Nickel-based superalloys with and without Co by partial replacement of W were prepared using double vacuum melting.A comparison of the oxidation in air and hot corrosion behaviors under molten 75 wt.%Na2 SO4+25 wt.%Na...Nickel-based superalloys with and without Co by partial replacement of W were prepared using double vacuum melting.A comparison of the oxidation in air and hot corrosion behaviors under molten 75 wt.%Na2 SO4+25 wt.%NaCl at 900℃were systematically investigated.The results showed that partial replacement of W with Co promoted the formation of chromia scale and consequently decreased the oxidation rate.Besides,the addition of Co also retarded the internal oxidation/nitridation of Al and consequently promoted the growth of Al_(2) O3 scale,which further decreased the scaling rate and improved the adhesion of scale.Moreover,the addition of Co also further improved the hot corrosion resistance under molten Na2 SO4-NaCl salts.展开更多
Magnesium alloys have some excellent properties such as ligh quality, high specific strength and stiffness, high damp and recoverd easily. So magnesium alloys have been used widely for the housings of automobile parts...Magnesium alloys have some excellent properties such as ligh quality, high specific strength and stiffness, high damp and recoverd easily. So magnesium alloys have been used widely for the housings of automobile parts, cellular phones and notebook computers in recent years However, a drawback due to the poor corrosion resistance of magnesium alloys has limited their engineering applications, especially when the concentrations of heavy metal impurities such as iron, nickel and copper are high. On the other hand, surface treatments are necessary to protect against corrosion because electrochemically.展开更多
基金financial supports from the Natural Science Foundation of Shandong Province,China(No.ZR2019MEE107)Shandong Jiaotong University“Climbing”Research Innovation Team Program,China(No.SDJTC1802)PhD Scientific Research Foundation of Shandong Jiaotong University,China(No.BS2018005)。
文摘Nickel-based superalloys with and without Co by partial replacement of W were prepared using double vacuum melting.A comparison of the oxidation in air and hot corrosion behaviors under molten 75 wt.%Na2 SO4+25 wt.%NaCl at 900℃were systematically investigated.The results showed that partial replacement of W with Co promoted the formation of chromia scale and consequently decreased the oxidation rate.Besides,the addition of Co also retarded the internal oxidation/nitridation of Al and consequently promoted the growth of Al_(2) O3 scale,which further decreased the scaling rate and improved the adhesion of scale.Moreover,the addition of Co also further improved the hot corrosion resistance under molten Na2 SO4-NaCl salts.
基金Supported by the National Natural Science Foundation of China （ 10275020 ）
文摘Magnesium alloys have some excellent properties such as ligh quality, high specific strength and stiffness, high damp and recoverd easily. So magnesium alloys have been used widely for the housings of automobile parts, cellular phones and notebook computers in recent years However, a drawback due to the poor corrosion resistance of magnesium alloys has limited their engineering applications, especially when the concentrations of heavy metal impurities such as iron, nickel and copper are high. On the other hand, surface treatments are necessary to protect against corrosion because electrochemically.
