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Coating and coated steel

A technology of coatings and mass parts, applied in the direction of epoxy resin coatings, polyurea/polyurethane coatings, coatings, etc., can solve the problems of reduced protective rust function, inability to form protection, unsatisfactory appearance, etc., and achieve excellent corrosion resistance sexual effect

Inactive Publication Date: 2015-04-22
KYOTO MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it takes a long time of about 10 years or more until the above-mentioned protective rust is formed, and loose rust such as red rust and yellow rust may occur due to initial corrosion before the above-mentioned period passes, and flow rust (flowing rust) is not only unsatisfactory in appearance, but also In addition, there are problems such as reduction in plate thickness due to corrosion.
Especially in the environment where sea salt particles are flying, this tendency is remarkable. When the amount of flying salt is large, protective rust may not be formed even after a long period of time.
In addition, if the amount of flying salt is relatively large, the function of protecting the steel from the protective rust may also be reduced.

Method used

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  • Coating and coated steel
  • Coating and coated steel
  • Coating and coated steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] [Preparation of paint]

[0093] Add 0.1 parts by mass of calcium oxide, 0.05 parts by mass of magnesium sulfate, 0.01 parts by mass of sodium benzoate, 10 parts by mass of a texturizing and coloring pigment, and 89.84 parts by mass of vinyl butyral resin so that the viscosity of the paint at 20°C is 200 to 1000 cps Mix with appropriate amount of xylene, toluene and isopropanol to obtain paint. The viscosity of the paint at 20° C. using a B-type viscometer was 500 cps. In addition, the above-mentioned extender and color pigments include barium sulfate and calcium carbonate as extender pigments, iron oxide red, carbon (inorganic pigment), and phthalocyanine blue (organic pigment) as color pigments, each containing equal parts by mass.

[0094] [Production of coated steel materials]

[0095] The surface of a general steel material test piece having a size of 200×100×3.5 mm was derusted by shot blasting. The obtained paint was applied to the surface of the derusted test ...

Embodiment 2～400

[0096] (Examples 2-400 and Comparative Examples 1-20)

[0097] Except having changed the composition of a coating material as described in Tables 4-45, it carried out similarly to Example 1, and obtained the coating material. Furthermore, except having changed the material of the steel material test piece, the pretreatment method, and the thickness of the film as described in Tables 4-45, it carried out similarly to Example 1, and obtained the coated steel material. In addition, the amount of the solvent in the paint is appropriately adjusted so that the viscosity of the paint at 20° C. using a B-type viscometer is 200 to 1000 cps.

[0098] In Tables 4 to 45, the codes in the columns of steel test pieces are described in Table 1, the codes in the column of pretreatment methods are described in Table 2, and the codes in the column of resins are described in Table 3. Table 1 shows the chemical composition of steel materials and the presence or absence of galvanizing. The units...

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Abstract

Provided is a coating which comprises (1) calcium oxide and / or calcium hydroxide, (2) magnesium sulfate, (3) benzoic acid and / or benzoate and (4) resin, and which includes, with respect to 100 parts by mass of the total solid content of the coating, 0.1 to 30 parts by mass of a total of the calcium oxide and calcium hydroxide, 0.05 to 15.0 parts by mass of the magnesium sulfate and 0.01 to 10 parts by mass of a total of the benzoic acid and benzoate.

Description

technical field [0001] The invention relates to a coating and a coated steel material. Background technique [0002] It is generally known that the corrosion resistance of steel is improved when an oxide layer with high environmental barrier properties is formed on the surface of steel. For example, stainless steel forms a passivation film which is an oxide layer with high environmental barrier properties, and exhibits high corrosion resistance. However, stainless steel is used in structures and machinery due to its high price, problems in corrosion resistance such as pitting corrosion due to high-alloy steel, and poor mechanical properties such as strength and toughness compared with low-alloy steel. There are many restrictions. [0003] In addition, the weather-resistant steel obtained by adding a small amount of elements such as P, Cu, Cr, and Ni to the steel forms a protective rust against corrosion (hereinafter referred to as protective rust) outdoors, which can impro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D201/00C09D7/12C09D7/48C09D7/61C09D7/63
CPCC09D7/1233C08K5/101C08K2003/2206C09D5/106C09D5/103C09D7/1216C08K5/09C08K2003/3063C09D7/61C09D7/63C08K3/22C08K3/30C08K3/32C08K3/34C08K5/092C08K5/098C08K13/02C09D129/14C08K2003/3081C08K2003/3045C08K2003/329C09D201/00C09D7/40C08K5/01C09D7/48C09D163/00C09D175/04
Inventor 山下正人野村丰和
Owner KYOTO MATERIALS