Abstract
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•Electrochemical test data indicate SSLE belong to the mixed-type corrosion inhibitor.•Surface characteristics analysis provided that SSLE exhibit good anti-corrosion nature.•SSLE adsorb on the Fe/solution surface in accordance with the Langmuir model.
The anti-corrosion ability of Syzygium samarangense leaf extract (SSLE) was studied using electrochemical ways, topography research and theoretical calculations. The results of electrochemical tests indicated that SSLE can effectually control the Q235 steel corrosion in sulfuric acid environment. When the concentration of SSLE was 400 mg/L, its anti-corrosion ability can be close to 90%. SSLE can efficaciously restrict the cathodic and anodic reactions, and can still emerge high corrosion inhibition character at a certain temperatures scope. The surface morphology test shows that the Q235 steel becomes smooth and bright after adding SSLE. Theoretical calculation data indicated that SSLE can manifest high corrosion inhibition performance. The adsorption of SSLE at the solution/surfaces of steel accords with the Langmuir adsorption model.