Analisis Laju Korosi Baja Tahan Karat SS304 dan SS316 dalam Larutan Natrium Hidroksida pada Berbagai Kondisi Temperatur dan Kecepatan Pengadukan
DOI:
https://doi.org/10.59024/jisi.v4i2.1942Keywords:
kecepatan pengadukan, laju korosi, NaOH, SS304, SS316Abstract
Korosi pada material stainless steel dalam lingkungan basa dan temperatur tinggi menjadi salah satu faktor yang memengaruhi umur pakai peralatan pada sistem netralisasi minyak sawit. Penelitian ini bertujuan menganalisis pengaruh temperatur dan kecepatan pengadukan terhadap laju korosi serta membandingkan ketahanan korosi baja tahan karat SS304 dan SS316 dalam larutan NaOH 1 M. Pengujian dilakukan menggunakan metode weight loss berdasarkan standar ASTM G31–72 selama 49 hari dengan variasi temperatur 70°C, 90°C, dan 110°C serta kecepatan pengadukan 100 rpm, 200 rpm, dan 300 rpm. Laju korosi dihitung berdasarkan kehilangan massa spesimen dan dianalisis menggunakan klasifikasi ketahanan korosi. Hasil penelitian menunjukkan bahwa peningkatan temperatur dan kecepatan pengadukan menyebabkan peningkatan laju korosi pada kedua material. Nilai laju korosi tertinggi diperoleh pada SS304 sebesar 0,0247 mm/tahun pada kondisi 110°C dan 300 rpm, sedangkan nilai terendah diperoleh pada SS316 sebesar 0,0124 mm/tahun pada kondisi 70°C dan 100 rpm. Secara umum, SS316 menunjukkan ketahanan korosi yang lebih baik dibandingkan SS304 karena kemampuan mempertahankan lapisan pasif yang lebih tinggi. Berdasarkan klasifikasi ketahanan korosi, sebagian besar kondisi pengujian berada pada kategori sangat baik sehingga kedua material masih layak digunakan pada sistem netralisasi minyak sawit, dengan SS316 lebih direkomendasikan untuk kondisi operasi yang lebih agresif.
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