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The purpose of this paper is to show the effect of cinnamoylmalononitrile (CMN) compounds on the corrosion inhibition of carbon steel in HCl and the effect of some substituent groups on the corrosion inhibition.

Several papers have been published (1900‐1999), which aimed to investigate and explain the effect of organic compounds on the corrosion inhibition process. Two methods were used to determine the corrosion rate, weight loss and galvanostatic polarization. Additionally, the effects of temperature and concentration of the inhibitors were studied. The thermodynamic parameters for the process were computed and discussed.

The paper finds that surface analytical techniques such as X‐ray photoelectron spectroscopy and Auger spectroscopy can shed more light, on the mechanism of corrosion inhibition.

The use of donating and withdrawing groups will improve understanding of the mechanisms of corrosion and inhibition. However, the paper does not use the technique of impedance measurement for comparison purposes.

Other steel alloys and compounds with large or small molecular weights can be used for comparison.

The use of CMN compounds as corrosion inhibitors for carbon steel in HCl provides more information on carbon steel corrosion for academic and starting researchers.