Effect of pulse cathodic protection on corrosion mitigation and electrochemical conditions under a simulated coating disbondment on pipeline steel,Materials and Corrosion

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Effect of pulse cathodic protection on corrosion mitigation and electrochemical conditions under a simulated coating disbondment on pipeline steel
Materials and Corrosion ( IF 1.6 ) Pub Date : 2021-09-16 , DOI: 10.1002/maco.202112490
Hossein Najafi ₁ , Abdoulmajid Eslami ₁ , Mohammad A. Golozar ₁ , Amin Kavian ₂ , Mahdi Ahmadi ₂

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Coating disbondments on pipeline steels are regions with high resistivity where conventional cathodic protection (CP) could not fully protect. Therefore, in an attempt to mitigate this challenge, this study investigates the effect of pulse CP on corrosion mitigation and electrochemical conditions under a simulated coating disbondment on X-52 pipeline steel. In this regard, conventional and pulse CP of −870 mV_SCE were applied to the open mouth of a simulated coating disbondment. For pulse CP, frequencies of 1, 5, and 10 kHz were used. Results showed while the conventional CP was not able to fully protect the 20 cm simulated coating disbondment, for the pulse CP with increase in frequency from 1 to 5 kHz, and from 5 to 10 kHz, improve in CP potential protection under the simulated coating disbondment was achieved. This was accompanied by considerably lower corrosion and a more uniform pH distribution under the simulated coating disbondment.

中文翻译：

在模拟管线钢涂层剥离下脉冲阴极保护对缓蚀和电化学条件的影响

管线钢上的涂层剥离是常规阴极保护 (CP) 无法完全保护的高电阻区域。因此，为了缓解这一挑战，本研究通过模拟 X-52 管线钢的涂层剥离来研究脉冲 CP 对缓蚀和电化学条件的影响。在这方面，-870 mV _{SCE 的}常规和脉冲 CP应用于模拟涂层剥离的开口。对于脉冲 CP，使用了 1、5 和 10 kHz 的频率。结果表明，虽然常规 CP 不能完全保护 20 cm 模拟涂层剥离，但对于频率从 1 kHz 到 5 kHz 和从 5 kHz 增加到 10 kHz 的脉冲 CP，在模拟涂层剥离下提高了 CP 电位保护已实现。在模拟涂层剥离下，这伴随着相当低的腐蚀和更均匀的 pH 分布。

更新日期：2021-09-16

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