of batteries, battery water cooling plates, etc. The potential of copper is higher than that of aluminum. After the two are welded and composited, it is easy to form a primary battery, which is very prone to galvanic corrosion. The primary battery effect of copper-aluminum composite materials in machining cutting fluid is: aluminum is the anode and copper is the cathode, which makes aluminum corrode faster than copper. When it circulates in the air between processes, a dense oxide film is formed on the surface of aluminum, and the potential increases. At this time, aluminum is the cathode and copper is the anode, which accelerates the corrosion of copper in the composite material. The prior art commonly uses benzotriazole, methylbenzotriazole and its derivatives, phosphate esters, and siloxane ketones as aluminum and copper corrosion inhibitors, respectively. However, the above corrosion inhibitor additives cannot solve the galvanic corrosion problem of copper-aluminum composite materials, especially the copper corrosion problem of long-term circulation between processing steps. Summary of the invention

[0003] Purpose of the invention: The purpose of the present invention is to provide a corrosion inhibition composition suitable for copper-aluminum composite materials, which can solve the problems of aluminum corrosion of copper-aluminum composite materials during cutting fluid processing and copper corrosion during inter-process transfer, and the protection period of copper-aluminum composite materials can reach more than 15 days.

[0004] Technical solution: The corrosion inhibition composition suitable for copper-aluminum composite materials described in the present invention is composed of acyl sarcosine and carbonate-type quaternary ammonium salt.

[0005] Wherein, the mixing mass ratio of the acyl sarcosine to the carbonate type quaternary ammonium salt is 3-4.5:1-1.5.

[0006] Wherein, the acyl sarcosine is lauroyl sarcosine or oleoyl sarcosine, preferably oleoyl sarcosine.

[0007] Wherein, the carbonate-type quaternary ammonium salt is didecyl dimethyl carbonate quaternary ammonium salt, dioctyl dimethyl carbonate quaternary ammonium salt or dinonyl dimethyl carbonate quaternary ammonium salt; preferably didecyl dimethyl carbonate quaternary ammonium salt, selected from Swiss Lonza 1000.

[0008] Wherein, the structural formula of the didecyl dimethyl carbonate quaternary ammonium salt is:

[0009]

[0010] The corrosion inhibition composition is used as a corrosion inhibition additive for cutting fluid.

[0011] Wherein, the amount of the corrosion inhibition composition added to the cutting fluid is 2-6% of the mass of the cutting fluid.

[0012] In the corrosion inhibition composition of the present invention, the quaternary ammonium didecyl dimethyl carbonate can be used as a copper-aluminum corrosion inhibitor, that is, it can have good adsorption film-forming performance on copper and also have good adsorption film-forming performance on aluminum, so it can form an anodic passivation film on the surfaces of both copper and aluminum metals, the passivation film increases the corrosion potential, reduces the potential difference of the copper-aluminum composite material, thereby solving the aluminum corrosion problem caused by the galvanic cell effect in the processing process; at the same time, the oleoylsarcosine molecular structure in the composition has two polar adsorption groups, an amide group and a carboxylic acid, and the multi-point adsorption effect enables the oleoylsarcosine molecules to be firmly adsorbed on the copper-aluminum metal surface to form a dense hydrophobic film, and the hydrophobic effect of the C16-C18 long alkyl carbon chain can effectively shield the metal, thereby forming a complete hydrophobic isolation film, isolating dust impurities and acidic gases in the air from corroding the copper surface, thereby solving the copper corrosion problem caused by the galvanic cell effect in the process flow.

[0013] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: adding the corrosion inhibition composition of the present invention to the cutting fluid can solve the galvanic corrosion problem of the copper-aluminum composite material; the oleoylsarcosine and didecyldimethyl carbonate quaternary ammonium salt in the composition can form a passivation film on the metal surface of the copper-aluminum composite material to reduce the copper-aluminum bimetallic galvanic cell effect, and can also form a dense hydrophobic film that can isolate dust and acidic gases in the air, thereby protecting the copper-aluminum composite material from aluminum corrosion during processing and copper corrosion during process flow; applying the composition of the present invention to an emulsified cutting fluid can make the protection period of the copper-aluminum composite material reach more than 15 days. DETAILED DESCRIPTION

[0014] Example 1

[0015] The cutting fluid containing the corrosion inhibition composition of the present invention is composed of the following components by mass fraction: 15% of emulsified oil compound (commercial model Lubrizol 5477), 74% of 22# cycloalkyl base oil, 3% of oleyl sarcosine, quaternary ammonium salt of didecyl dimethyl carbonate (commercial model 1000) 1%, tall oil 2% and water 5%.

