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Pickling and passivating combined solution for titanium material anodizing treatment and pickling and passivating method

A technology of pickling passivation and combined liquid, which is applied in the direction of electrolytic coating, surface reaction electrolytic coating, coating, etc., and can solve problems such as HF volatilization, environmental hazards, and acid accumulation

Inactive Publication Date: 2020-10-27
SHANGHAI INST OF SPECIAL EQUIP INSPECTION & TECHN RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, nitric acid + hydrofluoric acid is generally used for surface pickling, but HNO 3 Both HF and HF are strong acids with strong corrosiveness, which are extremely harmful to equipment and human body, and the following situations are easily produced during pickling: (1) Over-corrosion of titanium equipment; (2) HF volatilization; ( 3) Accumulation of acid solution in storage acid tank; (4) HNO after HF acid ratio imbalance 3 and HF can be hazardous to the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A pickling and passivation combination solution for anodizing treatment of titanium materials, the pickling and passivation combination solution includes pretreatment chemical degreasing solution, pickling solution, oxalate treatment solution and anodic oxidation solution, anodic oxidation solution It is a thick film anodizing solution, wherein the pretreatment chemical degreasing solution includes the following components: NaOH 30g / L, NaOH 2 CO 3 20g / L, Na 3 PO 4 20g / L, nonionic surfactant (polyoxyethylene type) 1g / L, Na 2 O nSiO 2 3g / L, the balance is water; the pickling solution includes the following components in mass percentage: HNO 3 21%, HCl 9%, and the balance is water; the oxalate treatment solution includes the following components: H 2 C 2 o 4 30g / L, NaHSO 3 3g / L, Na 2 S 2 o 3 1g / L, the balance is water; the thick film anodizing solution includes the following components: H 2 SO 4 350g / L, HCl 55g / L, and the balance is water.

[0033] A kind...

Embodiment 2

[0044] A pickling and passivation combination solution for anodizing treatment of titanium materials, the pickling and passivation combination solution includes pretreatment chemical degreasing solution, pickling solution, oxalate treatment solution and anodic oxidation solution, anodic oxidation solution It is a thick film anodizing solution, wherein the pretreatment chemical degreasing solution includes the following components: NaOH 40g / L, NaOH 2 CO 3 30g / L, Na 3 PO 4 25g / L, non-ionic surfactant (using polyol type) 3g / L, Na 2 O nSiO 2 5g / L, the balance is water; the pickling solution includes the following components in mass percentage: HNO 3 25%, HCl 7%, and the balance is water; the oxalate treatment solution includes the following components: H 2 C 2 o 4 40g / L, NaHSO 3 4g / L, Na 2 S 2 o 3 2g / L, the balance is water; the thick film anodizing solution includes the following components: H 2 SO 4 400g / L, HCl 65g / L, and the balance is water.

[0045] A kin...

Embodiment 3

[0056] A pickling and passivation combination solution for anodizing treatment of titanium materials, the pickling and passivation combination solution includes pretreatment chemical degreasing solution, pickling solution, oxalate treatment solution and anodic oxidation solution, anodic oxidation solution For colored anodizing solution, wherein, the pretreatment chemical degreasing solution includes the following components: NaOH 40g / L, NaOH 2 CO 3 30g / L, Na 3 PO 4 25g / L, nonionic surfactant (alkanolamide type) 3g / L, Na 2 O nSiO 2 5g / L, the balance is water; the pickling solution includes the following components: HNO 3 25%, HCl 12.5%, and the balance is water; the oxalate treatment solution includes the following components: H 2 C 2 o 4 40g / L, NaHSO 3 4g / L, Na 2 S 2 o 3 2g / L, the balance is water; the colored anodizing solution includes the following components: chromic anhydride 120g / L, boric acid 3g / L, and the balance is water.

[0057] A kind of pickling ...

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Abstract

The invention relates to a pickling and passivating combined solution for titanium material anodizing treatment and a pickling and passivating method. The pickling and passivating combined solution comprises a pretreatment chemical degreasing solution, a pickling solution, an oxalate treatment solution and an anodic oxidation solution; the pretreatment chemical degreasing solution is prepared fromthe following components of, 30g / L-40g / L of NaOH, 20g / L-30g / L of Na2CO3, 20g / L-25g / L of Na3PO4, 1g / L-3g / L of a nonionic surfactant, 3g / L-5g / L of Na2O. nSiO2 and the balance water; the pickling solution is prepared from the following components of, in percentage by mass, 15%-25% of HNO3, 5%-15% of HCl and the balance water; the oxalate treating solution is prepared from the following components of, 30g / L-40g / L of H2C2O4, 3g / L-4g / L of NaHSO3, 1g / L-2g / L of Na2S2O3 and the balance water; and the anodic oxidation liquid is selected from one or more of thick-film anodic oxidation solution and colored anodic oxidation solution. Compared with the prior art, two kinds of volatile acid including nitric acid and hydrofluoric acid are prevented from being adopted, thus, corrosion of a pickling tank and manual damage caused by formation of local concentrated acid are avoided, the process cost is low, and the problem of a titanium material in the pickling cation treatment process is effectively solved.

Description

technical field [0001] The invention belongs to the technical field of corrosion and protection, and in particular relates to a pickling passivation combination solution and a pickling passivation method for anodizing treatment of titanium materials. Background technique [0002] Titanium, as a highly chemically active metal, exhibits particularly excellent corrosion resistance to many corrosive media, but titanium has a large friction coefficient and high chemical activity, and the surface of titanium is easily scratched during the manufacturing and testing process Or pollution, if the surface of titanium is polluted by copper or iron, corrosion will occur. Among them, iron pollution on the surface of titanium will provide a powerful channel for hydrogen to diffuse to titanium, resulting in hydrogen embrittlement. Therefore, in the process of manufacturing titanium pressure vessels, the final treatment of titanium is often pickling to remove iron ions. [0003] In the prio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/26C23G1/10
CPCC25D11/26C23G1/106
Inventor 丁菊刘书宏张蒲根朱旭晨刘重阳吕华亭符明海吴晨韩守鹏
Owner SHANGHAI INST OF SPECIAL EQUIP INSPECTION & TECHN RES