12%Cr铁素体不锈钢板材显微组织特征对腐蚀性能的影响
Microstructure Characteristics and Its Effects on Corrosion of 12%Cr Ferritic Stainless Steel Plate
考肖琴
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作者单位：中海油能源发展油田建设 渤海工程分公司, 天津 300452
中文关键字：12%Cr铁素体不锈钢； 双相组织； 分层腐蚀； Ti稳定； 晶间腐蚀
英文关键字：12%Cr ferrite stainless steel; dual-phase microstructure; layered corrosion; Ti stabilized; intergranular corrosion
中文摘要：研究了410S和409L两种铁素体不锈钢板材热轧态显微组织特征、晶间腐蚀特征以及在6%FeCl3酸性腐蚀介质中的浸泡腐蚀特征。 结果表明， 410S在6%FeCl3酸性腐蚀介质中为分层腐蚀， 409L则为均匀腐蚀。410S在0.5 mol/L H2SO4 + 0.01 mol/L KSCN溶液中有明显的晶间腐蚀，409L没有晶间腐蚀。综合分析表明：实验用钢410S的腐蚀特征由双相组织所致，而409L主要是由于Ti元素的添加使得碳化物的析出减少。
英文摘要：The microstructure, inter-crystal corrosion characteristics and corrosion characteristics in the medium of 6%FeCl3 acid corrosion of hot-rolled sheet of 410S and 409L ferritic stainless steel were researched. The results are as follow: a significant layered corrosion phenomenon is in the media of 6%FeCl3 acid corrosion of 410S, but uniform corrosion in the 409L. There is obvious tendency of intergranular corrosion in 0.5 mol/L H2SO4 + 0.01 mol/L KSCN solution in 410S, but not in 409L. The analysis shows that the corrosion characteristics of testing steel 410S are induced by the dual-phase microstructure, while the corrosion characteristics of 409L ferritic stainless steel is due to the decrease of carbide precipitates when adding Ti element.