Surface passivation treatment method of martensitic antibacterial stainless steel for surgical instruments

Abstract

The invention discloses a surface passivation treatment method of martensite antibacterial stainless steel for a surgical operating instrument. The passivation treatment method comprises the steps that the antibacterial stainless steel surgical operation instrument is placed in a passivation solution, the passivation treatment temperature is set to be 85-95 DEG C, the passivation time is 0.2-0.5 h, then the instrument is washed with water, and the whole passivation process is finished. The passivation solution used in the surface passivation treatment method of the antibacterial stainless steel is formed by mixing raw materials including anhydrous cupric sulfate and a nitric acid aqueous solution. The passivation solution is prepared from, by weight, 1.5*10<-3>-2.5*10<-3> g / L of the anhydrous cupric sulfate, 25-35 g / L of nitric acid and the balance deionized water. By the adoption of the passivation treatment method, the effect that the antibacterial stainless steel surgical operation instrument has great corrosion resistance and antibacterial performance at the same time can be guaranteed.

Description

technical field [0001] The invention belongs to the technical field of surface treatment of antibacterial stainless steel materials, and in particular relates to a surface passivation treatment method of martensitic antibacterial stainless steel for surgical instruments. Background technique [0002] Stainless steel for surgical instruments is mostly martensitic stainless steel, such as 2Cr13, 3Cr13 and PH17-4. Martensitic antibacterial stainless steel is a new type of biofunctional integrated new material based on the existing ordinary stainless steel with an appropriate amount of copper added, and its basic physical and chemical properties are equivalent to ordinary stainless steel. One of the outstanding advantages of martensitic stainless steel is that it has good strength and can be used to process surgical instruments that require good hardness and wear resistance for cutting and shearing. However, because its use and disinfection environment generally contain certain...

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Problems solved by technology

However, since its use and disinfection environment generally contain certain corrosive media, surgical instruments often corrode during use, which affects their performance.

[0003] In order to improve the corrosion resistance of stainless steel products for surgical instruments, the existing method is often to use chrome plating on the surface. This method has two important shortcomings for antibacterial stainless steel surgical instruments: one is that although the surface is chrome-plated The corrosion resistance of the stainless steel material has been greatly improved, but due to the appearance of the chrome plating layer, the antibacterial stainless steel antibacterial element Cu ions are prevented from diffusing to the environmental medium through the surface, that is to say, the antibacterial performance is greatly reduced; Exceeding the standard brings biological safety problems

However, surface passivation for antibacterial stainless steel, due to the formation of a relatively dense Cr-rich oxide layer on the surface of the material, will still hinder the diffusion of copper in the passivation layer to a certain extent, reducing the antibacterial performance of the material.

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