9C系列粉末冶金高耐蚀铝合金腐蚀行为研究

Corrosion Behavior of 9C Series of Powder Metallurgy Al-alloy with High Corrosion Resistance

选取了9C系列铝合金9C34 (挤压成形)和9C37 (模压成形)以及美国5083铝合金进行对比研究,通过拉伸实验及硬度测试对比评估了各铝合金力学性能,通过盐雾实验、极化曲线和阻抗谱测试考察温度和pH对3种铝合金在不同腐蚀环境中腐蚀行为的影响规律。结果表明:9C铝合金的强度可达550 MPa,硬度为130HB,都显著高于5083铝合金的。在实验的不同温度与pH腐蚀环境中,9C铝合金同时具有与美国5083铝合金相当的优异耐蚀性,作为耐腐蚀结构材料具有明显的应用优势。

The 9C series Al-alloy is a kind of Al-alloy prepared by powder metallurgy technology. In order to provide a reference for the application of 9C series Al-alloy in the marine field, two grades of 9C series Al-alloy, 9C34(extrusion forming) and 9C37(molding forming) Al-alloy were compared with 5083 Al-alloy, especially in terms of corrosion performance. The mechanical properties of the three alloys were evaluated by tensile test and hardness test, and the effect of temperature and pH on the corrosion behavior of the alloys in different corrosive environments were comparatively investigated via salt spray tests,polarization curves measurement and electrochemical impedance spectroscopy. The results show that the strength(up to 550 MPa) and hardness(up to 130 HB) of 9C Al-alloy are significantly better than that of 5083 Al-alloy. With excellent mechanical properties and high corrosion resistance, 9C series Al-alloy has obviously application prospect as corrosion-resistant structural materials.