PENGARUH PENGARUH JARAK SPRAY COATING PADA BAJA SS400 TERHADAP LAJU KOROSI DI LAUT

Abstract

Steel is an alloy metal containing iron as its main element and carbon as its main alloying element. The carbon content in steel varies from 0.2% to 2.1% depending on its quality, but despite its widespread and extensive use, steel is highly susceptible to corrosion. PT. Pelindo Marine Service III has taken measures to reduce the rate of corrosion by applying a coating to the steel using rolling techniques and Saver 266 paint; however, corrosion still occurs at certain points. Corrosion cannot be completely stopped and can only be controlled (reduced). One type of protective coating for metal is spray coating. The objective of this study is to gain a deeper understanding of spray coating on the durability of coated materials. The spray coating was applied to the steel plates twice. Variations in distance of 10 cm, 20 cm, and 30 cm with a pressure of 5 bar were used to observe the durability and protection against corrosion rates after coating and immersion in a 3.5% NaCl corrosive solution. The corrosion rate test using the weight loss method yielded the slowest corrosion rate at a distance of 10 cm and a pressure of 5 bar, with a value of 0.43 mpy, and the fastest corrosion rate at a distance of 30 cm and a pressure of 5 bar, with a value of 1.04 mpy.