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Research on Corrosion and Protection of Mild Steel Used to Make Crucible for Magnesium Alloy Melting

Author: WangShuanQiang
Tutor: LiuJianZuo；HuangWeiDong
School: Northwestern Polytechnical University
Course: Materials Processing Engineering
Keywords: magnesium alloy iron-based crucible mild steel composition coating corrosion and protection
CLC: TG174
Type: Master's thesis
Year: 2007
Downloads: 126
Quote: 0
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Abstract


Crucible is one of the main smelting units for the melting magnesium and its alloy. The crucible is generally made of carbon steel at present. However the iron-based crucible was easily eroded and oxidized by high temperature magnesium alloy liquid, agent of fusion and protective gas, it not only shortened the operational life of the crucible, but also debased the quality of magnesium alloy. The subject investigated of this research was low carbon steel which was made as melting magnesium alloy crucible. The performance of low carbon steel crucible, used to melt magnesium alloy, was investigated. The composite coating on the surface of aluminized steel was made by high-temperature reaction. The relationship between the thickness and technological parameter was analyzed. The microstructures and composition of the layer were investigated by means of optical microscope and X-ray Diffraction （XRD）. Protection of the coating was study by immersing the coating samples in AZ91 alloy liquid wholly. Three main characters of the coating were tested, including heated shock resistance, high temperature oxidation resistance and agent of fusion corrosion resistance. The conclusions were as follows:（1） The target materials, such as TiB2 and MgO, which were selected by calculating of thermodynamic feasibility, have good stability and didn’t react with magnesium alloy liquid.（2） The relationship between the thickness of coating and two processes parameters （ reaction temperature and holding time ） were investigated by metallographic analysis. The result showed that the coating which was made of transition layer and outer layer was tightly combined with the substrates. The thickness of coating increased when the reaction temperature and holding time grew. The layer was consisted of TiB2, MgO, Mg2TiO4, Mg2B2O5, Fe3Al, FeAl and Ti2B5.（3） It showed that the coating could protect ferroalloy crucible from being

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metal corrosion protection,metal surface treatment > Corrosion control and protection
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