Abstract
The compatibility between phase change alloys and container steels at the high temperature is limiting their potential applications in energy storage systems. In this paper, we investigated the erosion behavior of Al-12Si-2Mg-15Cu alloy against 304 stainless steel surface. The effect of temperature and immersion time on the erosion behavior was studied. The erosion rate and erosion thickness increased with the temperature increasing. With the increase of time, the erosion layer thickness increased, but the erosion rate decreased. The mechanisms which accounted for the formation and growth of diffusion layer were studied. The results show that the corrosion is mainly due to the diffusion of Al. The presence of Si element resists the growth of Fe-Al compounds and make erosion layer brittle. Ni-compounds can decrease the diffusion rate of Al atoms. Furthermore, the erosion layer adjacent to the steel substrate is brittle and its micro-hardness is higher.
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