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TiZr conversion coating/organic coating double-layered prevention method applied to steel fasteners

An organic coating and fastener technology, which is applied in the field of organic coating double-layer protection, can solve the problem of inability to meet steel fasteners, etc., and achieve good resistance to neutral salt spray, good wear resistance, and good corrosion resistance. Effect

Inactive Publication Date: 2013-04-03
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the current surface protection methods such as electroplating, chemical plating, and composite coating, which cannot meet the problems of the application of steel fasteners in relatively harsh environments, the purpose of the present invention is to provide a titanium-zirconium conversion method for steel fasteners. The method of double-layer protection of film / organic coating adopts the surface treatment technology of titanium-zirconium conversion film / organic coating double-layer protection, which solves the restrictions on the application of steel fasteners, and ensures that the coating is thin (≤15μm ), when the bonding strength with the substrate is high, the neutral salt spray corrosion resistance of the coating is greatly improved and the wear resistance of the coating is improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] First, prepare the samples, degrease the steel fasteners in an alkaline degreasing solution, then wash them with a large amount of water, then derust them in an acidic descaling solution, wash and dry them with a large amount of water.

[0029] The degreasing liquid is composed of sodium hydroxide, sodium carbonate, trisodium phosphate, sodium silicate, and OP-10 emulsifier. The contents of each component are as follows:

[0030] Sodium hydroxide 10g / L; sodium carbonate 20g / L; trisodium phosphate 50g / L; sodium silicate 5g / L; OP-10 emulsifier 0.2g / L; the rest is water.

[0031] Rust removal solution is made by mixing hydrochloric acid and nitric acid, and the content of each component is as follows:

[0032] Hydrochloric acid 5g / L; nitric acid 15g / L; the rest is water.

[0033] Then, take 15g of fluozirconic acid; 20g of fluotitanic acid; 25g of hydrofluoric acid; 8g of nitric acid; 4g of tannic acid; 3g of aminotrimethylene phosphonic acid (ATMP); / zirconium conversi...

Embodiment 2

[0040] First, prepare the samples, degrease the steel fasteners in an alkaline degreasing solution, then wash them with a large amount of water, then derust them in an acidic descaling solution, wash and dry them with a large amount of water.

[0041] The degreasing liquid is composed of sodium hydroxide, sodium carbonate, trisodium phosphate, sodium silicate, and OP-10 emulsifier. The contents of each component are as follows:

[0042] Sodium hydroxide 12g / L; sodium carbonate 60g / L; trisodium phosphate 70g / L; sodium silicate 10g / L; OP-10 emulsifier 2g / L; the rest is water.

[0043] Rust removal solution is made by mixing hydrochloric acid and nitric acid, and the content of each component is as follows:

[0044] Hydrochloric acid 2g / L; nitric acid 20g / L; the rest is water.

[0045] Then, take 17g of fluozirconic acid; 23g of fluotitanic acid; 20g of hydrofluoric acid; 10g of nitric acid; 2g of tannic acid; 5g of aminotrimethylene phosphonic acid (ATMP); / zirconium conversi...

Embodiment 3

[0052] First, prepare the samples, degrease the steel fasteners in an alkaline degreasing solution, then wash them with a large amount of water, then derust them in an acidic descaling solution, wash and dry them with a large amount of water.

[0053] The degreasing liquid is composed of sodium hydroxide, sodium carbonate, trisodium phosphate, sodium silicate, and OP-10 emulsifier. The contents of each component are as follows:

[0054] Sodium hydroxide 10g / L; sodium carbonate 50g / L; trisodium phosphate 60g / L; sodium silicate 7g / L; OP-10 emulsifier 3g / L; the rest is water.

[0055] Rust removal solution is made by mixing hydrochloric acid and nitric acid, and the content of each component is as follows:

[0056] Hydrochloric acid 10g / L; nitric acid 10g / L; the rest is water.

[0057] Then, take 20g of fluozirconic acid; 15g of fluotitanic acid; 19g of hydrofluoric acid; 6g of nitric acid; 5g of tannic acid; 7g of aminotrimethylene phosphonic acid (ATMP); / zirconium conversio...

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Abstract

The invention relates to the surface prevention technology of steel fasteners, in particular to a TiZr conversion coating / organic coating double-layered prevention method applied to the steel fasteners, and aims to solve the problems of poor anticorrosion performance and serious pollution of surface protection of a plurality of single-layered or composite electroplated, chemically plated or organic coatings. The method comprises the following steps: deoiling and derusting the fasteners; soaking the steel fasteners in diluted Ti / Zr conversion liquid for 2 to 10 min to generate a layer of Ti / Zr conversion coating; carrying out water washing; and coating a layer of organic coating material, so as to form an organic coating. Through the adoption of the TiZr conversion coating / organic coating double-layered surface prevention technology, the problem that the fasteners are poor in corrosion resistance and seriously polluted under relatively harsh marine environment is solved; and under the premise that the thinness of coating is smaller than and equal to 15 Mum and the basal body bonding strength is high, the neutral salt mist corrosion resistance and the wear resistance of the coating are improved to a large extent.

Description

technical field [0001] The invention relates to the surface protection technology of iron and steel fasteners, in particular to a method for double-layer protection of titanium-zirconium conversion film / organic coating applied to iron and steel fasteners. Background technique [0002] The marine environment is one of the most corrosive environments in nature, and most metal materials are not resistant to seawater, ocean and atmospheric corrosion. Many threaded fasteners exposed to the marine environment for a long time have very serious corrosion. Corrosion makes it difficult to disassemble the fasteners, reduce the connection strength, or even lose them, which causes great difficulties for the normal service and maintenance of the fasteners, and Fasteners have size issues and cannot be protected with thicker coatings. [0003] Through the analysis of fastener materials, structural characteristics, service conditions and other factors, combined with the corrosion characteri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/34B05D7/14
Inventor 李庆鹏管勇刘建国严川伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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