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Pitting Corrosion of 7020 Aluminum Alloy in 3.5%NaCl Solution |
Yun DAI1,2,3,Shengdan LIU1,2,3(),Yunlai DENG1,2,3,Xinming ZHANG1,2,3 |
1 School of Materials Science and Engineering, Central South University, Changsha 410083, China 2 Key Laboratory of Nonferrous Materials Science and Engineering, Ministry of Education, Central South University, Changsha 410083, China 3 Nonferrous Metal Oriented Advanced Structural Materials and Manufacturing Cooperative Innovation Centre, Changsha 410083, China |
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Abstract The pitting corrosion behavior of 7020 aluminum alloy in 3.5%(mass fraction) NaCl solution was investigated by immersion test and cyclic polarization curve, while the corrosion morphology of the alloy was characterized by means of optical microscopy (OM), scanning electron microscopy (SEM) and scanning transmission electron microscopy (STEM). The results show that the curve of maximum depth of corrosion pits versus time exhibits ''S''-like shape. α-AlFeSiMn phase may act as a local cathode, thereby de-alloying occurred around particles of α-AlFeSiMn phase, i.e. Al matrix nearby the particles of α-AlFeSiMn phase was dissolved due to its anode nature, while Mn-and Cr-containing precipitates in the matrix may fall off along with the dissolved Al. Pitting susceptibility reduces in the later stage of corrosion due to that the formed corrosion products may act as a protective barrier for the alloy to some extent.
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Received: 04 February 2016
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