论文部分内容阅读
利用微电极原位测量技术和电化学噪声技术研究了5083和6061铝合金的缝隙腐蚀行为,探讨了材料的显微组织与缝隙腐蚀行为之间的相关性。结果表明,6061铝合金从缝口到缝隙内部局部腐蚀的趋势逐渐增强,对6061铝合金缝隙腐蚀起主导作用的是IR降机制;5083铝合金距缝口远处的腐蚀形态趋近局部腐蚀,距缝口近处趋近均匀腐蚀,缝隙内成分变化机制是5083铝合金缝隙腐蚀的主导因素。不同类型第二相的微电偶作用是5083和6061铝合金的缝隙腐蚀行为以及遵循的腐蚀机制不同的原因。
The crevice corrosion behavior of 5083 and 6061 aluminum alloy was studied by in-situ microelectrode measurement technique and electrochemical noise technique, and the correlation between the microstructure and crevice corrosion behavior was discussed. The results show that the local corrosion tendency of 6061 aluminum alloy gradually increases from the slit to the crevice, and the mechanism of IR drop is the dominant effect on the crevice corrosion of 6061 aluminum alloy. The corrosion pattern of 5083 aluminum alloy near the seam mouth is close to local corrosion, The distance from the seam near the uniform corrosion, cracks in the composition of the mechanism is the leading factor in 5083 aluminum alloy crevice corrosion. The micro-galvanic action of the second phase of different types is responsible for the different crevice corrosion behaviors of the 5083 and 6061 aluminum alloys and the corrosion mechanisms to be followed.