Analisa Kekerasan Baja AISI 4340 Yang Dikorosikan Dengan Larutan NAOH Dan H2SO4 Menggunakan Metode Uji Kekerasan Rockwell
DOI:
https://doi.org/10.54706/senastindo.v7.2025.462Keywords:
AISI 4340 steel, H₂SO₄, CorrosionAbstract
AISI 4340 steel is a high-strength alloy steel widely used in the aviation and automotive industries due to its resistance to dynamic loads, but remains susceptible to corrosion due to exposure to strong acids and bases. This study analyzes the effect of NaOH and H₂SO₄ solutions on the mechanical strength of AISI 4340 steel using the Rockwell hardness test method. Specimens were immersed in both solutions for 7, 14, and 21 days, then hardness testing and corrosion rate calculations were carried out using the weight loss method. The results showed that the longer the immersion, the corrosion rate increased and the hardness value decreased, with the highest corrosion rate in H₂SO₄ at 0.00227 mpy and NaOH at 0.00162 mpy. The decrease in hardness is caused by electrochemical reactions that erode the steel surface, where the H₂SO₄ environment is proven to be more aggressive than NaOH. These findings can be used as a reference in efforts to mitigate corrosion and increase the reliability of AISI 4340 steel materials in aeronautics and machinery applications.
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Copyright (c) 2025 Vicentio Andri Yudatama, Hengky Emanuel
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