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Stainless steel passivation liquid and passivation technology thereof

A technology of stainless steel and passivation solution, applied in the direction of metal material coating process, etc., can solve the problems of strong corrosiveness, easy pollution and danger, corrosion of stainless steel through grains, incalculable damage to human body, etc., to achieve passivation The effect of good effect, low production cost and easy operation

Inactive Publication Date: 2017-07-11
合肥协耀玻璃制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The passivation solutions commonly used in pickling passivation methods include nitric acid, sulfuric acid, hydrofluoric acid, etc. Although the passivation effect of this type of passivation solution is good, it is extremely corrosive, easy to pollute and dangerous. It will cause different degrees of corrosion such as pitting corrosion, needle corrosion, intergranular corrosion, and transgranular corrosion on stainless steel parts. Some of these corrosion points are the direct source of material fracture, and some are catalysts for material fracture.
In addition, its danger is manifested in that they can react violently with various substances such as metal powder, calcium carbide, turpentine, etc., and cause an explosion. In addition, nitric acid is easily contacted with combustibles, reducing agents and organic substances such as wood chips, cotton, straw or waste sand. It causes combustion and emits highly toxic brown smoke, which is not only inconvenient to use in stainless steel processing, but also incalculable damage to the human body. Therefore, current research is more on passivation technology based on the premise of environmental protection, safety and simplicity. There is also an urgent need for a safe passivation solution with good passivation effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. Components of passivation solution

[0030] A stainless steel passivation solution, in parts by weight, comprising the following components: 40 parts of inorganic acid, 5 parts of hydrogen peroxide, 8 parts of cyclohexanol, 4 parts of epoxy octyl stearate, 4 parts of acetic anhydride, polyethylene 2 parts of imine, 3 parts of carbo resin, 2 parts of penetrating agent, 1 part of corrosion inhibitor, 10 parts of organic filler.

[0031] Wherein, the inorganic acid is a mixture of formic acid and phosphoric acid in equal amounts.

[0032] Wherein, the penetrating agent is ethylenediamine EO-PO.

[0033] Wherein, the corrosion inhibitor is a mixture of sodium molybdate, sodium metasilicate and p-thiocresol, and the mass ratio between them is 1:1:2.

[0034] Wherein, the organic filler is a mixture of sodium nitrate and barium sulfate in equal amounts.

[0035] 2. Passivation process

[0036] Follow the steps below:

[0037] (1) Polishing and derusting: use sandpaper...

Embodiment 2

[0045] 1. Components of passivation solution

[0046] A stainless steel passivation solution, in parts by weight, comprising the following components: 45 parts of inorganic acid, 10 parts of hydrogen peroxide, 10 parts of cyclohexanol, 6 parts of epoxy octyl stearate, 5 parts of acetic anhydride, polyethylene 3 parts of imine, 4 parts of carbo resin, 3 parts of penetrant, 2 parts of corrosion inhibitor, 15 parts of organic filler.

[0047] Wherein, the inorganic acid is a mixture of three equal amounts of oxalic acid, formic acid and phosphoric acid.

[0048] Wherein, the penetrating agent is ethylenediamine EO-PO.

[0049] Wherein, the corrosion inhibitor is a mixture of sodium metasilicate, sodium borate and p-thiocresol in equal amounts.

[0050] Wherein, the organic filler is a mixture of sodium nitrate, magnesium phosphate and barium sulfate in equal amounts.

[0051] 2. Passivation process

[0052] Follow the steps below:

[0053] (1) Polishing and derusting: use sa...

Embodiment 3

[0061] 1. Components of passivation solution

[0062] A stainless steel passivation solution, in parts by weight, comprising the following components: 50 parts of inorganic acid, 15 parts of hydrogen peroxide, 12 parts of cyclohexanol, 8 parts of epoxy octyl stearate, 6 parts of acetic anhydride, polyethylene 4 parts of imine, 5 parts of carbo resin, 4 parts of penetrant, 3 parts of corrosion inhibitor, 20 parts of organic filler.

[0063] Wherein, the inorganic acid is a mixture of oxalic acid and phosphoric acid in equal amounts.

[0064] Wherein, the penetrating agent is ethylenediamine EO-PO.

[0065] Wherein, the corrosion inhibitor is a mixture of sodium molybdate and sodium metasilicate in equal amounts.

[0066] Wherein, the organic filler is a mixture of sodium nitrate, magnesium phosphate and barium sulfate in equal amounts.

[0067] 2. Passivation process

[0068] Follow the steps below:

[0069] (1) Polishing and derusting: use sandpaper or grinder to polish a...

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PUM

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Abstract

The invention discloses stainless steel passivation liquid and a passivation technology thereof. The stainless steel passivation liquid comprises, by weight, 40-50 parts of inorganic acid, 5-15 parts of hydrogen peroxide, 8-12 parts of cyclohexanol, 4-8 parts of 2-ethylhexyl epoxystearate, 4-6 parts of acetic anhydride, 2-4 parts of polyethyleneimine, 3-5 parts of carbomer resin, 2-4 parts of a penetrating agent, 1-3 parts of corrosion inhibitor and 10-20 parts of organic filler. The passivation technology of the stainless steel passivation liquid comprises polishing and rust removal, surface oil removal, first-time water washing, sand blasting, acid pickling passivation, second-time water washing and surface drying. The stainless steel passivation liquid is little in perniciousness, good in passivation effect and not prone to generating corrosive damage on a stainless steel product. The passivation technology is simple, operation is easy, the production cost is low, pollution to the environment is weak, and the standard of green and environment friendliness is met.

Description

technical field [0001] The invention relates to the field of stainless steel processing, in particular to a stainless steel passivation solution and a passivation process thereof. Background technique [0002] After stainless steel products are processed, most products need to be pickled and passivated to ensure the corrosion resistance of stainless steel products. [0003] Stainless steel has good corrosion resistance, high temperature oxidation resistance, good low temperature resistance and excellent mechanical and processability, so it is widely used in chemical industry, petroleum, power, nuclear engineering, aerospace, ocean, medicine, light industry, textile and other fields. Corrosion resistance is the most important feature of stainless steel. In addition to the difference in material itself, its performance mainly depends on the quality of the passivation film formed on the surface of stainless steel. If the film is incomplete or defective, stainless steel will st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/47C23C22/46C23C22/42C23C22/08C23C22/50C23C22/73C23C22/78C23G1/08C23G1/04C23G1/06
CPCC23C22/47C23C22/08C23C22/42C23C22/46C23C22/50C23C22/73C23C22/78C23G1/04C23G1/068C23G1/083C23G1/088
Inventor 魏芳芳
Owner 合肥协耀玻璃制品有限公司
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