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Pulse electrochemical polishing processing method of fitanium alloy product

A technology of finishing and titanium alloy, applied in the field of pulse electrochemical finishing of titanium alloy products, can solve the problem of high price of non-aqueous electrolyte, and achieve the effects of low cost, improved brightness and high efficiency

Inactive Publication Date: 2006-10-25
DALIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In China, in the mid-1990s, Professor Zhu Shumin of Hefei University of Technology used formamide-based non-aqueous electrolyte to conduct DC electropolishing on titanium alloys, and achieved good results, which attracted great attention from the domestic and foreign electrical processing industries, and paid attention to it. However, due to the high price of non-aqueous electrolyte, it has not been used in actual production
However, the pulse electrochemical polishing technology is used to finish the titanium alloy in order to improve the corrosion resistance of titanium alloy products and improve the surface roughness. At present, there are no relevant reports at home and abroad.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: Implants such as precision forged clinical titanium alloy mesh, artificial bone, artificial joint, artificial tooth, various orthopedic objects, artificial heart valve stent, vascular sleeve anastomosis, cerebral hemostatic clip, and cardiovascular stent Or medical titanium alloy products such as surgical instruments, medical instruments and artificial prostheses, firstly after alkali cleaning, degreasing and water rinsing, the volume percentage is composed of: 36% HCl 80%, 40% HF 20% pickling solution , After pickling at room temperature for 30-120 seconds, rinse thoroughly with water. Then put into the polishing liquid and carry out pulse electrochemical polishing, wherein the weight percentage of the polishing liquid is composed of: 10%NaNO 3 , 55% HCONH 3 , 32% inorganic component A, 3% brightener B; wherein inorganic component A is H 3 NO 3 One or more mixtures of S, KI, and KSCN, brightener B is an equal weight mixture of saccharin and butynediol. T...

Embodiment 2

[0032] Embodiment 2: the titanium alloy parts such as aircraft engine blade, strainer that precision forging is formed, at first after alkaline cleaning degreasing, clear water rinsing, in volume percentage, be divided into: 36% HCl 95%, 40% HF 5% After pickling in the pickling solution at room temperature for 30-120 seconds, fully rinse with water, and then put it into the polishing solution for pulse electrochemical polishing. Wherein the weight percent of polishing liquid is composed of: 25% NaNO 3 , 62% HCONH 3 , 10% inorganic component A, 3% brightener B; wherein inorganic component A is H3NO 3 Equal weight mixture of S, KI, KSCN; brightener B is thiourea. The process parameters of pulse electrochemical polishing are:

[0033] Cathode Titanium alloy with surface roughness Ra=1.6-3.2μm

[0034] Anode stainless steel with a composition of 1Cr18Ni9Ti

[0035] Pulse peak current density i D 3-18A / cm 2

[0036] Pole spacing δ 5-30mm

[0037] Inter-electrode voltage V...

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PUM

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Abstract

A pulsive electrochemical process for polishing the Ti-alloy product in order to increase its biocompatibility, and anticorrosion property includes such steps as alkali washing for removing oil, rinsing, acid washing, rinsing, polishing by polishing liquid, rinsing and drying.

Description

technical field [0001] The invention relates to the field of metal electrochemical finishing, in particular to the pulse electrochemical finishing technology of titanium alloy products. Background technique [0002] Due to the poor cutting performance of titanium alloy and the surface is easy to oxidize, non-mechanical processing methods such as precision forging, vacuum precision casting, cold (hot) heading are usually used at home and abroad to form it, and electroplating, chemical plating, thermal diffusion, Thermal spraying, high-energy beam surface alloying, ion implantation, mechanical polishing and other methods are used for surface finishing and surface modification. The above-mentioned methods are either complex in process, have many influencing factors, and are difficult to master, or are prone to defects such as hydrogen embrittlement, cracks, and surface roughness; or have high cost and large investment in equipment. In recent years, relevant scholars at home an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25F3/26
Inventor 包胜华吴蒙华李智夏法锋
Owner DALIAN UNIV