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Effect of heat flux on metal corrosion in non-boiling media: testing system, heat transfer simulations, and corrosion study on Al alloy
Corrosion Engineering, Science and Technology ( IF 1.5 ) Pub Date : 2022-09-23 , DOI: 10.1080/1478422x.2022.2126084
Cheng Wen 1 , Qianwen Zhang 1 , Kai Qi 1 , Zhenyu Chen 1 , Yubing Qiu 1 , Xingpeng Guo 1, 2
Affiliation  

ABSTRACT

A dual-circulation testing system was constructed to study the effect of heat flux density (q, −22.28 ∼ +22.54 kW m-2) on the corrosion of an Al–Cu–Mg–Mn alloy in 0.5 M H2SO4 at a constant metal surface temperature (50°C) under different controlling heat transfer states. Their heat transfer parameters were determined quantitatively by COMSOL simulation to keep them except q in constant, highlighting the influence of q on metal corrosion. Compared with the q = 0 condition, the positive heat flux (q > 0) improved the surface layer performance of the Al alloy to inhibit its anodic corrosion process, decreasing its corrosion current density (icorr) by 56% with increasing q to 22.54 kW m-2. While q < 0, the opposite effect occurred, increasing its icorr by 52% at q = −22.28 kW m-2. Heat flux also changed the corrosion reaction’s apparent effective activation energy (Ea) and pre-factor, and Ea played a dominating role in changing icorr.



中文翻译:

非沸腾介质中热通量对金属腐蚀的影响:测试系统、传热模拟和铝合金腐蚀研究

摘要

构建双循环测试系统以研究热流密度 ( q , −22.28 ∼ +22.54 kW m -2 ) 对 Al–Cu–Mg–Mn 合金在 0.5 MH 2 SO 4中腐蚀的影响在不同的控制传热状态下金属表面温度恒定(50°C)。它们的传热参数通过 COMSOL 模拟定量确定,以保持除q以外的参数恒定,突出q对金属腐蚀的影响。与q  = 0 条件相比,正热通量(q > 0) 改善了铝合金的表面层性能以抑制其阳极腐蚀过程,随着q增加到 22.54 kW m -2 ,其腐蚀电流密度 ( i corr ) 降低了 56% 。当q  < 0 时,会出现相反的效果,在q  = −22.28 kW m -2时将其i corr增加 52% 。热通量还改变了腐蚀反应的表观有效活化能( E a )和预因子,其中E a对i corr的变化起主导作用。

更新日期:2022-09-23
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