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对在热腐蚀环境中工作的12Cr2NiWVA钢汽缸发生的早期腐蚀失效进行了分析。利用电子显微镜分析环境介质对汽缸的影响及发生腐蚀的原因。结果表明,由于12Cr2NiWVA钢发生高温热腐蚀而生成铬的化合物,同时由于12Cr2NiWVA钢渗氮后的化合物层受到破坏和加工导致氮扩散层厚度的减少降低了工件耐磨性和耐蚀性;另外汽缸基体组织不均匀也导致基体性能存在差异,从而使汽缸在较高燃气压力冲击作用下加速了腐蚀。
The early corrosion failure of a 12Cr2NiWVA steel cylinder operating in hot corrosive environment was analyzed. Using electron microscope to analyze the influence of environmental medium on cylinder and the cause of corrosion. The results show that due to high temperature hot corrosion of 12Cr2NiWVA steel to produce chromium compounds, and 12Cr2NiWVA steel after nitriding compound layer is damaged and processed resulting in reduced nitrogen diffusion layer thickness reduces the wear resistance and corrosion resistance of the workpiece; the other cylinder Inhomogeneous matrix structure also results in differences in substrate properties, resulting in accelerated cylinder erosion at higher gas pressure impacts.