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采用静态腐蚀、XRD、SEM、EDS和XPS,研究了250℃时效4h和70%冷变形+200℃时效4h两种硬化状态下的925Ag75Cu与925Ag40Cu35Zn合金在37℃人造汗液和室温H2S气氛中的腐蚀与变色行为。结果表明,这两种925银合金在37℃人造汗液中的腐蚀变色是由Cl-和OH-离子引起的,但925Ag40Cu35Zn合金的变色过程明显比925Ag75Cu合金缓慢,腐蚀过程中产生的白色AgCl和灰黑色Ag2O难以在其表面沉积而形成灰黑色腐蚀膜。这两种925银合金在室温H2S气氛中的腐蚀变色是由S2-引起的,但925Ag40Cu35Zn合金的腐蚀变色过程明显比925Ag75Cu合金缓慢,这是由于腐蚀过程中白色ZnS最先形成,从而延缓了灰黑色Ag2S和黑色Cu2S的形成。
The corrosion of 925Ag75Cu and 925Ag40Cu35Zn alloy in two kinds of hardened state at 250 ℃ for 4h and 70% cold deformation and 200 ℃ for 4h were studied by artificial corrosion, XRD, SEM, EDS and XPS in 37 ℃ artificial sweat and room temperature H2S atmosphere And discoloration behavior. The results showed that the corrosion color changes of these two 925 silver alloys in artificial sweat at 37 ℃ were caused by Cl- and OH- ions, but the color change of 925Ag40Cu35Zn alloy was slower than that of 925Ag75Cu alloy. The white AgCl and ash Black Ag2O difficult to deposit on the surface to form a gray-black corrosion film. The corrosion discoloration of these two 925 silver alloys at room temperature in H2S atmosphere was caused by S2-, but the corrosion discoloration of 925Ag40Cu35Zn alloy was significantly slower than that of 925Ag75Cu alloy due to the first formation of white ZnS during the etching process, thus retarding the ash Formation of black Ag2S and black Cu2S.