Perbandingan Korosi Pada Baja Karbon AISI 1018 Menggunakan Lapisan Cat Enamel Dan Cat Akrilik Dalam Larutan Nacl Dengan Konsentrasi 3,5%

Yuliana Simons; Muhammad Khaithir Haidar; Ferdi Pratama; Mikhel Albert John

doi:10.52158/jamere.v6i2.1704

Authors

Yuliana Simons Universitas Balikpapan
Muhammad Khaithir Haidar Universitas Balikpapan
Ferdi Pratama Universitas Balikpapan
Mikhel Albert John Universitas Balikpapan

DOI:

https://doi.org/10.52158/jamere.v6i2.1704

Keywords:

AISI 1018, Acrylic Paint, Corrosion, Enamel Paint, Immersion Test, 3.5% NaCl.

Abstract

Low-carbon steel AISI 1018 is widely used in various industrial applications, but it exhibits high susceptibility to corrosion, particularly in chloride-rich marine environments. This study aims to analyze and compare the corrosion resistance of AISI 1018 carbon steel coated with enamel paint and acrylic paint, as well as comparing them with uncoated (raw material) specimens. The experimental method applied was an immersion test in a 3.5% Sodium Chloride (NaCl) solution over varying exposure durations of 7, 14, 21, 28, and 31 days. Macroscopic visual observations were conducted to identify degradation mechanisms and corrosion product formation on the specimen surfaces. The results revealed that the uncoated specimens underwent uniform corrosion from the initial immersion period, forming a thick dark greyish-black iron oxide layer (Fe₃O₄). The acrylic paint coating suffered severe protection failure due to extensive underfilm corrosion, evidenced by orange-brown rust products (Fe₂O₃.H₂O) covering the entire surface as a result of high paint porosity. In contrast, enamel paint demonstrated the most optimal physical protection performance, maintaining coating integrity on the main surface up to day 31, with degradation restricted to localized edge corrosion. Consequently, enamel paint is more recommended as a protective coating for AISI 1018 steel in chloride environments compared to acrylic paint.

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