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对比研究了2种Cr-Ni系高强度钢在人造海水条件下耐蚀性能差异,采用ASPEX自动扫描电镜分析了钢中夹杂物种类、数量和分布,利用金相显微镜对夹杂物引发腐蚀的过程开展了原位分析,并利用扫描电镜(SEM),观察了腐蚀后样品的微观形貌。全浸腐蚀实验结果表明,A钢虽然合金含量较高,但其腐蚀速率要大于B钢;夹杂物分析及其原位腐蚀实验研究表明,B钢通过Ca处理获得了良好的夹杂物改性效果,将钢中对耐蚀性提高不利的MnS夹杂物改性为CaS复合夹杂物,降低了B钢的点蚀敏感性,提高了B钢的耐蚀性能。
The corrosion resistance of two kinds of Cr-Ni high-strength steels under artificial seawater conditions were comparatively studied. The types, amount and distribution of inclusions in steel were analyzed by ASPEX automatic scanning electron microscope. The corrosion of inclusions by metallographic microscope In situ analysis was carried out and the microstructure of the samples after corrosion was observed by scanning electron microscopy (SEM). The results of immersion corrosion test show that the corrosion rate of steel A is higher than that of steel B, although the content of alloy is higher than that of steel B. The analysis of inclusions and in-situ corrosion experiments show that steel B has good inclusion modification effect by Ca treatment , The steel to improve the corrosion resistance of MnS inclusions modified into CaS composite inclusions, reducing the corrosion resistance of B steel pitting and improve the corrosion resistance of B steel.