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| Effect of Phosphoric Acid Concentration on Corrosion Resistance and Passivation Film Properties of 316L Stainless Steel |
ZHANG Yuan1, ZHANG Xian1( ), CHEN Siyu1, LI Teng2(), LIU Jing1, WU Kaiming1 |
1.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
2.Department of Radiochemistry, China Institute of Atomic Energy, Beijing 102413, China |
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Abstract 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 Cr2O3. 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.
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Received: 22 September 2021
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| Fund: National Natural Science Foundation of China(51601138);National Natural Science Foundation of China(51601137) |
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Corresponding Authors:
ZHANG Xian,LI Teng
E-mail: xianzhang@wust.edu.cn;liteng@ciae.ac.cn;liteng@wust.edu.cn
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About author: LI Teng, E-mail： liteng@ciae.ac.cn
ZHANG Xian, E-mail: xianzhang@wust.edu.cn
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