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| A STUDY OF ELECTROCHEMICAL IMPEDANCE SPECTRUMFOR CORROSION BEHAVIOR OF LY12 ALUMINUM ALLOY IN SIMULATED ACID RAIN |
| Baigang An;Xueyuan Zhang;Shzhe Song |
| 天津大学 |
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Abstract The effects that pH of simulated acid rain on corro sion behavior of LY12 aluminum alloy was investigated by electrochemical impedan ce spectrum and polarization curves.It was found that corrosion potential shifts to less noble value with increasing pH at the lower 3.1 and shifts to more nobl e value at the higher 3.4.In the solutions with pH≤3.4,the surface film of LY12 aluminum alloy was dissolved and the thickness of surface film and film resista nce decreased with immersion time,thus corrosion rate of LY12 aluminum alloy inc reased.In the solutions with pH≥3.8,the film thickness of LY12 aluminum alloy h ad no apparent change with immersion time,the film resistance increased with imm ersion time,and thus corrosion rate decreased.The results was discussed from sur face film of LY12 aluminum alloy,adsorption of anions and corrosion products.
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Received: 20 November 2001
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Corresponding Authors:
Baigang An
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