덴팅거동에 미치는 고온틈새 환경변수들의 영향연구
Study on the Effects of Environmental Parameters on High Temperature Denting Behavior in Crevices
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In the present study, denting corrosion experiments were performed as a function of crevice gap size (50, 100and 200 ㎛) 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 ㎛). 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.
Abstract
In the present study, denting corrosion experiments were performed as a function of crevice gap size (50, 100and 200 ㎛) 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 ㎛). 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.
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