SLE (Melastoma candidum D. Don) was tested as an inhibitor of St-37 S corrosion in a HCl solution, using WL, PDP and SEM analysis methods. CR has decreased with SLE addition, according to the WL method. The highest IE(%) was 67%, with 0.8% SLE addition. Rise in T had a decreasing effect on IE(%). PDP showed that the extract was a mixed inhibitor. SEM analysis showed changes in the St-37 S surface immersed in HCl, without and with the inhibitor. SLE adsorption onto the steel surface obeyed Langmuir's isotherm.
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