ANALISIS PENGARUH BAHAN COATING PADA MATERIAL STAINLESS STEEL 316L DALAM LARUTAN ASAM SULFAT TERHADAP LAJU KOROSI

Korosi merupakan permasalahan utama yang sering terjadi pada material logam, termasuk stainless steel 316L yang dikenal memiliki ketahanan korosi tinggi. Namun, dalam lingkungan yang sangat agresif seperti larutan asam sulfat (H₂SO₄), material ini tetap berpotensi mengalami degradasi. Penelitian ini bertujuan untuk menganalisis pengaruh jenis bahan coating terhadap laju korosi pada stainless steel 316L dengan menggunakan dua jenis pelapis, yaitu epoxy novalux dan polyurethane, masing-masing dengan variasi 1 layer dan 2 layer. Metode pengujian yang digunakan adalah metode kehilangan berat (weight loss) dengan media korosif larutan asam sulfat 1 M selama 48 jam perendaman

Hasil penelitian menunjukkan bahwa penggunaan coating mampu menurunkan laju korosi secara signifikan dibandingkan dengan spesimen tanpa pelapis. Nilai laju korosi tertinggi diperoleh pada spesimen tanpa coating sebesar 2,8183 mm/y, sedangkan nilai terendah terdapat pada spesimen dengan coating epoxy novalux 2 layer sebesar 0,3247 mm/y. Pengujian foto mikro menunjukkan adanya jenis korosi seragam (uniform corrosion) dan korosi batas butir (intergranular corrosion).

Dapat disimpulkan bahwa jenis dan jumlah lapisan coating berpengaruh terhadap ketahanan korosi stainless steel 316L. Coating epoxy novalux dengan dua lapisan terbukti paling efektif dalam menahan laju korosi di lingkungan asam sulfat. Hasil penelitian ini diharapkan dapat menjadi referensi dalam pemilihan material pelindung pada industri yang beroperasi di lingkungan kimia agresif.

Corrosion is a major problem that often occurs in metal materials, including 316L stainless steel which is known to have high corrosion resistance. However, in highly aggressive environments such as sulfuric acid (H₂SO₄) solutions, this material still has the potential to degrade. This study aims to analyze the effect of the type of coating material on the corrosion rate of 316L stainless steel by using two types of coatings, namely epoxy novalux and polyurethane, each with a variation of 1 layer and 2 layers. The test method used was the weight loss method with a corrosive medium of 1 M sulfuric acid solution for 48 hours of immersion

The results showed that the use of coating was able to significantly reduce the corrosion rate compared to uncoated specimens. The highest corrosion rate value was obtained in uncoated specimens of 2.8183 mm/y, while the lowest value was found in specimens with 2-layer epoxy novalux coating of 0.3247 mm/y. Micro photo testing showed the presence of uniform corrosion and intergranular corrosion.

It can be concluded that the type and number of coating layers have an effect on the corrosion resistance of 316L stainless steel. Novalux epoxy coating with two layers has proven to be most effective in resisting corrosion rates in sulfuric acid environments. The results of this study are expected to be a reference in the selection of protective materials in industries operating in aggressive chemical environments.