Effect of Heat Treatment on Intergranular Corrosion Susceptibility of 430 Stainless Steel Evaluated by Electrochemical Potentiodynamic Reactivation
摘 要
利用电化学动电位再活化(EPR)并结合金相分析研究了热处理温度、冷却方式和保温时间对430不锈钢晶间腐蚀敏感性的影响。结果表明:430不锈钢开始敏化温度区间为700~750℃,随着热处理温度的升高,晶粒逐渐长大,敏化程度的变化以及碳氮化物析出位置受随后的冷却方式影响;热处理温度为900℃时,430不锈钢在短时间内发生敏化,随着保温时间的延长,敏化程度并没有明显降低;700℃下短时间保温并空冷能够有效降低已敏化430不锈钢的晶间腐蚀敏感性。
Abstract
The effects of heat treatment temperature, cooling method and holding time on the intergranular corrosion susceptibility of 430 stainless steel were studied by electrochemical potentiodynamic reactivation (EPR) combined with metallographic analysis. The results show that the sensitization of 430 stainless steel began to occur in the temperature range of 700-750℃. With the increase of heat treatment temperature, the grain gradually grew, the degree of sensitization and carbonitride precipitation position were affected by subsequent cooling method. When heat treatment temperature was 900℃, 430 stainless steel was sensitized in a short time, and the degree of sensitization of 430 stainless steel was not significantly reduced with the extension of holding time. Heat treatment for a short time at 700℃ and air cooling could effectively reduce the intergranular corrosion susceptibility of the sensitized 430 stainless steel.
中图分类号 TG174 DOI 10.11973/fsyfh-201810002
所属栏目 试验研究
基金项目 广东省质量技术监督局科技项目(2016ZZ06)
收稿日期 2017/4/10
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引用该论文: HUANG Zidong,WEI Liangxin,HONG Zehao,JIANG Yikui,LI Jielong,CAI Fumin. Effect of Heat Treatment on Intergranular Corrosion Susceptibility of 430 Stainless Steel Evaluated by Electrochemical Potentiodynamic Reactivation[J]. Corrosion & Protection, 2018, 39(10): 740
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【3】温军国,郑弃非,涂思京,等. 热处理对铁素体不锈钢组织和性能的影响[J]. 稀有金属,2006,30(S1):152-154.
【4】万章. 铁素体不锈钢晶间腐蚀问题的探讨[J]. 石油化工腐蚀与防护,2015,32(4):62-64.
【5】全国钢标准化技术委员会. 金属和合金的腐蚀不锈钢晶间腐蚀试验方法:GB/T 4334-2008[S]. 北京:中国标准出版社,2008:6.
【6】STREICHER M A. Screening stainless steels from the 240 h nitric acid test by electrolytic etching in oxalic acid[J]. ASTM Bulletin,1953:35-38.
【7】SMIALOWSKA S S,GRAGNOLINO G. Stress corrosion cracking of sensitized type 304 stainless steel in oxygenated pure water at elevated temperature[J]. Corrosion,1980,36(12):653-665.
【8】田昭武. 电化学实验方法进展[M]. 厦门:厦门大学出版社,1988.
【9】查小琴,王小华. 低铬铁素体不锈钢晶间腐蚀敏感性的测试方法[J]. 理化检验-物理分册,2011,47(12):741-743.
【10】胡方坚,伍玉琴,钟祥玉,等. 铁素体不锈钢的晶间腐蚀性能研究[J]. 腐蚀科学与防护技术,2009,21(2):110-112.
【11】强少明,江来珠,李劲,等. 双环电化学动电位再活化法评价11Cr铁素体不锈钢晶间腐蚀敏感性[J]. 金属学报,2015,51(11):1349-1355.
【12】全国钢标准化技术委员会. 金属和合金的腐蚀双环电化学动电位再活化测量法:GB/T 29088-2012[S]. 北京:中国标准出版社,2012.
【13】高文娇,谭华. 退火温度对Incoloy800合金晶间腐蚀敏感性的影响[J]. 材料热处理学报,2012,33(2):1-6.
【14】胡潘,毛宏焕,杨戈涛. 碳含量对430铁素体不锈钢耐晶间腐蚀性能的影响[J]. 腐蚀与防护,2016,37(12):956-960.
【15】AMADOU T,BRAHAM C,SIDHOM H. Double loop electrochemical potentiokinetic reactivation test optimization in checking of duplex stainless steel intergranular corrosion susceptibility[J]. Metallurgical and Materials Transactions A,2004,35(11):3499-3513.
【16】黄子东,江乙逵,陈惠波,等. 铁素体不锈钢餐具铬离子析出量超标的原因分析[J]. 理化检验-物理分册,2016,52(7):489-493.
【17】方可伟,刘飞华,李岩. EPR法在评价304L不锈钢晶间腐蚀敏感性中的应用[J]. 腐蚀与防护,2012,33(10):867-871.
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