PENGARUH KONSENTRASI INHIBITOR ASAM ASKORBAT DAN KONSENTRASI LARUTAN NATRIUM KLORIDA TERHADAP LAJU KOROSI BAJA KARBON RENDAH PASCA PELAPISAN CAT EPOXY

Abstract

            The purpose of this study was to investigate (1) Effect of the concentration ascorbic acid (AA) in a solution NaCl on the corrosion rate low carbon steel after coating process of epoxy paint. (2) Effect of NaCl concentration on the corrosion rate low carbon steel after coating process of epoxy paint. (3) Interaction of the effect between the inhibitor concentration AA with NaCl concentration on the corrosion rate low carbon steel after coating process of epoxy paint. The study is an experimental study. The reseach procedure uses four steps of preparation, experimentation and data collection, data analysis, conclusions. The research site in Polytecnic Manufacturing Ceper and Laboratory Faculty of Chemistry UNS. This study uses a 3x5 factorial experimental design. The population of the research was low carbon steel after coating process of epoxy paint. The sample of the research was AISI 1006 low carbon steel after coating process of epoxy paint. The sampling technique using random sampling. The experimental treatments with three replicate that using 45 samples. The method of data collection used in study is the experimental method. The results of this study are: (1) There is an influence of variation concentration of inhibitor AA to the corrosion rate of low carbon steel after coating process of epoxy paint, the addition of AA with a concentration below 100 ppm is increase the corrosion rate, whereas the addition of AA with a concentration above 100 ppm is decrease the corrosion rate. (2) There is an influence of NaCl concentration to the corrosion rate of low carbon steel after coating process of epoxy paint. The concentration of NaCl is directly proportional to the corrosion rate of low carbon steel after coating process of epoxy paint. (3) There is interaction effect between AA concentration of NaCl concentration on the rate of corrosion of low carbon steel after coating epoxy paint. The addition of AA concentration is directly proportional to the concentration of NaCl.