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Austenitic stainless steel pickling passivation paste and pickling passivation process

A technology of austenitic stainless steel and pickling passivation, applied in the coating process of metal materials, etc., can solve problems such as damage, defects, and corrosion of stainless steel equipment or components, and achieve the effect of not being prone to over-corrosion and strengthening passivation

Pending Publication Date: 2020-11-17
安徽笃舜智能装备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the passive film formed by the natural oxidation of stainless steel in the air will inevitably have defects.
At the same time, the oxide film on the surface of stainless steel equipment and components will be damaged during the manufacturing process of forming, assembly, welding, etc., which will greatly reduce the integrity of the passivation film.
Due to the defect or incompleteness of this passivation film, stainless steel equipment or components will still corrode in a corrosive environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A cleaning and passivating agent for austenitic stainless steel, which is composed of the following raw materials in mass percentage: 5% corrosive agent, 40% passivating agent, 1% corrosion inhibitor, 2% penetrating agent, 30% filler, and 22% water.

[0035] The corrosive agent is: citric acid 60%+hydrofluoric acid 40%; the passivator is: citric acid 10%+phosphoric acid 90%; the corrosion inhibitor is: benzotriazole; the The penetrating agent is: fatty alcohol polyoxyethylene ether; the filler is: magnesium nitrate.

[0036] Spray the above-mentioned stainless steel pickling passivation paste on the surface of the treated equipment with a thickness of 1-2mm, keep it at room temperature for 2 hours and then rinse it with clean water.

Embodiment 2

[0038] A cleaning passivator for austenitic stainless steel, which is composed of the following raw materials in mass percentage: 10% corrosive agent, 35% passivator, 2% corrosion inhibitor, 1% penetrating agent, 20% filler, and 32% water.

[0039] Described corrosive agent is: citric acid 60%+acetic acid 40%; Described passivator is: nitric acid 15%+phosphoric acid 85%; Described corrosion inhibitor is: benzotriazole; Described penetration agent is : fatty alcohol polyoxyethylene ether; the filler is: sodium carboxymethyl cellulose.

[0040] Spray the above-mentioned stainless steel pickling passivation paste on the surface of the treated equipment with a thickness of 1-2mm, keep it at room temperature for 2 hours and then rinse it with clean water.

Embodiment 3

[0042] A passivating agent for cleaning austenitic stainless steel, which is composed of the following raw materials in mass percentage: 15% corrosive agent, 30% passivating agent, 2% corrosion inhibitor, 3% penetrating agent, 25% filler, and 25% water.

[0043]The corrosive agent is: citric acid 70%+sulfuric acid 30%; the passivator is: nitric acid 25%+phosphoric acid 75%; the corrosion inhibitor is: benzotriazole 40%+rhodin 60% The penetrating agent is: fatty alcohol polyoxyethylene ether 50% + sodium dodecylbenzene sulfonate 50%; the filler is: sodium carboxymethyl cellulose 20% + bentonite 80%.

[0044] Spray the above-mentioned stainless steel pickling passivation paste on the surface of the treated equipment with a thickness of 1-2mm, keep it at room temperature for 1.5 hours and then rinse it with clean water.

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PUM

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Abstract

The invention discloses austenitic stainless steel pickling passivation paste and a pickling passivation process, and relates to the technical field of stainless steel surface treatment, in particularto the austenitic stainless steel pickling passivation paste and the pickling passivation process. The austenitic stainless steel pickling passivation paste comprise the following raw material components of, in parts by percentage, 5-30 parts of corrosive agent, 10-40 parts of passivator, 1-5 parts of penetrating agent, 1-3 parts of corrosion inhibitor, 20-40 parts of filler and the balance water. The corrosive agent, the passivator, the penetrating agent, the corrosion inhibitor and the filler are mixed together with water according to a specified proportion, the mixture is uniformly stirredand then integrally prepared into pasty paste, and the prepared mixture is the passivation paste. According to the austenitic stainless steel pickling passivation paste and the pickling passivation process, the problem that the integrity of a passivation film is greatly reduced due to the fact that oxide films on the surfaces of stainless steel equipment and parts are damaged in the manufacturingprocesses of forming, assembling, welding and the like of the stainless steel equipment and the parts can be effectively solved, and the situation that due to defects or incompleteness of the passivation film, the stainless steel equipment or the parts can still be corroded in a corrosion environment is avoided.

Description

technical field [0001] The invention relates to the technical field of stainless steel surface treatment, in particular to a pickling passivation technology for austenitic stainless steel equipment or products. Background technique [0002] Stainless steel has good corrosion resistance, high temperature oxidation resistance, good low temperature performance and excellent mechanical and processing properties. Therefore, it is widely used in various fields such as petrochemical industry, aerospace, light industry and textile, food and medicine. In the offshore oil industry, stainless steel, as an excellent seawater corrosion-resistant metal, is more and more widely used in various parts of offshore oil platforms. The corrosion resistance of stainless steel is mainly due to the formation of an extremely thin (about 1nm) dense passivation film on its surface in the air. This layer of passivation film can effectively prevent the further diffusion of corrosive factors such as ox...

Claims

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Application Information

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IPC IPC(8): C23G1/08C23C22/08C23G1/06C23C22/76C23C22/36
CPCC23C22/08C23C22/368C23C22/76C23G1/068C23G1/088
Inventor 岳彩民陈卫国
Owner 安徽笃舜智能装备有限公司
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