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A process method for improving the surface quality of β-type titanium alloy during 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 the problems of acid spots, corrosion pits, pitting, etc. easy effect

Active Publication Date: 2022-07-12
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 sheet to remove oxide scale as an example, it includes the following steps:

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

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

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

[0025...

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 treated by chemical degreasing and alkali washing, then they are washed with water at room temperature, and then the water stains on the surface of TB17 titanium alloy parts are dried with compressed air;

[0030] (2) Pickling: the TB17 titanium alloy parts treated in step (1) are immersed in a mixture of 600ml / l industrial grade nitric acid, 50ml / l industrial grade hydrofluoric acid and the balance of water at room temperature Pickling is carried out in the solution, and the 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 the balance of water within 20 seconds for cleaning. The cleaning time is 8 second...

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 treated by chemical degreasing and alkali washing, then they are washed with water at room temperature, and then the water stains on the surface of TC18 titanium alloy parts are dried with compressed air;

[0037] (2) Pickling: the TC18 titanium alloy parts treated in step (1) are immersed in a mixture containing 650ml / l technical grade nitric acid, 60ml / l technical grade hydrofluoric acid and the balance of water at room temperature Pickling is carried out in the solution, and the 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 technical grade nitric acid and the balance of water within 20 seconds for cleaning. The cleaning time is 10 ...

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Abstract

The invention belongs to the technical field of surface treatment of titanium alloys, and relates to a process method for improving the surface quality of beta-type titanium alloys during pickling; the invention performs short-term acid cleaning on titanium alloys by introducing a certain concentration of nitric acid aqueous solution, and adjusts the pickling accordingly. The composition of the liquid ratio, the nitric acid aqueous solution with stronger acidity and higher concentration preferentially undergoes a micro-passivation reaction with the titanium alloy matrix, which fully inhibits the reaction between the residual hydrofluoric acid and the titanium alloy matrix, and eliminates the risk of hydrogen absorption by the titanium alloy matrix. After pickling, the surface of the parts has no defects such as acid spots, pits, and pits, and the surface is silver-white, which fundamentally solves the technical problem that the surface quality of β-type titanium alloy is not high during pickling and cleaning; the process of the invention is easy to operate and suitable for For the pickling cleaning of near β-type, metastable β-type and fully stable β-type titanium alloys, it not only reduces the labor intensity of operators, improves the pickling efficiency, but also enhances the stability of the pickling surface quality of β-type titanium alloys. Especially suitable for industrial mass 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 alloys during pickling. Background technique [0002] Titanium alloy pickling process is a relatively mature surface treatment technology. In industry, the hydrofluoric acid-nitric acid-water solution system is generally used for pickling titanium alloys. 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 titanium alloys, including sheets, strips, profiles, tubes, wires, bars, forgings, die forgings, castings, as well as sheet metal and machined parts. The purpose is to remove titanium Alloy surface oxide scale and hard alpha layer. In addition, in the process of anodizing, passivation, electroplating and welding of ...

Claims

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Application Information

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Patent Type & Authority Patents(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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