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Repair agent and repair method for plated base, as well as plated base

A repairing method and repairing agent technology are applied in the field of plating substrates and repairing agents for plating substrates, which can solve problems such as inability to obtain corrosion resistance, and achieve excellent sacrificial corrosion resistance, excellent protective film forming ability, and sufficient The effect of corrosion resistance

Inactive Publication Date: 2018-03-06
HIROSHIMA UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] After the inventors of the present invention tried to add a repair agent to the protective film, they discovered a new problem: adding any compound with a single component cannot obtain sufficient corrosion resistance

Method used

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  • Repair agent and repair method for plated base, as well as plated base
  • Repair agent and repair method for plated base, as well as plated base
  • Repair agent and repair method for plated base, as well as plated base

Examples

Experimental program
Comparison scheme
Effect test

Embodiment A1

[0073] exist Figure 5 In the apparatus 50 shown, a carbon steel sheet (high tension material) (12 mm×12 mm) (content ratio: carbon 0.5 wt %, silicon 0.02 wt %, manganese 0.2 wt %, phosphorus 0.1 wt %, sulfur 0.1 wt %, The remaining part is iron) as the working electrode 51, which was immersed in the air-saturated test solution (35°C) 52 for 24 hours, and the spontaneous potential was measured. The test solution was prepared by dissolving sodium dihydrogen phosphate, ATMP and zinc sulfate as repairing agents in an aqueous sodium salt solution. The sodium salt concentration was 0.5% by weight, the sodium dihydrogen phosphate concentration was 500 ppm, the ATMP concentration was 500 ppm, and the zinc sulfate concentration was 500 ppm. The pH of the test solution was adjusted to 6.2 with NaOH / HCl. The counter electrode 53 is a platinum electrode, and the reference electrode 54 is an Ag / AgCl electrode.

[0074] Then, while the working electrode 51 was immersed in the test solut...

Embodiment A2

[0100] Cathodic polarization was performed in the same manner as in Example A1, except that the concentration of sodium salt used as the test solution was set to 3.5% by weight. The protective film on the surface of the cathodically polarized working electrode was used for thermogravimetric analysis (TG). The results are shown in Figure 13 .

Embodiment B1～B10 and comparative example B1～B6

[0105] The cathode current value was measured by the same method as Example A1 except that the predetermined compound was dissolved in the test liquid in a predetermined amount, and the current inhibition rate E was calculated. The kinds and amounts of compounds in each Example / Comparative Example are shown in the following table.

[0106] The current suppression ratio E was graded according to the following method.

[0107] (-0.8V)

[0108] S: E = more than 85%;

[0109] A: E = more than 80%;

[0110] B: E=75% or more;

[0111] C: E=70% or more (no problem in use);

[0112] D: E=less than 70% (no problem in use).

[0113] (-1.2V)

[0114] S: E = more than 91%;

[0115] A: E=88% or more;

[0116] B: E=85% or more;

[0117] C: E=76% or more (no problem in use);

[0118] D: E=less than 76% (no problem in use).

[0119] 【table 5】

[0120]

[0121]

[0122] Each amount shown in (2) is a ratio with respect to the total amount of sodium dihydrogen phosphate, ATMP, ...

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PUM

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Abstract

The invention provides a repair agent and repair method for a plated base, as well as a plated base. Disclosed is a repair agent for a plated base including a plating layer which is disposed on a surface of a metal base and which includes a metal with a stronger tendency to ionization than metal comprising the metal base, the repair agent including a phosphoric acid compound and a phosphonic acidcompound.

Description

technical field [0001] The present invention relates to a repairing agent for a plating substrate having a plating layer on the surface of a metal substrate, a repairing method for the plating substrate, and a plating substrate. Background technique [0002] For automotive parts, zinc-coated steel sheets are generally used, in which a zinc-coated layer is formed on the surface of a steel sheet. The zinc contained in the zinc coating exhibits a higher ionization tendency than the iron contained in the steel sheet. Therefore, when a scratch (scratch) occurs on the zinc coating and the steel sheet is exposed, the zinc coating has sacrificial corrosion protection (sacrifical protection) properties brought about by zinc elution and the ability of the dissolved zinc to form a thin film on the surface of the exposed steel sheet. Protects the ability to form a thin film, thereby self-healing and exhibiting corrosion resistance. However, conventional zinc-coated steel sheets cannot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/08
CPCC23F11/08C23C22/68C25D3/22C25D5/36C25D3/00C23C22/22
Inventor 矢吹彰广绵引将人藤原隆志山根贵和三村治
Owner HIROSHIMA UNIVERSITY
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