Influence of pH and flow on the polarisation behaviour of pure magnesium in borate buffer solutions
Influence of pH and flow on the polarisation behaviour of pure magnesium in borate buffer solutions
复制标题
DOI：
10.1016/j.corsci.2008.09.026
复制
发表时间：
2008-12-01
影响因子：
8.3
通讯作者：
Mukai, Toshiji
中科院分区：
文献类型：
--
作者：
Hiromoto, Sachiko;Yamamoto, Akiko;Mukai, Toshiji
纯镁的极化和阻抗行为的pH值和流量的影响进行了研究，在0.6重量%的NaCl硼酸盐缓冲溶液在pH值为6.7，7.6，和9.3，使用旋转电极。流动的存在阻止了腐蚀产物的积累，促进了均匀腐蚀，导致阳极电流密度的增加和阻抗的降低，而不管本体溶液的pH值。在静态条件下，pH值的影响不明显，而在动态条件下，pH值为6.7和7.6时的阳极电流密度高于pH值为9.3时的阳极电流密度。这一结果表明，通过加速离子扩散，硼酸盐缓冲液可以将表面附近的pH缓冲到本体溶液的pH。(C)2008爱思唯尔有限公司保留所有权利。
The influence of pH and flow on the polarisation and impedance behaviour of pure Mg was investigated in 0.6 wt% NaCl borate buffer solutions at pH 6.7, 7.6, and 9.3 using a rotating electrode. The existence of flow prevented the accumulation of the corrosion product and promoted uniform corrosion, leading to an increase of the anodic current density and a decrease of the impedance regardless of the pH of the bulk solution. The influence of the pH did not obviously appear under the static condition, whereas, under the dynamic condition, the anodic current density at pH 6.7 and 7.6 was higher than that at pH 9.3. This result suggests that pH near the surface can be buffered at the pH of bulk solution by borate buffer with the acceleration of ion diffusion. (C) 2008 Elsevier Ltd. All rights reserved.