目的：介绍耦合多电极矩阵传感技术的工作原理及系统组成,研究16 MnR钢在轻集料混凝土和膨润土填埋环境下的腐蚀规律。方法将腐蚀探头埋于轻集料混凝土和膨润土两种户外填埋环境中,研究16 MnR钢在两种环境中的腐蚀规律；采用实验室包裹块形式进行干湿交替加速腐蚀,研究加速试验方法的加速效果。结果16MnR钢在膨润土和轻集料混凝土中的年平均局部腐蚀速率分别为23.7μm/a和0.11μm/a；在干湿交替加速腐蚀条件下,膨润土环境的平均腐蚀速率为109.1μm/a,轻集料混凝土环境的平均局部腐蚀速为1.7μm/a。结论16MnR钢在膨润土环境下的局部腐蚀速率与环境温度的变化趋势相同；轻集料混凝土对16 MnR钢的腐蚀防护效果优于膨润土。采用干湿交替加速腐蚀方法,16 MnR钢在轻集料混凝土和膨润土环境的腐蚀效果分别提高了17倍和5倍。
ABSTRACT:Objective To introduce the operating principle and system composition of coupled multielectrode array sensors (CMAS) , and study the corrosion law of 16MnR steels buried in light aggregate concrete and bentonite. Methods The corrosion monitors were buried in outdoor environments of light aggregate concrete and bentonite, to study the corrosion law of 16MnR steels in these two surroundings. The speedup of dry-wet alternate accelerated corrosion was studied in lab by burying the detectors in la-boratory wrapped pieces. Results The annual average localized corrosion rate of 16MnR steels was 23. 7 μm/a and 0. 1 μm/a in bentonite and light aggregate concrete, respectively. The average localized corrosion rate of 16MnR steels in bentonite and light ag-gregate concrete was 109. 1μm/a and 1. 7μm/a respectively by dry-wet alternate accelerated corrosion. Conclusion The localized corrosion rate of 16MnR steels in bentonite changed with the environment temperature. The light aggregate concrete had better cor-rosion prevention effect than bentonite on 16MnR steels. The accelerated ratios of dry-wet alternate accelerated corrosion were ap-proximately 17 and 5 in light aggregate concrete and bentonite, respectively.
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