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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  • Abstract
  • Description
  • Claims
  • Application Information

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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

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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

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Example Embodiment

[0041] Example 1

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

[0043] First, degrease and degrease the surface of TC4 M8 titanium bolts, and then rinse them with deionized water; then, place TC4 M8 titanium bolts at room temperature in a mixed electrolysis solution containing perchloric acid and glacial acetic acid The electrolytic polishing is carried out in the SORENSEN electrolytic polisher with liquid electrolyte. The electrolyte is a mixed solution of 50mL perchloric acid and 950mL glacial acetic acid. Titanium bolts after pretreatment;

[0044] Step 2. Configure the electrolyte of the mixed acid system with a pH of 7, wherein the electrolyte includes 15% sodium silicate, 10% sodium aluminate, 7% sodium hexametaphosphate, 5% lemon Acid iron, put the titanium bolt treated in step 1 in the electrolyte of the mixed acid system, use stainless steel as the cathode, and titanium bolt as the anode. In the bipolar pulse power mode, set the forw...

Example Embodiment

[0047] Example 2

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

[0049] First, degrease and degrease the surface of TC4 M8 titanium bolts, and then rinse them with deionized water; then, place TC4 M8 titanium bolts at room temperature in a mixed electrolysis solution containing perchloric acid and glacial acetic acid The electrolytic polishing is carried out in the SORENSEN electrolytic polisher with liquid electrolyte. The electrolyte is a mixed solution of 50mL perchloric acid and 950mL glacial acetic acid. Titanium bolts after pretreatment;

[0050] Step 2. Configure the electrolyte of the mixed acid system with a pH of 8.5, wherein the electrolyte includes 15% sodium silicate, 10% sodium aluminate, 7% sodium hexametaphosphate, and 5% lemon by mass and volume. Acid iron, 3% vanadate, put the titanium bolt treated in step 1 in the electrolyte of the mixed acid system, use stainless steel as the cathode, and titanium bolt as the anode. In the...

Example Embodiment

[0053] Example 3

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

[0055] First, degrease and degrease the surface of TC4 M8 titanium bolts, and then rinse them with deionized water; then, place TC4 M8 titanium bolts at room temperature in a mixed electrolysis solution containing perchloric acid and glacial acetic acid The electrolytic polishing is carried out in the SORENSEN electrolytic polisher with liquid electrolyte. The electrolyte is a mixed solution of 50mL perchloric acid and 950mL glacial acetic acid. Titanium bolts after pretreatment;

[0056] Step 2. Configure the electrolyte of the mixed acid system with a pH of 9, wherein the electrolyte includes 15% by mass and volume of sodium silicate, 10% of sodium aluminate, 7% of sodium hexametaphosphate, and 5% of lemon Acid iron, 3% vanadate, put the titanium bolt treated in step 1 in the electrolyte of the mixed acid system, use stainless steel as the cathode, and titanium bolt as the anod...

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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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