Abstract
1-Phenyl-3-methylpyrazol-5-one (HPMP) was evaluated as corrosion inhibitor for mild steel in hydrochloric, nitric and perchloric acid solutions, using weight loss measurements at room temperature. HPMP was found to retard the corrosion rate of mild steel in hydrochloric and nitric acid solutions, while it aided the corrosion of same metal in perchloric acid solution. Corrosion rate decreased linearly with degree of surface coverage, and higher values of half-life were obtained for the coupons coated with HPMP inhibitor. The thicker the film of the HPMP coating on the metal, the more protection it gave to it, giving rise to the increase in inhibition efficiency.
Highlights
Metals are the pre-eminent important materials used in structural and decorative applications
HPMP inhibited the corrosion of mild steel in HCI and HNO3 environments, as lower values of weight loss were recorded for the coated coupons
The results show that the thicker the film of the coating, the more protection it gives to the metals, giving rise to inhibition efficiency
Summary
Metals are the pre-eminent important materials used in structural and decorative applications. Mild steel is regularly used in the construction of pipe lines. Many corrosion problems arise in these pipelines due to the aggressiveness of the liquids carried by them [1]. One of the methods used to reduce the rate of metallic corrosion is the use of inhibitors [2]. Many studies have been carried out to find suitable organic and inorganic compounds to be used as corrosion inhibitors for mild steel in different aqueous solutions, for example, 1H-1,2,4-triazol-l-yl-methyl2-(4-chlorophenoxy) acetate, methocarbamol, Potassium Iodide, Pyridoxal and Pyridoxal hydrochlorides, etc.
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