316L不锈钢在碳纳米管-水纳米流体中的腐蚀评估：碳纳米管负载量的影响

Corrosion Evaluation of 316L Stainless Steel in CNT-Water Nanofluid: Effect of CNTs Loading.

作者信息

Abdeen Dana H, Atieh Muataz A, Merzougui Belabbes, Khalfaoui Walid

机构信息

Sustainable Development Division, College of Science and Engineering, Hamad Bin Khalifa University, P.O. Box 34110 Doha, Qatar.

Department of Chemical Engineering, College of Engineering, Qatar University, P.O. Box 2713 Doha, Qatar.

出版信息

Materials (Basel). 2019 May 18;12(10):1634. doi: 10.3390/ma12101634.

DOI:10.3390/ma12101634

PMID:31109046

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6567303/

Abstract

Polarization resistance and potentiodynamic scan testing were performed on 316L stainless steel (SS) at room temperature in carbon nanotube (CNT)-water nanofluid. Different CNT loadings of 0.05, 0.1, 0.3 and 0.5 wt% were suspended in deionized water using gum arabic (GA) surfactant. Corrosion potential, Tafel constants, corrosion rates and pitting potential values indicated better corrosion performance in the presence of CNTs with respect to samples tested in GA-water solutions. According to Gibbs free energy of adsorption, CNTs were physically adsorbed into the surface of the metal, and this adsorption followed Langmuir adsorption isotherm type II. Samples tested in CNT nanofluid revealed a corrosion performance comparable to that of tap water and better than that for GA-water solutions. Among all samples tested in CNT nanofluids, the lowest corrosion rate was attained with 0.1 wt% CNT nanofluid, while the highest value was obtained with 0.5 wt% CNT nanofluid. At higher CNT concentrations, accumulated CNTs might form active anodic sites and increase the corrosion rate. SEM images for samples of higher CNT loadings were observed to have higher pit densities and diameters.

摘要

在室温下，于碳纳米管（CNT）-水纳米流体中对316L不锈钢（SS）进行了极化电阻和动电位扫描测试。使用阿拉伯胶（GA）表面活性剂将0.05、0.1、0.3和0.5 wt%的不同碳纳米管负载量悬浮在去离子水中。与在GA-水溶液中测试的样品相比，腐蚀电位、塔菲尔常数、腐蚀速率和点蚀电位值表明，在存在碳纳米管的情况下具有更好的腐蚀性能。根据吸附的吉布斯自由能，碳纳米管物理吸附在金属表面，且这种吸附遵循II型朗缪尔吸附等温线。在碳纳米管纳米流体中测试的样品显示出与自来水相当且优于GA-水溶液的腐蚀性能。在所有在碳纳米管纳米流体中测试的样品中，0.1 wt%的碳纳米管纳米流体的腐蚀速率最低，而0.5 wt%的碳纳米管纳米流体的腐蚀速率最高。在较高的碳纳米管浓度下，积累的碳纳米管可能形成活性阳极位点并增加腐蚀速率。观察到较高碳纳米管负载量样品的扫描电子显微镜图像具有更高的点蚀密度和直径。