The electrochemical behaviour of low carbon steel in 1 M H2SO4 and HCl
acid was studied in the presence of 4-hydroxy-3-methoxybenzaldehyde (HMD) as
the inhibiting organic compound through weight loss and potentiodynamic polarization
technique. Results show HMD has strong corrosion inhibition effects on the steel
in the acid solution. HMD performed excellently at all concentrations studied with
optimal inhibition efficiency of 96.6 and 92.5% from weight loss analysis and 88.81
and 91.35% for potentiodynamic polarization tests in H2SO4 and HCl. The compound
showed mixed inhibition properties in both solutions. Data from statistical analysis
through ANOVA shows the overwhelming influence of inhibitor concentration in
H2SO4 and exposure time in HCl on the inhibition efficiency of the organic compound.
Adsorption of the compound obeyed the Langmuir isotherm. Thermodynamic calculations
showed strong physiochemical interactions and spontaneous adsorption
mechanis
