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Design, Fabrication, and Testing of Salt Spray as An Atmospheric Corrosion Test Tool Using MgCl₂ and NaCl Solutions

1Mechanical Engineering Department, Universitas Pertamina, Jl. Teuku Nyak Arief, RT.7/RW.8, Simprug, Kec. Kby. Lama, Kota Jakarta Selatan, Daerah Khusus Ibukota Jakarta 12220, Indonesia

2Faculty of Integrated Technology, Universiti Brunei Darussalam, Gadong BE1410, Brunei Darussalam

3Research Organization of Energy and Manufacturing, National Research and Innovation Agency, 15310 Serpong, Indonesia

Received: 3 Apr 2024; Revised: 27 Aug 2024; Accepted: 1 Oct 2024; Published: 30 Oct 2024.
Open Access Copyright 2024 Jurnal Kimia Sains dan Aplikasi under http://creativecommons.org/licenses/by-sa/4.0.

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Abstract
The research aimed to design a salt spray chamber adhering to ASTM-B117 standards and test the chamber with determine the atmospheric corrosion rate in a salt spray chamber using steel materials (ST 37 and SS 304) in NaCl and MgCl2 solutions. Corrosion tests spanned 48 hours, with time variables of 4, 6, and 8 hours of wet and dry cycle for 48 hours total. The objective was to design salt spray chamber and test the chamber to compare the corrosion rate based on solution and material selected. Visual inspections post-corrosion included macro photos, microscopy, SEM, and EDS analyses. Weight loss in Steel ST 37, cleaned per ASTM G1 with HCl, was also assessed. Corrosion rates of Steel ST 37 varied marginally across time variables and solutions. NaCl corrosion rates at 4, 6, and 8 hours averaged 4.5232, 5.8418, and 6.7148 mmpy, respectively. For MgCl2, rates were 4.2564, 5.3436, and 6.0915 mmpy, respectively. Stainless steel exhibited higher resistance compared to Steel ST 37. In conclusion, both NaCl and MgCl2 solutions accelerate corrosion, with NaCl inducing a higher rate. Stainless steel outperforms Steel ST 37, and the chamber material displays resilience against atmospheric corrosion.
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Keywords: Atmospheric Corrosion; MgCl₂; NaCl; Salt Spray Chamber; Steel ST 37; SS 304

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