ABSTRACT

The serial-type deep-sea environmental test device was used to investigate the corrosion behaviour of 1060 aluminium exposed at real sea for 0.5 year and 2 years. Specimens were deployed at a depth of 1200, 2000 and 3000 m, respectively. A three-stage corrosion process was proposed after analysing the corrosion profile and the corrosion products of the specimens. The corrosion regularity was studied by employing the imaging processing technology and grey correlation analysis. The results show that the 1060 aluminium is prone to pitting and crevice corrosion. For the 0.5 year period test, the corrosion rate increases from 0.0114 to 0.0147 mm year⁻¹ when the sea water depth increases from 1200 to 3000 m. For the 2 year period test, the corrosion rate first decreases and then increases when the sea water depth increases from 1200 to 3000 m, and the maximum corrosion rate at 3000 m depth is 0.006 mm year⁻¹. Oxygen content and conductivity are the most important factors affecting the corrosion rate.

摘要

采用串联式深海环境试验装置，研究了1060铝在真海中暴露0.5年和2年的腐蚀行为。样本分别部署在 1200、2000 和 3000 m 的深度。通过对试样的腐蚀剖面和腐蚀产物的分析，提出了三级腐蚀工艺。采用成像处理技术和灰色关联分析方法研究腐蚀规律。结果表明，1060铝容易发生点蚀和缝隙腐蚀。对于 0.5 年周期的测试，腐蚀速率从 0.0114 增加到 0.0147 mm 年^-1当海水深度从 1200 m 增加到 3000 m 时。对于2年周期的试验，随着海水深度从1200增加到3000m，腐蚀速率先减小后增大，3000m深度处的最大腐蚀速率为0.006mm year ^-1。氧含量和电导率是影响腐蚀速率的最重要因素。