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Titanium bolt surface ceramization method based on in-situ growth

An in-situ growth and ceramicization technology, applied in the direction of surface reaction electrolytic coating, electrolytic coating, coating, etc., can solve the problems of titanium bolt failure, corrosion failure of other parts, etc., to improve bearing capacity, resistance and wear resistance. Damage performance, good film bonding effect

Active Publication Date: 2019-01-25
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for ceramicizing the surface of titanium bolts based on in-situ growth, which solves the problems that titanium bolts are prone to failure and easily accelerate the corrosion failure of other parts when they are used in contact with other parts

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  • Titanium bolt surface ceramization method based on in-situ growth
  • Titanium bolt surface ceramization method based on in-situ growth

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Step 1. Surface pretreatment of titanium bolts of M8 (thread length 180mm) of TC4:

[0043] First, degrease and degrease the surface of the M8 titanium bolts of TC4, and then rinse them with deionized water; then, place the M8 titanium bolts of TC4 in a mixed electrolysis solution containing perchloric acid and glacial acetic acid at room temperature. Electrolytic polishing was carried out in a SORENSEN type electrolytic polishing machine with electrolytic solution. The electrolytic solution was a mixed solution of 50mL perchloric acid and 950mL glacial acetic acid. It was polished at a DC voltage of 55V for 30s, then rinsed with deionized water, and dried and stored with a hair dryer to obtain Pretreated titanium bolts;

[0044] Step 2. configuration pH is the electrolytic solution of the mixed acid system of 7, wherein comprises the sodium silicate of mass volume fraction 15%, the sodium aluminate of 10%, the sodium hexametaphosphate of 7%, the lemon of 5% in the elec...

Embodiment 2

[0048] Step 1. Surface pretreatment of titanium bolts of M8 (thread length 180mm) of TC4:

[0049] First, degrease and degrease the surface of the M8 titanium bolts of TC4, and then rinse them with deionized water; then, place the M8 titanium bolts of TC4 in a mixed electrolysis solution containing perchloric acid and glacial acetic acid at room temperature. Electrolytic polishing was carried out in a SORENSEN type electrolytic polishing machine with electrolytic solution. The electrolytic solution was a mixed solution of 50mL perchloric acid and 950mL glacial acetic acid. It was polished at a DC voltage of 55V for 30s, then rinsed with deionized water, and dried and stored with a hair dryer to obtain Pretreated titanium bolts;

[0050] Step 2. configuration pH is the electrolytic solution of the mixed acid system of 8.5, wherein comprises the sodium silicate of mass volume fraction 15%, the sodium aluminate of 10%, the sodium hexametaphosphate of 7%, the lemon of 5% in the el...

Embodiment 3

[0054] Step 1. Surface pretreatment of titanium bolts of M8 (thread length 180mm) of TC4:

[0055] First, degrease and degrease the surface of the M8 titanium bolts of TC4, and then rinse them with deionized water; then, place the M8 titanium bolts of TC4 in a mixed electrolysis solution containing perchloric acid and glacial acetic acid at room temperature. Electrolytic polishing was carried out in a SORENSEN type electrolytic polishing machine with electrolytic solution. The electrolytic solution was a mixed solution of 50mL perchloric acid and 950mL glacial acetic acid. It was polished at a DC voltage of 55V for 30s, then rinsed with deionized water, and dried and stored with a hair dryer to obtain Pretreated titanium bolts;

[0056] Step 2. configuration pH is the electrolytic solution of the mixed acid system of 9, wherein comprises the sodium silicate of mass volume fraction 15%, the sodium aluminate of 10%, the sodium hexametaphosphate of 7%, the lemon of 5% in the elec...

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Abstract

The invention discloses a titanium bolt surface ceramization method based on in-situ growth, which particularly comprises as follows: firstly, carrying out preprocessing on the surface of a test sample titanium bolt; then configuring electrolyte of a mixed acid system, carrying out micro-arc oxidation on the preprocessed titanium bolt in the electrolyte of the mixed acid system, and according to vanadate and tungstate which are added into the electrolyte in different concentration ratios, preparing different colors of titanium oxide based high-impedance ceramic layers, such as white, brick cyan, yellow, brown, black and the like; finally, carrying out dehydrogenization annealing on the titanium bolt subjected to micro-arc oxidation in a hydrogenation furnace to obtain a surface ceramic layer of the titanium bolt. The ceramic layer prepared by the method disclosed by the invention has an excellent mechanical property and a high impedance; adhesion and friction and abrasion of the titanium bolt are effectively improved, a safety coefficient and a service life of a heterogeneous metal connecting piece in a corrosion environment are effectively improved; the preparation method is environmentally friendly and can meet special demands in the fields of aviation, spaceflight, navigation, weapons and the like.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy surface treatment, and relates to a method for ceramicizing the surface of titanium bolts based on in-situ growth. Background technique [0002] Bolt is one of the common fasteners. In order to ensure the reliability of bolt connection, it is necessary to apply a certain torque pre-tightening force to the bolt, but the axial tension force and the friction between the bolt and the nut, the nut and the connecting piece The friction force between them is related, so for better reliability, it is necessary to reduce the friction force between them. The main modes of bolt failure are: "seizure", "loosening" and "fracture". Due to the low hardness of the material itself, the titanium bolts are more likely to cause seizure when the force is applied, and the fretting wear resistance is poor, so the bolt size is more likely to change and loosen. Secondly, due to the relatively positive potential o...

Claims

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Application Information

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IPC IPC(8): C25D11/26C22F1/18C22F1/02
CPCC22F1/02C22F1/183C25D11/026C25D11/26
Inventor 白力静周倩白亮聪校林飞赵奔杨辉
Owner XIAN UNIV OF TECH
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