CAJ | 학술논문

目的：计算不同浸水率试样的平均腐蚀速率，并与全浸条件下的腐蚀行为进行对比研究。方法采用电化学测量技术，测量不同干湿循环后试样在海水中的开路电位、极化电阻和电化学交流阻抗，分析不同浸水率对低合金钢电化学性能的影响。利用三维视频显微镜观察不同浸水率试样的腐蚀形貌，采用X射线分析仪分析锈层组成。结果干湿交替条件下低合金钢的腐蚀速率比全浸条件下增大1个数量级，自腐蚀电位正移150 mV左右，极化电阻增大2个数量级；且随着浸水率增大，腐蚀速率减小，自腐蚀电位无明显变化，试验初期电阻增大，但是试验后期无明显变化。结论观察腐蚀形貌和锈层组成，全浸条件下以FeOOH为主，干湿交替条件下出现较多的Fe3 O4。
목적：계산불동침수솔시양적평균부식속솔，병여전침조건하적부식행위진행대비연구。방법채용전화학측량기술，측량불동간습순배후시양재해수중적개로전위、겁화전조화전화학교류조항，분석불동침수솔대저합금강전화학성능적영향。이용삼유시빈현미경관찰불동침수솔시양적부식형모，채용X사선분석의분석수층조성。결과간습교체조건하저합금강적부식속솔비전침조건하증대1개수량급，자부식전위정이150 mV좌우，겁화전조증대2개수량급；차수착침수솔증대，부식속솔감소，자부식전위무명현변화，시험초기전조증대，단시시험후기무명현변화。결론관찰부식형모화수층조성，전침조건하이FeOOH위주，간습교체조건하출현교다적Fe3 O4。
Objective To calculate the average corrosion rate of samples with different wet-dry ratios, and to compare with the corrosion behavior under full immersion condition. Methods Open circuit potential, polarization resistance and electrochemical impedance of the samples in seawater were measured after various wet-dry cycles using electrochemical measurement method, and the effects of wet-dry ratio on the electrochemical properties of low alloy steel were analyzed. 3-D video microscopy was used to observe the corrosion morphology of samples with different wet-dry ratios, and X-Ray Dif-fraction was applied to analyze the composition of the rust-layer. Results The results showed that the corrosion rate of low alloy steel was increased by an order of magnitude, the free corrosion potential had a positive shift of 150 mV, and the po-larization resistance was increased by two orders of magnitude under the wet-dry alternating condition comparing with that under full immersion in seawater. With the increase of the wet-dry ratio, the corrosion rate declined, and the free corrosion potential had no obvious change. Moreover, the polarization resistance increased at the early test stage, while there was no obvious change at the later stage. Conclusion Observation of corrosion morphology and rust-layer composition showed that the corrosion products under full immersion condition were mainly composed of FeOOH, while the amount of Fe3 O4 was higher under dry-wet alternating condition.