Electronic Theses and Dissertation

Korosi atmosferik merupakan permasalahan signifikan dalam industri logam, terutama di wilayah beriklim tropis. Penelitian ini mengevaluasi pengaruh ketebalan cat terhadap laju korosi atmosferik pada baja siku SNI 07-2054-2006 dengan dua jenis pelapis, Nitroselulosa Base (NB) dan Alkyd Base (AB), pada ketebalan 0,05 mm hingga 0,3 mm. Uji kehilangan massa dilakukan selama tiga bulan di lingkungan terbuka.Hasil menunjukkan bahwa aplikasi cat menurunkan laju korosi secara signifikan dibandingkan dengan spesimen tanpa pelapis. Cat AB ketebalan 0,1 mm memberikan perlindungan optimal dengan laju korosi terendah (0,009 mm/y). Namun, tren perlindungan tidak linier terhadap ketebalan cat, spesimen dengan lapisan lebih tebal (≥0,2 mm) mengalami peningkatan laju korosi yang buruk. Hasil ini menunjukkan bahwa efektivitas laju korosi atmosferik termasuk dalam kategori katahanan korosi relatif (relative corrosion resistance) dalam level Excellent (0,02-0,1 mm/y) dilingkungan Fakultas Teknik, Universitas Syiah Kuala.

Atmospheric corrosion is a significant problem in the metal industry, especially in tropical regions. This study evaluates the effect of paint thickness on the atmospheric corrosion rate of SNI 07-2054-2006 angle steel using two types of coatings, Nitroselulosa Base (NB) and Alkyd Base (AB), at thicknesses ranging from 0.05 mm to 0.3 mm. Mass loss tests were conducted over three months in an open environment. The results show that the application of paint significantly reduces the corrosion rate compared to uncoated specimens. AB paint at a thickness of 0.1 mm provided optimal protection with the lowest corrosion rate (0.009 mm/y). However, the protection trend is not linear with respect to paint thickness; specimens with thicker coatings (≥0.2 mm) experienced a higher corrosion rate. These results indicate that the effectiveness of atmospheric corrosion protection falls into the category of relative corrosion resistance at an Excellent level (0.02–0.1 mm/y) in the environment of the Faculty of Engineering, Syiah Kuala University.