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| Influence of Marine Atmosphere Humidity On Initial Corrosion of LY12 |
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| 北京航空航天大学材料学院103教研室 |
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Abstract Series of accelerated corrosion tests were conducted in simulated marine atmosphere to study initial corrosion of LY12 aluminum alloy (corresponds to USA 2024) at different humidity. The change of corrosion morphology, weight gain, maximum pitting depth and electrochemical parameters (Corrosion Potential, AC Impedance) were inspected in corrosion course. Results showed that for Cl- deposition about 1 mg/dm2 and temperature 25℃, LY12 aluminum alloy did not erode under relative humidity 60%, can develop pitting corrosion in 31days above relative humidity 70%, erodes seriously not only in weight gain, but also in pit depth above relative humidity 90%. In marine atmospheric, the relationship of LY12 weight gain-time at different humidity fitted Model Boltzman. For pitting surface of LY12 at different humidity in marine atmosphere, Nyquist Graph was single arc of capacitance resist and the shape of arc was identical with retractile real part.
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Received: 19 January 2006
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