[0016] Example 2

[0017] The cutting fluid containing the corrosion inhibition composition of the present invention is composed of the following components by mass fraction: 15% of emulsified oil compound (commercial model Lubrizol 5477), 76% of 22# cycloalkyl base oil, 1.5% of oleyl sarcosine, quaternary ammonium salt of didecyl dimethyl carbonate (commercial model 1000) 0.5%, tall oil 2% and water 5%.

[0018] Example 3

[0019] The cutting fluid containing the corrosion inhibition composition of the present invention is composed of the following components by mass fraction: 15% of emulsified oil compound (commercial model Lubrizol 5477), 74% of 22# cycloalkyl base oil, 3% of lauroyl sarcosine, quaternary ammonium salt of didecyl dimethyl carbonate (commercial model 1000) 1%, tall oil 2% and water 5%.

[0020] Example 4

[0021] The cutting fluid containing the corrosion inhibition composition of the present invention is composed of the following components by mass fraction: an emulsifier composition (tall oil acid amide: 10%, tetrapolyricinoleic acid: 4%, isomeric tridecanol ether carboxylic acid: 1%), 22# cycloalkyl base oil 74%, oleyl sarcosine 3%, didecyl dimethyl carbonate quaternary ammonium salt (product model 1000) 1%, tall oil 2% and water 5%.

[0022] Example 5

[0023] The cutting fluid containing the corrosion inhibition composition of the present invention is composed of the following components by mass fraction: an emulsifier composition (polyisobutylene succinic acid amine salt: 12%, oleyl alcohol polyoxyethylene ether: 2%), 22# cycloalkyl base oil 75%, oleyl sarcosine 3%, didecyl dimethyl carbonate quaternary ammonium salt (product model 1000) 1%, tall oil 2% and water 5%.

[0024] Comparative Example 1

[0025] A cutting fluid containing a corrosion inhibition composition, comprising the following components by mass fraction: 15% of an emulsified oil compound (commercial model Lubrizol 5477), 76.5% of a 22# cycloalkyl base oil, 1% of oleyl sarcosine, and quaternary ammonium salt of didecyl dimethyl carbonate (commercial model 1000) 0.5%, tall oil 2% and water 5%.

[0026] Comparative Example 2

[0027] A cutting fluid containing a corrosion inhibition composition, comprising the following components by mass fraction: 15% of an emulsified oil compound (commercial model Lubrizol 5477), 74% of a 22# cycloalkyl base oil, 1% of oleyl sarcosine, and quaternary ammonium salt of didecyl dimethyl carbonate (commercial model 1000) 3%, tall oil 2% and water 5%.

[0028] Comparative Example 3

[0029] A cutting fluid containing a corrosion inhibitor, comprising the following components by mass fraction: 15% of an emulsified oil compound (commercial model Lubrizol 5477), 73% of a 22# cycloalkyl base oil, and quaternary ammonium salt of didecyl dimethyl carbonate (commercial model 1000) 3%, tall oil 4% and water 5%.

[0030] Comparative Example 4

[0031] A cutting fluid containing a corrosion inhibitor is composed of the following components in mass fractions: 15% of an emulsified oil compound (commercial model Lubrizol 5477), 75% of 22# cycloalkyl base oil, 3% of oleoyl sarcosine, 2% of tall oil and 5% of water.

[0032] Comparative Example 5

[0033] A cutting fluid containing a corrosion inhibitor is composed of the following components by mass fraction: 15% of an emulsified oil compound (commercial model Lubrizol 5477), 74% of 22# naphthenic base oil, 3% of phosphate ester MDIT, 1% of methyl benzotriazole, 2% of tall oil and 5% of water.

[0034] Test method:

[0035] Test method 1: Test the copper-aluminum composite material specimens for corrosion according to GBT6144 national standard 5.6 corrosion test method. Immerse the test piece for 48 hours, observe the corrosion of the copper and aluminum surfaces, and make a rating.

