크롬 프리 친환경 유/무기 하이브리드 코팅액에 의한 냉연강판의 내식특성

• Published in: Han-guk haeyang gonghak hoeji (Online) Vol. 27; no. 2; pp. 33 - 38
• Main Authors: 남기우(Ki Woo Nam), 김정량(Jung Ryang Kim), 최창민(Chang Min Choi)
• Format: Journal Article
• Language: Korean
• Published: 한국해양공학회 2013
• Subjects: 해양공학; Organic/inorganic hybride solution 유/무기 하이브리드 용액; Heat treatment time and temperature 열처리 시간과 온도; Corrosion resistance 내부식성; /
• ISSN: 1225-0767; 2287-6715

In the past, a very popular method for reducing the corrosion on zinc involved the use of chemical conversion layer coatings based on $Cr^{+6}$. However, there is an important problem with using chromium salts as a result of restrictive environmental protection legislation. This study investigated the optimum condition for galvanized steel using an organic/inorganic solution with a Ti composition. In the case of a fixed heat treatment time, the corrosion resistance values of LR-0727(1) and LR-0727(2) were improved as the heat treatment temperature increased, and the optimum minimum temperature decreased with the heat treatment time. At the optimum heat treatment condition of two coating solutions, the heat treatment time of the LR-0727(1) solution was shorter than LR-0727(2) for the same heat treatment temperature. LR-0727(1) coated specimens did not show desquamation, and all of the specimens showed a good adhesive property. In contrast, in the case of the LR-0727(2) coated specimens, desquamation arose. Therefore, the adhesive property of LR-0727(1) was superior to that of LR-0727(2). The pencil hardness had a 3H average for all of the coating solutions and heat treatment conditions. In the case of a corrosion resistance test with boiling water, the coated specimens of LR-0727(1) were discolored, but LR-0727(2) was not. Finally, LR-0727(1) was more moisture proof than LR-0727(2).