Effect of Fe, Ni and Cr on the corrosion behaviour of hypereutectic Al-Si automotive alloy in 3.5% NaCl solution at different temperature and velocity
Effect of Fe, Ni and Cr on the corrosion behaviour of hypereutectic Al-Si automotive alloy in 3.5% NaCl solution at different temperature and velocity
复制标题
效果%20of%20Fe,%20Ni%20and%20Cr%20on%20%20腐蚀%20行为%20of%20过共晶%20Al-Si%20汽车%20合金%20in%203.5%%20NaCl%20溶液%20at%20不同%20温度%20and%
DOI：
10.3329/jme.v48i1.41083
复制
发表时间：
2019
影响因子：
--
通讯作者：
M. A. Nur
中科院分区：
文献类型：
--
作者：
M. S. Kaiser;S. H. Sabbir;M. Rahman;M. S. Kabir;M. A. Nur
本研究的主要重点是检查和评估 Fe、Ni 和 Cr 对过共晶 Al-Si 汽车合金在 3.5% NaCl 溶液中腐蚀行为的影响。实验信息是通过不同溶液温度和速度下的传统重力测量获得的，并辅以电阻率、光学显微照片、扫描电子显微镜 (SEM) 和 X 射线分析仪 (EDX) 研究。由于表面上形成了非常薄的氧化铝和氢氧化物薄膜，所有合金都表现出负腐蚀速率。合金中的金属间颗粒在钝化中起主要作用。
温度会加速钝化膜的腐蚀和更快的分解速度。它还会影响合金的电阻率。这项研究的结果还表明，由于化学反应速率较高，温度和速度会增加合金的负腐蚀速率。 SEM 和 EDX 分析表明表面由一层薄薄的氧化铝和氢氧化物腐蚀产物组成。
The main focus of this study is to examine and evaluate the effect of Fe, Ni and Cr on the corrosion behaviour of hypereutectic Al-Si automotive alloy in 3.5% NaCl solution. Experimental information are attained using conventional gravimetric measurements under different solution temperature and velocity and complemented by resistivity, optical micrograph, scanning electron microscopy (SEM) and X-ray analyzer (EDX) investigations. All the alloys show the negative corrosion rate due to formation of a very thin film of aluminum oxide and hydroxid on the surface. Intermetallic particles in the alloys play a major role in passivity.
Temperature accelerates the corrosion and the higher velocity breakdown of the passive film. It also affects the resistivity of the alloys. The results from this study also indicate that the temperature and velocity increase the negative corrosion rate of the alloys due to higher rate of chemical reactions. SEM and EDX analysis indicate that the surfaces compose with a thin layer of aluminum oxide and hydroxide corrosion products.