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采用光学显微镜、场发射扫描电镜(FESEM)及EDS能谱仪、X射线衍射仪、硬度计等对腐蚀失效316L不锈钢波纹管显微组织、表面形貌、腐蚀前后的物相及显微硬度进行了分析。结果表明,腐蚀失效316L不锈钢波纹管显微组织中的相组成为奥氏体和少量的铁素体,铁素体相在使用过程中最先被腐蚀是造成316L不锈钢波纹管的耐蚀性能下降的主要原因。316L不锈钢波纹管腐蚀表面含有较多铁的氧化物和硫化物以及铝的氧化物,蚀坑深度达30.6μm。
The microstructure, surface morphology, phase before and after corrosion, and microhardness of 316L stainless steel corrugated tube with corrosion failure were observed by optical microscope, field emission scanning electron microscope (FESEM), EDS, XRD and hardness tester Analysis. The results show that the phase composition of 316L stainless steel bellow microstructure is austenite and a small amount of ferrite. The corrosion of ferrite phase is the first to be corroded in 316L stainless steel bellow. The main reason. 316L stainless steel corrugated pipe corrosion surface contains more iron oxide and sulfide and aluminum oxide, corrosion pit depth of 30.6μm.