PENGARUH pH LARUTAN NaCl DENGAN INHIBITOR ASAM ASKORBAT 200 ppm DAN PELAPISAN CAT EPOXY TERHADAP LAJU KOROSI BAJA KARBON RENDAH

Corrosion is defined as the destruction or deterioration of a material because of reaction with its environment. Corrosion can be fast or slow because effect of solution pH. Corrosion rate can be reduced by paint coating. The purpose of this research were: (1) To investigated the effect of NaCl solution pH with 200 ppm Ascorbic Acid inhibitor to low carbon steel corrosion rate. (2) To investigated the effect of epoxy paint coating to low carbon steel corrosion rate. (3) To investigated the effect of NaCl solution pH with 200 ppm Ascorbic Acid inhibitor and epoxy paint coating to low carbon steel corrosion rate. This research used experimental method. The population which used low carbon steel plate with a length 5 m size 3 x 40 mm, while the sample made with size 3 x 20 x 30 mm. Data was discovered by measured weight loss of low carbon steel with epoxy paint coating and without coating after submerison in NaCl solution with 200 ppm Ascorbic Acid inhibitor at pH value 6, 7, and 8 during 240 hours. Weight loss score was entered to formula for calculate the corrosion rate. Data which discovered from experiment result was entered to the table, and was showed in graphics and then was analyticted by description analysis. Based on this research can be concluded: (1) NaCl solution pH with 200 ppm Ascorbic Acid inhibitor cause low carbon steel corrosion rate be different. Low carbon steel in NaCl solution with pH 7 or neutral has the lowest corrosion rate, while in pH 6 of acidic although pH 8 or alkaline corrosion rate becomes higher. (2) Epoxy paint coating causes the corrosion rate of low carbon steel in NaCl solution with 200 ppm Ascorbic Acid inhibitor is lower than without coating. (3) Epoxy paint coating on low carbon steel causes corrosion rate was the lowest in NaCl solution with 200 ppm Ascorbic Acid inhibitor which has a pH value of 7 or neutral, while the conditions are acidic or alkaline solution the corrosion rate becomes higher