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http://dx.doi.org/10.14773/cst.2011.10.5.180

Study on the Effects of Environmental Parameters on High Temperature Denting Behavior in Crevices  

Kim, Myong-Jin (Dpt. of Quantum Energy Chemical Engineering, University of Science & Technology)
Kim, Joung Soo (Nuclear Materials Research Division, Korea Atomic Energy Research Institute)
Kim, Dong Jin (Nuclear Materials Research Division, Korea Atomic Energy Research Institute)
Kim, Hong Pyo (Nuclear Materials Research Division, Korea Atomic Energy Research Institute)
Publication Information
Corrosion Science and Technology / v.10, no.5, 2011 , pp. 180-188 More about this Journal
Abstract
In the present study, denting corrosion experiments were performed as a function of crevice gap size (50, 100 and 200 ${\mu}m$) in a solution containing 3,500 ppm NaCl + 0.2 M $CuCl_2$ (pH = 3 adjusted by HCl). The effects of chloride ion concentrations (3, 3,500 and 35,000 ppm as NaCl) were also outlined with two different crevice gap sizes (100, 200 ${\mu}m$). In addition, the effect of NiB on the denting corrosion was also investigated in a solution of 35,000 ppm NaCl + 0.2 M $CuCl_2$ (pH = 3 adjusted by HCl). The results showed that denting rate increased with the increasing crevice gap size at an initial stage and became nearly constant afterwards. As the concentration of chloride ion increased, the denting rate also increased. However, the addition of a NiB powder of 4 g/L in to the acid-chloride solution was observed to suppress the denting rate significantly.
Keywords
denting; crevice gap size; chloride ion concentration; NiB;
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