The Effect of Protective Coatings using L-5A Type toward Corrosion Rate on Mild Steel Grade a Material (Case Study in Indonesia Warship)

The Indonesian Navy requires warship as the main component of defense. It most of the material used are plates. There are several materials or materials that are vulnerable when exposed to corrosive attack on the marine environment. The aim of this paper is to determine the influence of coating, characteristics and compounds corrosion mild steel material A grade toward corrosion rate in seawater environment. Characteristics and corrosion compounds, used salt spray, immersion corrosion method, and X-ray method for analyzing corrosion compounds. The result of salt spray method showed highest corrosion rate (average 7,228 mpy for 20 days). The result of highest without coating showed corrosion rate (average 52,781 mpy for 20 days). The immersion test method with painting has the highest corrosion rate (average 1,892 mpy for 10 days). The highest unpainted corrosion rate (average 4,608 mpy for 20 days) after identified using x-ray obtained analysis and element that cause corrosion. In salt sprays produce corrosion product that is Fe (CO3).