磷酸浓度对316L不锈钢耐蚀性及钝化膜特性的影响  

Effect of Phosphoric Acid Concentration on Corrosion Resistance and Passivation Film Properties of 316L Stainless Steel

作　　者：张媛 张弦 陈思雨 李腾 刘静 吴开明 ZHANG Yuan;ZHANG Xian;CHEN Siyu;LI Teng;LIU Jing;WU Kaiming(Hubei Province Key Laboratory of Systems Science in Metallurgical Process,Collaborative Innovation Center for Advanced Steels,The State Key Laboratory of Refractory Material and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China;Department of Radiochemistry,China Institute of Atomic Energy,Beijing 102413,China)

机构地区：[1]武汉科技大学耐火材料与冶金省部共建国家重点实验室高性能钢铁材料及其应用省部共建协同创新中心冶金工业过程系统科学湖北省重点实验室,武汉430081 [2]中国原子能科学研究院放射化学研究所,北京102413

出　　处：《中国腐蚀与防护学报》2022年第5期819-825,共7页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金(51601138和51601137)

摘　　要：利用电化学方法测量316L不锈钢在不同浓度磷酸溶液中的极化曲线、电化学阻抗、恒电位极化曲线和M-S曲线,利用XPS技术对钝化膜的成分进行表征。结果表明,316L不锈钢在空气中和磷酸溶液中形成的钝化膜均具有双层结构,内层主要含Cr_(2)O_(3),在空气中形成的钝化膜外层为Fe的氧化物和氢氧化物,在磷酸溶液中形成的钝化膜外层则为Fe的氧化物和磷酸盐。当磷酸浓度小于1 mol/L时,316L不锈钢表面钝化膜受到的破坏较小,其依旧维持较好的耐腐蚀性,随着腐蚀时间的延长,钝化膜会由致密变疏松;当磷酸浓度大于1 mol/L时,表面钝化膜受到的破坏较为严重,耐腐蚀性明显降低,钝化膜变薄且疏松,但是难溶腐蚀产物的生成相对减缓了钝化膜被破坏的进程。These results show that the passivation films formed on 316L stainless steel in air and phosphoric acid solution have a double-layered structure.The inner layer mainly contained Cr_(2)O_(3).The outer layer of passive film formed in air was composed of Fe oxides and hydroxides.The outer layer of the passive film formed in phosphoric acid solutions was Fe oxide and phosphate.When the phosphoric acid concentration was less than 1 mol/L,the passive film of 316L stainless steel is less damaged,maintaining good corrosion resistance.However,as corrosion time extended,the passivation film would change from compact to loose.When the phosphoric acid concentration was greater than 1 mol/L,the passive film was seriously damaged,becoming thin and loosened,so that the corrosion resistance was obviously reduced.The formation of insoluble corrosion products relatively slows down the process of passive film damage.

关 键 词：磷酸 316L不锈钢 钝化膜 耐腐蚀性 

分 类 号：TG174[金属学及工艺—金属表面处理]