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Production method of nickel-titanium alloy surface nickel-free layer

A technology of nickel-titanium alloy and nickel layer, which is applied in the field of surface engineering technology and biomaterials, can solve the problems of not being able to remove nickel and leave titanium, and achieve the effects of low cost, improved corrosion resistance, and improved coagulation time

Active Publication Date: 2015-10-07
WUXI SHENKANG MECHANICAL EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

From the reduction potential of Ni and Ti, it can be seen that when the two form a galvanic couple, Ti is the anode (activated state) and is dissolved; while Ni is the cathode and does not dissolve. As a result, it is impossible to remove nickel and leave titanium.

Method used

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  • Production method of nickel-titanium alloy surface nickel-free layer
  • Production method of nickel-titanium alloy surface nickel-free layer
  • Production method of nickel-titanium alloy surface nickel-free layer

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited thereto.

[0032] 1. The preparation method of the nickel-free layer on the surface of the nickel-titanium alloy is:

[0033] Ni: 56.3wt% and Ti: 43.599wt% in nickel-titanium alloy were selected, and the NiTi alloy plate was processed into a rectangular sample of 10mm×10mm×2mm by wire cutting method.

[0034] (1) Substrate pretreatment

[0035] Use metallographic paper 280#, 400#, 600#, 800#, 1000# to grind and polish the nickel-titanium alloy to be treated step by step; put the nickel-titanium alloy to be treated into acetone, absolute ethanol and distilled water respectively Ultrasonic cleaning for 10 minutes, then activation treatment with hydrofluoric acid and nitric acid solution (formulation: H2O:HF:HNO3=5:1:4) for 60s, cleaning and drying for later use;

[0036] (2) Surface...

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Abstract

The invention provides a production method of a nickel-titanium alloy surface nickel-free layer, and relates to the fields of surface engineering technologies and biomaterials. The method comprises the following steps: pre-treating nickel-titanium alloy, and placing the nickel-titanium alloy in an alloy removal treatment fluid to carry out a reaction in order to obtain nickel-titanium alloy with the surface being a nickel-free layer. The nickel-titanium alloy with the surface being the nickel-free layer has high corrosion and blood coagulation resistance to meet special demands of intravascular stents, cardiac valves and other human body intervention materials.

Description

technical field [0001] The invention belongs to the field of surface engineering technology and biomaterials, in particular to a method for preparing a nickel-free layer on the surface of a nickel-titanium alloy. Background technique [0002] With its special memory effect, superelasticity and good biocompatibility, the near-equal atomic ratio NiTi shape memory alloy has been obtained in medical fields such as artificial joints, bone trauma products, dental implants, artificial heart valves, and interventional vascular stents. Wide range of clinical applications. NiTi alloy is used as a medical biomaterial. Since NiTi alloy contains more than 50at% nickel, when NiTi alloy is implanted into the human body, a corrosion process will occur, releasing metal ions, and interacting with biological tissues, causing tissue mutation and modification , Trouble normal physiological functions, mild cases cause inflammation, severe cases lead to implantation failure, and even cause cancer...

Claims

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Application Information

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IPC IPC(8): C23F1/44
Inventor 邵红红朱姿虹王兰丁红燕刘雪丽
Owner WUXI SHENKANG MECHANICAL EQUIP
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