Effect of Some Analytical Organic Indicators on the Corrosion of Nickel in Carbonate Solution

Abstract

The effect of some analytical organic indicators, e.g. methyl red, methyl orange and methyl violet, on the corrosion of nickel electrode in 0.1 M K 2 CO 3 was studied using galvanostatic and potentiodynamic anodic polarization techniques. The percentage inhibition efficiency was found to increase with increasing concentration of these compounds. The inhibitive action of these compounds is due to their adsorption on the nickel surface, making a barrier to mass and charge transfer, following Freundlich isotherm. The inhibition efficiency decreases in the order: methyl red > methyl orange > methyl violet. It was found that the addition of the chloride, bromide, iodide and thiosulfate ions accelerates the pitting corrosion of nickel in 0.1 M K 2 CO 3 solutions by shifting the pitting potential to more negative direction. The addition of these analytical organic compounds protects the nickel against pitting corrosion in bromide containing solution.

GREEN INHIBITORS FOR CORROSION PROTECTION OF N80 CARBON STEEL IN 1M HCl AQUEOUS SOLUTIONS

“…Chemical inhibitors play an important role in the protedion and mitigation strategies for retarding corrosion ( 1), Most acid inhibitors are organic compounds containing nitrogen, oxygen and/or sulpher. These compounds are adsorbed on the metallic surface, blocking the active corrosion sites (2)(3)(4)(5). Due to the negative effects of these compounds caused in the environment (6), the development of novel corrosion inhibitors of natural sources and non-toxic type has been considered to be more important and desirable (7), Some investigations hove been made recently on the corrosion inhibition properties of naturally occurring plant extracts.…”

Breakdown of passivity of nickel electrode in sulfuric acid and its inhibition by pyridinone derivatives using the galvanostatic polarization technique

“…The use of organic compounds containing nitrogen, oxygen or sulfur in their chemical structure to inhibit the acidic and pitting corrosion of nickel has been studied [7][8][9][10][11][12][13][14][15][16][17][18].…”