Abstract
Zinc coatings are commonly used to protect steel from different types of corrosion. However, zinc is an electrochemical reactive metal; applying surface treatment to galvanized materials is usually necessary to increase the system's lifetime. An alternative method for improving the service life of these coatings is the use of corrosion inhibitors. Nicotinic acid, chemically formulated as C5H4NCO, is a water-soluble vitamin. It is part of the B complex, which has been effectively tested in Zn and Zn-Al alloys in an acid medium, so it was proposed as a possible galvanized steel inhibitor as a pretreatment. Outstanding results determined a maximum efficiency in 20 ppm of nicotinic acid as a corrosion inhibitor for galvanized steel in NaCl 3%wt solution per 66.6% efficiency. In addition, nicotinic acid exhibits activity as a corrosion inhibitor to prevent the formation of pitting for galvanized steel in saline environments.
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