[0036] Test method 2: According to GBT6144 national standard, grind the copper-aluminum composite material test piece, soak it in the test liquid for 3-5 minutes, take it out, place it in a constant temperature (35℃) and constant humidity (90% humidity) box to observe the corrosion of the test piece, and record the corrosion cycle (days). This method evaluates the corrosion of copper-aluminum composite materials after cutting fluid processing.

[0037] Table 1

[0038]

[0039] In the corrosion test of GBT6144 national standard method, the copper of the composite material is the cathode, the aluminum is the anode, and the aluminum corrodes rapidly; in the corrosion test of test method 2, the copper of the composite material is the anode, the aluminum is the cathode, and the copper corrodes rapidly.

[0040] It can be seen from Examples 1 to 3 that oleoylsarcosine The composition 1000 exhibits excellent corrosion inhibition performance under both galvanic cell corrosion conditions. The composition forms a passivation film on the metal surface of the copper-aluminum composite material to reduce the copper-aluminum bimetallic galvanic cell effect, and forms a dense hydrophobic film that can isolate dust and acidic gases in the air, thereby protecting the copper-aluminum composite material from aluminum corrosion during processing and copper corrosion during process flow. Example 3: Since the alkyl carbon chain of lauroyl sarcosine is a medium chain, the shielding effect is slightly poor and the corrosion inhibition effect is slightly weak.

[0041] It can be seen from Examples 4 to 5 that oleoylsarcosine The 1000 composition still exhibits excellent corrosion inhibition effect in cutting fluids of different emulsification systems, which can solve the corrosion problem of copper and aluminum materials during cutting fluid processing, and can also solve the corrosion problem between process steps after processing.

[0042] Comparative Examples 1 to 4 show that oleoyl sarcosine and When the composition 1000 is used alone or the compounding ratio is not correct, the corrosion inhibition performance of the copper-aluminum composite material will decrease. 1000 adsorbs and passivates the metal surface, but the alkyl chain is short and has poor resistance to corrosive media. Comparative Example 4 uses oleoylsarcosine alone, which is a cathode adsorption inhibitor. It cannot change the corrosion potential formed by the copper-aluminum composite material, and the corrosion is still uncontrollable. Comparative Examples 1-2 adjust the compounding ratio of the corrosion inhibition composition. Due to the steric hindrance effect of the two organic alkyl chains in the composition, the corrosion inhibition performance is reduced. Comparative Example 5 uses traditional phosphate esters and benzotriazole to compound. Under the conditions that copper is the cathode and aluminum is the anode, it can protect the composite material well; but under the conditions that copper is the anode and aluminum is the cathode during the process, the corrosion is accelerated. This is because although benzotriazole can form an adsorption layer on the copper-based surface, due to the lack of hydrophobic alkyl chains and the primary battery effect of the composite material, the copper-based surface still corrodes rapidly. The same problem exists in commercially available phosphorus-containing cutting fluids.

Claims

1. A corrosion inhibition composition suitable for copper-aluminum composite materials, characterized in that: It is composed of acyl sarcosine and carbonate-type quaternary ammonium salt.

2. The corrosion inhibition composition according to claim 1, characterized in that: The mixing mass ratio of the acyl sarcosine to the carbonate type quaternary ammonium salt is 3-4.5:1-1.

5.

3. The corrosion inhibition composition according to claim 2, characterized in that: The acyl sarcosine is lauroyl sarcosine or oleoyl sarcosine.

4. The corrosion inhibition composition according to claim 2, characterized in that: The carbonate-type quaternary ammonium salt is didecyl dimethyl carbonate quaternary ammonium salt, dioctyl dimethyl carbonate quaternary ammonium salt or dinonyl dimethyl carbonate quaternary ammonium salt.

5. The corrosion inhibition composition according to claim 4, characterized in that: The structural formula of the didecyl dimethyl carbonate quaternary ammonium salt is:

6. Use of the corrosion inhibition composition according to claim 1 as a corrosion inhibition additive for cutting fluid.

7. The use according to claim 6, characterized in that: In the cutting fluid, the amount of the corrosion inhibition composition added is not less than 2% of the mass of the cutting fluid.

8. The use according to claim 7, characterized in that: In the cutting fluid, the amount of the corrosion inhibition composition added is 2-6% of the mass of the cutting fluid.

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