Corrosion Behavior of 304 Stainless Steel in Al-6Si-10Cu Energy Storage Alloy Solution
ZHANG Xiaohua1, YU Sirong2, TAN Zhe1, GUO Lijuan1, LIU Xu1
1 Department of Mechanical and Control Engineering, Shengli College China University of Petroleum, Dongying 257061 2 College of Mechanical and Electronic Engineering, China University of Petroleum, Qingdao 266580
Abstract: The compatibility of phase change energy storage materials with containers is one of the key factors for the successful application of solar energy storage technology. In this work, Al-6Si-10Cu alloy was chosen as the heat storage material, the 304 stainless steel as the container material. By designing a liquid corrosion test, the corrosion behavior and mechanism of 304 stainless steel in Al-6Si-10Cu energy storage alloy li-quid were investigated with the aid of metallographic microscope ,electron probe and XRD analyzer ect. What's more, the kinetic analysis of corrosion reaction was also carried out. The results showed that the corrosion layer consists of a inside layer and a outside layer. The inner corrosion layer is mainly composed of Al95Fe4Cr phase,banded and denser. And its microhardness is bigger than the outer layer's. The outer corrosion la-yer is loose and is mainly composed of FexSiyAlzphase and FeAl phase. Due to the blocking effects of intermetallic compounds such as Al95-Fe4Cr and FexSiyAlz on the diffusion of elements, the corrosion rate decreases first and then tends to slow down with the erosion time increasing. The thickness of corrosion layer and the corrosion weight loss increase gradually with the increase of the time,and then tend to be stable. The corrosion product's growth index n is 0.673, indicating that the corrosion type is diffusion corrosion.
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2019, Vol. 33 
