Waled Elthalabawy Tahir Khan
材料科学技术（英）
The excellent corrosion resistance, formability and strength make stainless steels versatile for diverse applications. However, its high specific strength and good crashworthiness make it suitable for transportation and aerospace industry. On the other hand, the need to reduce the weight of vehicle and aerospace components has created renewed interest in the use of magnesium alloys. Due to their differences in physical and metallurgical
properties, bonding of the 316L steel and AZ31 magnesium alloy using conventional fusion welding methods encountered many limitations. Therefore, the use of liquid phase forming interlayers is required to overcome the differences in their properties, eliminates the need for a high bonding pressure to achieve intimate contact between the bonded surfaces. Both Cu and Ni interlayers successively formed a eutectic phase with magnesium. The formation of intermetallics and Mg diffusion caused the eutectic phase to isothermally solidify with increasing bonding time. The formation of ternary intermetallic phases (λ1 and B2) impaired the bond shear strength particularly at the end of the isothermal solidification stage where no eutectic phase was observed.
However, the joints showed a higher shear strength value of 57 MPa when bonding with Cu interlayer at 530°C for 30 min compared to 32 MPa when Ni interlayer was used at 510°C for 20 min.
关键词:
Magnesium alloy
,
Stainless steel
,
Eutectic Bonding
,
Microstructure
,
Shear strength
薛华实
,
徐乃欣
,
张承典
,
陈月贞
,
沈怡韵
中国腐蚀与防护学报
针对活性γ型宫内节育器,研究了在pH6～8的生理盐水中消炎痛对铜与不锈钢的电偶腐蚀的影响。消炎痛不影响铜的自然腐蚀电位及其随溶液pH的升高而正移的规律;它使不锈钢的自然腐蚀电位略有正移,但不改变其随溶液pH的升高而负移的趋势。对于铜/不锈钢电偶,消炎嫡不改变铜的阳极行为,但使不锈钢的阴极极化曲线正移;添加消炎痛使电偶电流明显增大。不锈钢可能出现活化状态,这时如与铜偶合,铜就成为阴极,从而抑制铜的腐蚀。消炎痛虽使不锈钢的电位略有正移,但不改变它原来的钝化状态或活化状态。
关键词:
电偶腐蚀
,
Copper
,
Stainless steel
,
Indomethacin
,
Intrauterine device
Jiangang Zhang
材料科学技术（英）
Stainless steel plates were successfully coated with SnO2-CeO2 films (SS/SnO2-CeO2) by brush coating with a solution of stannous chloride and cerium trichloride followed by thermal decomposition. It is proven that the properties of SnO2 films can be evidently improved by Ce doping, and 600°C is the optimum temperature to prepare SS/SnO2-CeO2 anodes. The physicochemical and electrochemical properties as well as the electrocatalytic activity of the electrodes were investigated. It is found that the novel electrodes have compact microstructure, high overpotential for oxygen evolution (1.60 V vs SCE), excellent electrochemical stability, relatively low cost and excellent catalytic activity for oxidizing pollutants. An industrial dye wastewater, which is hard to be purified by using conventional chemical flocculation methods, was oxidated by employing the SS/SnO2-CeO2 anodes, and 83.00% of color and 48.62% of chemical oxygen demand (COD) removal was achieved under the cell voltage of 5 V within only 2 min, and the electricity consumption is only 1.83 kWh for oxidizing 1 m3 of dye wastewater.
关键词:
SnO2-CeO2 anodes
,
不锈钢
,
电化学氧化
,
染料废水
Esmaeil Jafari
材料科学技术（英）
The influence of deformation temperature, strain rate and alloying elements such as chromium, nickel, copper, on corrosion resistance of a 304 stainless steel after plastic deformation was investigated. The techniques employed were tensile test at room and elevated temperature, deep drawing tests at various strain rates, X-ray diffraction test and potentiodynamic and cyclic polarization, metallography by optical and scanning electron microscopy. Results showed that chromium, nickel and copper had a significant effect on corrosion resistance of steel after plastic deformation. It was observed that corrosion resistance after plastic deformation was a function of deformation temperature and alloying elements.
关键词:
Corrosion resistance
,
Plastic Deformation
,
Stainless Steel
,
Phase Transformation
,
Polarization Test
