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Process method for improving surface quality of beta-type titanium alloy during acid pickling

A technology of surface quality and process method, which is applied in the field of improving the surface quality of β-type titanium alloy during pickling, can solve problems such as corrosion pits, pitting, and affecting production progress, and achieve simple process operation, improve pickling efficiency, and reduce labor costs. intensity effect

Active Publication Date: 2020-12-08
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when using the traditional pickling method to pickle this type of titanium alloy, it was found that when the pickled parts were put into the sink for cleaning, the surface quickly turned black and acid spots formed locally. The popular description is " When it meets water, it will turn black". In severe cases, defects such as pitting and corrosion pits will be formed, which will affect the surface quality of pickling parts
Although experienced operators use fast-flowing water to quickly and one-by-one rinse the surface of the parts, it will be improved, but due to the complex features of the parts such as variable cross-sections, grooves, and holes, it is still impossible to completely eliminate the titanium alloy surface. Black, the problem of acid spots, pockmarks, and corrosion pits locally formed
This increases the labor intensity of the operators, affects the production progress, and affects the stability of the parts pickling process, which is not suitable for industrial large-scale high-efficiency pickling
In addition, some engineers and technicians have slowed down this phenomenon by appropriately changing the composition ratio of hydrofluoric acid-nitric acid-water solution, but they still cannot completely eliminate the above problems.
Therefore, in order to solve the technical problems of blackened pickling surface of β-type titanium alloy, easy to form acid spots, pits and corrosion pits locally, and improve the quality of pickling surface of β-type titanium alloy, it is necessary to design a new type suitable for industrial large-scale production. mass production process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Taking the method of pickling 20mm thick TB8 titanium alloy plate to remove scale as an example, it includes the following steps:

[0022] (1) Pretreatment before pickling: use dry sandblasting to preliminarily remove the scale on the surface of the TB8 titanium alloy plate, then remove the sand attached to the surface with water at room temperature, and then dry the water stains on the plate with compressed air;

[0023] (2) Pickling: immerse the TB8 titanium alloy plate treated in step (1) at room temperature into a mixture of 560ml / l industrial grade nitric acid, 45ml / l industrial grade hydrofluoric acid, and the balance of water Carry out pickling in the solution, pickling time is 10 minutes;

[0024] (3) Acid cleaning: The TB8 titanium alloy plate processed in step (2) is quickly immersed in a mixed solution with a content of 120ml / l industrial grade nitric acid and a balance of water within 20 seconds for cleaning. for 10 seconds;

[0025] (4) Water cleaning: Cl...

Embodiment 2

[0028] Taking the pickling process involved in the process of passivating TB17 titanium alloy parts as an example, it includes the following steps:

[0029] (1) Pretreatment before pickling: TB17 titanium alloy parts are chemically degreased and alkaline cleaned, then cleaned with water at room temperature, and then dry the water stains on the surface of TB17 titanium alloy parts with compressed air;

[0030] (2) Pickling: immerse the TB17 titanium alloy parts treated in step (1) into a mixture of 600ml / l industrial-grade nitric acid, 50ml / l industrial-grade hydrofluoric acid, and the balance of water at room temperature. Carry out pickling in the solution, pickling time is 5 minutes;

[0031] (3) Acid cleaning: The TB17 titanium alloy parts treated in step (2) are quickly immersed in a mixed solution with a content of 150ml / l industrial grade nitric acid and a balance of water within 20 seconds for cleaning. for 8 seconds;

[0032] (4) Water cleaning: Clean the TB17 titaniu...

Embodiment 3

[0035] Taking the pickling process involved in the process of passivating TC18 titanium alloy parts as an example, it includes the following steps:

[0036] (1) Pretreatment before pickling: TC18 titanium alloy parts are chemically degreased and alkaline cleaned, then cleaned with water at room temperature, and then dry the water stains on the surface of TC18 titanium alloy parts with compressed air;

[0037] (2) Pickling: immerse the TC18 titanium alloy parts treated in step (1) at room temperature into a mixture of 650ml / l industrial grade nitric acid, 60ml / l industrial grade hydrofluoric acid, and the balance of water Carry out pickling in the solution, pickling time is 8 minutes;

[0038] (3) Acid cleaning: The TC18 titanium alloy parts treated in step (2) are quickly immersed in a mixed solution with a content of 180ml / l industrial grade nitric acid and a balance of water within 20 seconds for cleaning. for 10 seconds;

[0039] (4) Water cleaning: Clean the TC18 titaniu...

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Abstract

The invention belongs to the technical field of titanium alloy surface treatment, and relates to a process method for improving the surface quality of beta-type titanium alloy during acid pickling. According to the method, the nitric acid aqueous solution with a certain concentration is introduced to perform short-time acid cleaning on the titanium alloy, the proportion components of the picklingsolution are correspondingly adjusted, the nitric acid aqueous solution with stronger acidity and higher concentration preferentially performs micro-passivation reaction with a titanium alloy matrix,the reaction between residual hydrofluoric acid and the titanium alloy matrix is fully inhibited, the risk of hydrogen absorption of the titanium alloy matrix is eradicated, the surface of a part subjected to acid pickling is free of acid spots, pits, corrosion pits and other defects, the surface is silvery white, and the technical problem that the surface quality is not high when beta-type titanium alloy is subjected to acid pickling cleaning is fundamentally solved; and the process is simple and convenient to operate, is suitable for pickling and cleaning of nearly beta-type, metastable beta-type and fully stable beta-type titanium alloys, reduces the labor intensity of operators, improves the pickling efficiency, enhances the stability of the pickling surface quality of the beta-type titanium alloys, and is particularly suitable for industrial large-scale production.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy surface treatment, and relates to a process method for improving the surface quality of beta-type titanium alloy during pickling. Background technique [0002] Titanium alloy pickling process is a relatively mature surface treatment technology. In industry, titanium alloys are generally pickled with hydrofluoric acid-nitric acid-water solution system. The principle is that hydrofluoric acid solution can destroy and dissolve the passivation film on the surface of titanium alloys, and remove part of the matrix to obtain better surface quality. At the same time, a certain concentration of nitric acid solution is added to inhibit the generation of hydrogen and eliminate the risk of hydrogen absorption by the matrix. The pickling process is used in semi-finished products of titanium alloys, including plates, strips, profiles, pipes, wires, bars, forgings, die forgings, castings, sheet metal par...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/10
CPCC23G1/106
Inventor 朱知寿李明兵王新南商国强祝力伟李静
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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