کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6602723 | 1424079 | 2018 | 55 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Corrosion behavior of AZ31 magnesium alloy in the chloride solution containing ammonium nitrate
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Corrosion behavior of AZ31 magnesium alloy in NH4NO3-containing chloride solution was investigated by immersion tests, hydrogen evolution collection, electrochemical measurements, and microscopic observation. Addition of NH4NO3 accelerates corrosion due to the deterioration of Mg(OH)2 by NH4+ and the promotion of cathodic NO3â reaction, which is supported by the buffering effect of NH4+. Hydrogen evolution is suppressed with addition of high concentrations of NH4NO3, attributed to the preferential occurrence of NO3â reduction. Loose and cracked corrosion products, which are mainly composed of Mg2(OH)3Cl·4H2O and magnesium hydroxy carbonates, form in the NH4NO3-containing environment. When the NH4NO3 concentration is between 0.005 and 0.03â¯M, autocatalytic pitting corrosion occurs due to the synergistic effects of Clâ, NH4+, and NO3â at the specific concentration range. The H+ (supplied by NH4+ hydrolysis), Clâ in combination with the depolarization effect of NO3â support the autocatalytic growth and eventually perforate the alloy. With the addition of NH4NO3 higher than 0.05â¯M, corrosion pits with shallow-dish shape form initially and then evolves into general corrosion, because general corrosion is promoted by the decrease of solution pH, suppression of Mg(OH)2 precipitation, and enhancement of cathodic reactions.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 278, 10 July 2018, Pages 421-437
Journal: Electrochimica Acta - Volume 278, 10 July 2018, Pages 421-437
نویسندگان
Zhongyu Cui, Feng Ge, Yi Lin, Liwei Wang, Li Lei, Huiyun Tian, Mingdong Yu, Xin Wang,