Abstract
The low-carbon steel alloy (St60 steel) consists of steel (Fe) and elements such as carbon (C), silicon (Si), manganese (Mn), phosphor (P), and others. This research aimed to analyze the corrosion rate of steel St. 60 by nickel coating in a corrosion test using 4M concentrated H2SO4 (sulfuric acid) with soaking solution for 60 minutes, 120 minutes, 180 minutes, and 240 minutes respectively. This research obtained by weighing the samples to find the weight losses after corrosion which resulted of 31.8 mg, 104.0 mg, 318.1 mg, and 575.4 mg for samples in 60 minutes, 120 minutes, 180 minutes, and 240 minutes soaking duration respectively. The corrosion rate calculation showed relatively significant weight losses. The average weight loss from the specimens in soaking time of 60 minutes, 120 minutes, 180 minutes, and 240 minutes were 0.0203 mm/year, 0.0320 mm/year, 0.0642 mm/year, and 0.0893 mm/year. The highest corrosion rate process was found in the soaking duration of 240 minutes, with the value of 0.0893 mm/year. The significant weight loss meant that soaking duration greatly influences the corrosion rate with the conclusion of longer duration resulted in a high corrosion rate and vice versa.
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