CAJ | 학술논문

采用电化学阻抗谱、电化学噪声和扫描电镜等技术研究了纯铜、铜/钛耦合电极在模拟海水中的腐蚀行为。结果表明：纯铜的腐蚀过程分2个阶段，其腐蚀阻抗和点蚀参数SE均遵循先增后降的规律，而其腐蚀参数SG的变化规律则正好相反；铜/钛耦合电极的腐蚀过程则由3个阶段组成，其腐蚀阻抗和点蚀参数SE均遵循先降后升到最后再降的规律，而其腐蚀参数 SG则同样反向变化。铜和钛之间的电势差加速了纯铜的点蚀萌生，同时铜/钛耦合电极的腐蚀电位总是正于纯铜的腐蚀电位。
채용전화학조항보、전화학조성화소묘전경등기술연구료순동、동/태우합전겁재모의해수중적부식행위。결과표명：순동적부식과정분2개계단，기부식조항화점식삼수SE균준순선증후강적규률，이기부식삼수SG적변화규률칙정호상반；동/태우합전겁적부식과정칙유3개계단조성，기부식조항화점식삼수SE균준순선강후승도최후재강적규률，이기부식삼수 SG칙동양반향변화。동화태지간적전세차가속료순동적점식맹생，동시동/태우합전겁적부식전위총시정우순동적부식전위。
The corrosion behaviors of copper and copper/titanium galvanic couple (GC) in seawater were studied by electrochemical impedance spectroscopy (EIS) and electrochemical noise (EN) techniques in conjunction with scanning electron microscopy (SEM) method. The results show that the corrosion process of copper in seawater can be divided into two stages, in which corrosion resistance and SE show the same evolution trend of initial increase and subsequent decrease, while SG changes oppositely. However, the ensemble corrosion process of copper/titanium GC in seawater includes three stages, in which corrosion resistance and SE show the evolution features of initial decrease with a subsequently increase, and the final decrease again;while SG changes oppositely. The potential difference between copper and titanium in their galvanic couple can accelerate the initiation of pitting corrosion of copper, and both the minimum and maximum corrosion potentials of copper/titanium GC are much more positive than those of pure copper.