The pretreatment of the plasma cleaner can significantly improve the bonding strength of the stainless steel surface coating

• Categories:Company Dynamics
• Author:Plasma cleaning machine-CRF plasma plasma equipment-plasma surface treatment machine manufacturer-chengfeng intelligent manufacturing
• Origin:
• Time of issue:2021-10-22
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(Summary description)The pretreatment of the plasma cleaner can significantly improve the bonding strength of the stainless steel surface coating: Due to its good mechanical properties, ease of processing and reliability, stainless steel is widely used in human implant materials, but due to the shortcomings of the metal itself such as thrombosis and poor corrosion resistance, the biocompatibility of stainless steel materials Not very ideal. A large number of clinical application results show that after the stainless steel artificial heart valve vascular stent is implanted in the human body, various degrees of thrombus and other adverse symptoms caused by thrombus appear on the surface of the material. Therefore, the research on how to improve the blood compatibility and histocompatibility on the surface of stainless steel materials is quite active. Among them, the method of introducing inorganic polymer materials or drugs with therapeutic effects on the surface of the materials has attracted widespread attention. In the study of various surface modification methods, the bond firmness between the coating and the substrate is an important parameter. There are many factors that affect the bonding strength between the coating and the metal substrate, such as the nature of the coating material, the chemical state and roughness of the substrate surface, the coating process, and so on. At present, most of the chemical and physical methods are used to change the chemical state or roughness of the substrate surface to improve the bonding strength between the coating and the substrate. The plasma technology process is one of the more commonly used physical treatment methods. Compared with traditional chemical methods, plasma modification belongs to a gas-solid coherent reaction system, which has the advantages of greatly improving the bonding strength between the coating and the substrate, and does not introduce other substances and does not pollute the environment. Analysis of samples after plasma treatment with a plasma cleaner revealed that the bonding strength of the surface coating of the material has been significantly improved, and the bonding strength of the surface has been enhanced. It can be seen that plasma treatment of stainless steel is an effective measure to improve the bonding strength of its surface coating. There is a layer of metal oxide and metal hydroxide on the surface of stainless steel that has been in the atmosphere for a long time. Between the metal oxide and metal hydroxide, a layer of hydrocarbon compounds is adsorbed on it. Despite a series of ultrasonic cleaning, a small amount of organic pollutants and cleaning solvents may still remain on the surface of the substrate. The surface of the sample without plasma treatment is covered with hydrocarbon compounds, and the plasma can completely remove the hydrocarbon compounds adsorbed on the surface of the stainless steel. After the plasma treatment of the plasma cleaner, the carbon hydrocarbon compounds adsorbed on the surface of the stainless steel are basically removed. The improvement of the surface cleanliness of the material is beneficial to improve the van der Waals force between the coating and the substrate. Plasma pretreatment can significantly improve the bonding strength of the stainless steel surface coating. After plasma treatment, the increase in the bonding strength of the film base is mainly related to the cleaning and etching of the surface of the base body. The increase in the bonding strength of the film substrate after plasma cleaning machine treatment is mainly due to its cleaning and activation of the substrate surface.