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Multifaceted study of the galvanic corrosion behaviour of titanium-TC4 and 304 stainless steel dissimilar metals couple in deep-sea environment
Electrochimica Acta ( IF 5.5 ) Pub Date : 2025-01-25 , DOI: 10.1016/j.electacta.2025.145753
Bright O. Okonkwo, Zimin Li, Li Li, Yimian Chen, Jing Li, Wanqing You, Zhiming Zhang, Jianqiu Wang, En-Hou Han
Electrochimica Acta ( IF 5.5 ) Pub Date : 2025-01-25 , DOI: 10.1016/j.electacta.2025.145753
Bright O. Okonkwo, Zimin Li, Li Li, Yimian Chen, Jing Li, Wanqing You, Zhiming Zhang, Jianqiu Wang, En-Hou Han
In this study, the individual corrosion results of the dissimilar metals revealed that at the onset of exposure to simulated deep-sea environment of 5000 m sea depth, the corrosion potential of 304 SS (-148 mV vs Ag/AgCl) was more positive than that of TC4 (-191 mV vs Ag/AgCl). However, with the progress in exposure time beyond 37.3 ks, the corrosion potential of TC4 became more positive than that of 304 SS, and remained so till the end of the OCP test. Notwithstanding the corrosion potential results, the coupling results showed three conspicuously distinct phenomena. First, upon coupling in the area ratio Aa/Ac 1:1, anode to cathode reversal behaviour occurred between both materials at 64.6 ks of exposure time. However, overall, TC4 was observed to be the less corroding material. Second, coupling in the area ratio Aa/Ac 5:1, TC4 with a smaller area acted as the cathode for the entire duration of the coupling, while 304 SS acted as the anode. Third, coupling in the area ratio Aa/Ac 1:5 showed that TC4 with a larger area acted as the anode, while 304 SS acted as the cathode. These distinct behaviours of the galvanic couple indicates that area ratio has a tremendous effect on the corrosion behaviour of both coupled alloys. Overall, it was noticed that when 304 SS is corroding, the corrosion is more deleterious because it takes the forms of both localized and general corrosion, as against the general corrosion form of TC4 in a case where its acting as the corroding anode metal.
中文翻译:
钛-TC4 和 304 不锈钢异种金属偶在深海环境中电偶腐蚀行为的多方面研究
在这项研究中,异种金属的单个腐蚀结果表明,在暴露于 5000 m 海深的模拟深海环境中时,304 SS(-148 mV vs Ag/AgCl)的腐蚀电位比 TC4 的腐蚀电位(-191 mV vs Ag/AgCl)更积极。然而,随着暴露时间超过 37.3 ks,TC4 的腐蚀电位变得比 304 SS 更正,并一直保持到 OCP 测试结束。尽管存在腐蚀电位结果,但耦合结果显示了三种明显不同的现象。首先,在面积比 A a /A c 1:1 耦合时,在 64.6 ks 的曝光时间下,两种材料之间发生了阳极到阴极的反转行为。然而,总体而言,观察到 TC4 是腐蚀性较小的材料。其次,面积比为 A a /A c 5:1 的耦合,面积较小的 TC4 在整个耦合过程中充当阴极,而 304 SS 充当阳极。第三,面积比 A a /A c 1:5 的耦合表明,面积较大的 TC4 充当阳极,而 304 SS 充当阴极。电偶的这些不同行为表明,面积比对两种耦合合金的腐蚀行为有巨大影响。总体而言,人们注意到,当 304 SS 腐蚀时,腐蚀的危害更大,因为它同时表现为局部腐蚀和一般腐蚀,而 TC4 的一般腐蚀形式是它充当腐蚀阳极金属。
更新日期:2025-01-29
中文翻译:
钛-TC4 和 304 不锈钢异种金属偶在深海环境中电偶腐蚀行为的多方面研究
在这项研究中,异种金属的单个腐蚀结果表明,在暴露于 5000 m 海深的模拟深海环境中时,304 SS(-148 mV vs Ag/AgCl)的腐蚀电位比 TC4 的腐蚀电位(-191 mV vs Ag/AgCl)更积极。然而,随着暴露时间超过 37.3 ks,TC4 的腐蚀电位变得比 304 SS 更正,并一直保持到 OCP 测试结束。尽管存在腐蚀电位结果,但耦合结果显示了三种明显不同的现象。首先,在面积比 A a /A c 1:1 耦合时,在 64.6 ks 的曝光时间下,两种材料之间发生了阳极到阴极的反转行为。然而,总体而言,观察到 TC4 是腐蚀性较小的材料。其次,面积比为 A a /A c 5:1 的耦合,面积较小的 TC4 在整个耦合过程中充当阴极,而 304 SS 充当阳极。第三,面积比 A a /A c 1:5 的耦合表明,面积较大的 TC4 充当阳极,而 304 SS 充当阴极。电偶的这些不同行为表明,面积比对两种耦合合金的腐蚀行为有巨大影响。总体而言,人们注意到,当 304 SS 腐蚀时,腐蚀的危害更大,因为它同时表现为局部腐蚀和一般腐蚀,而 TC4 的一般腐蚀形式是它充当腐蚀阳极金属。