The dissolution of iron in nitric acid solution in the presence of aniline, o-, m-, and p-aminobenzoic acids as corrosion inhibitors has been studied by thermometric and weight loss methods. For these aminobenzoic acids, the two methods gave considerably different results. The difference was ascribed to the reaction between iron, nitric acid and the aminobenzoic acids at the higher temperatures reached in the thermometric method, leading to the production of phenols. The results indicate that the thermometric method for determining dissolution rates in these conditions can be unreliable.
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References
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