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对经固溶处理的含铜双相不锈钢材料进行了540,560和580℃时效处理。利用电化学工作站研究了固溶及时效处理试样在无菌/含菌培养基中的耐蚀性,同时采用OM及XPS检测手段对固溶处理试样及抗菌性最优的经560℃时效处理试样菌液腐蚀后的生物膜形貌及表层Cu的腐蚀产物进行了分析。结果表明,在无菌培养基中,固溶处理试样最耐蚀,经时效处理的试样随时效处理温度的升高,耐蚀性下降;在含菌培养基中,经560和580℃时效处理试样的耐蚀性比其在无菌环境中的有所提高,固溶处理及经540℃时效处理试样的耐蚀性比其在无菌环境中的有所下降。固溶处理试样表面存在厚大疏松状生物膜,表层腐蚀产物中Cu CO3含量相对较低,细菌腐蚀导致试样在含菌介质中的耐蚀性比其在无菌介质中的差;经560℃时效处理试样的表层覆盖稀薄生物膜,细菌对试样腐蚀破坏作用弱,表层腐蚀产物中Cu CO3含量高,Cu CO3对试样的保护作用大于细菌的破坏作用,使得其在菌液中的耐蚀性比其在无菌环境中的有所提高。
The solution treated copper-containing duplex stainless steel was aged at 540, 560 and 580 ℃. The electrochemical workstation was used to study the corrosion resistance of solution-treated and aging-treated samples in aseptic / bacteria-containing media. OM and XPS were used to test the solution treatment and the best antimicrobial activity at 560 ℃ The biofilm morphology and the corrosion products of Cu on the surface of the sample were also analyzed. The results showed that in the sterile medium, the most corrosion-resistant and aging-treated samples were treated with aging treatment at elevated temperature and the corrosion resistance decreased. In the medium containing 560 and 580 ℃ The corrosion resistance of the aging treated specimens was higher than that of the specimens in the aseptic environment. The corrosion resistance of the specimens treated with the solution treatment and the aging treatment at 540 ℃ was lower than that under the aseptic environment. Large loose bulk biofilms were present on the surface of the solution-treated samples, and the content of CuCO3 in the surface corrosion products was relatively low. The corrosion of the samples in the bacteria-containing medium caused by bacterial corrosion was worse than that in the sterile medium. The surface layer of the sample aged at 560 ℃ was covered with a thin biofilm. The bacterium had a weak effect on the corrosion of the sample. The content of CuCO3 in the surface corrosion product was high. The protective effect of CuCO3 on the sample was greater than that of the bacteria, In the corrosion resistance than in its sterile environment has improved.