SUPRIYANTO, EDI (2025) ANALISIS LAJU KOROSI PADA BAJA KARBON SPHCPO DENGAN SIMULASI HUJAN ASAM MENGGUNAKAN METODE WEIGHT LOSS. S1 thesis, Universitas Mercu Buana Jakarta.
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Abstract
Corrosion issues in carbon steel, particularly the SPHCPO type commonly used as motorcycle frame material, are a serious concern because exposure to extreme environments such as acid rain can accelerate material degradation. This study aims to analyze the corrosion rate of SPHCPO carbon steel under artificial acid rain conditions, as well as observe surface morphology changes and ion diffusion rates during the corrosion process. The method used was weight loss according to ASTM G31-72 standards with exposure times of 96, 504, and 800 hours, supported by morphological analysis using SEM and optical microscopy, and chronoamperometry electroanalysis to determine ion diffusion rates. The results showed that the corrosion rate increased significantly at 504 hours (average 0.8467 mm/year) and decreased again at 800 hours (0.716 mm/year) due to the heterogeneity of the corrosion products. The surface morphology revealed the formation of cracks, corrosion pits, and non-compact corrosion layers. The highest diffusion rate occurred before exposure (7.35 × 10⁻ ⁻ cm²/s) and decreased after 96 hours. Overall, acid rain exposure caused a decrease in material quality and accelerated corrosion rates in SPHCPO steel. Keywords: Corrosion, SPHCPO Carbon Steel, Acid Rain, Weight Loss, Corrosion Rate, SEM, Chronoamperometry Permasalahan korosi pada baja karbon, khususnya jenis SPHCPO yang umum digunakan sebagai material rangka motor, menjadi perhatian serius karena terpapar lingkungan ekstrem seperti hujan asam dapat mempercepat degradasi material. Penelitian ini bertujuan untuk menganalisis laju korosi baja karbon SPHCPO dalam kondisi lingkungan hujan asam buatan, serta mengamati perubahan morfologi permukaan dan laju difusi ion selama proses korosi berlangsung. Metode yang digunakan adalah weight loss sesuai standar ASTM G31-72 dengan waktu paparan 96, 504, dan 800 jam, serta didukung oleh analisis morfologi menggunakan SEM dan mikroskop optikal, dan uji elektroanalisis chronoamperometry untuk menentukan laju difusi ion. Hasil penelitian menunjukkan bahwa laju korosi meningkat secara signifikan pada 504 jam (rata-rata 0,8467 mm/tahun) dan menurun kembali pada 800 jam (0,716 mm/tahun) akibat ketidakhomogenan produk korosi. Morfologi permukaan menunjukkan terbentuknya retakan, lubang korosi, dan lapisan korosi yang tidak kompak. Laju difusi tertinggi terjadi sebelum paparan (7,35 × 10⁻ ⁷ cm²/s) dan menurun setelah 96 jam. Secara keseluruhan, paparan hujan asam menyebabkan penurunan kualitas material dan percepatan laju korosi pada baja SPHCPO. Kata kunci: Korosi, Baja Karbon SPHCPO, Hujan Asam, Weight Loss, Laju Korosi, SEM, Chronoamperometry
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