Na<sub>2</sub>SO<sub>4</sub>水溶液中の鉄に対するアミノ安息香酸類の腐食抑制作用

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タイトル別名
  • Inhibitive Effects of Aminobenzoic Acids on Corrosion of Iron in Aerated Sodium Sulphate Aqueous Solution
  • Na2SO4水溶液中の鉄に対するアミノ安息香酸類の腐食抑制作用
  • Na2SO4 スイヨウエキチュウ ノ テツ ニ タイスル アミノ アンソク コ

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説明

Inhibition effects of o-, m-, and p-aminobenzoic acids and benzoic acid on iron corrosion have been studied in aerated 0.5M sodium sulphate aqueous solution at 40°C by potentiodynamic polarization mesurements. o-Amnnobenzoic acid gave the best corrosion inhibition among the inhlbitors tested in the aqueous solutions with pH values between 5 and 8, The inhibition efficiency increased with increasing molar concentration of o-aminobenzoic acid in the aqueous solution, The corrosion potentials shifted largely toward noble direction with an increase in its concentration, because of inhibiting strongly the anodic iron dissolution reaction. A pale green precipitate film was observed to be produced on the surface while the iron specimen was dipped in the aqueous solution with o-aminobenzoic acid. The film thickness was found to depend on the corrosion rates and to become thinner with an decrease in corrosion rate. No visible film could be observed on the surface at 0.5 molar concentration of o-aminobenzoic acid given maximum inhibition, but the surface had been kept strong water repellent property. The precipitate film was found to be a chelate compound consisted of a ferric ion and two molecules of o-aminobenzoic acid by IR and UV spectroanalysis. It was concluded that iron corrosion was inhibited mainly by chemisorption film donated both amino and carboxyl radicals of o-aminobenzoic acid to iron surface, just as a surface chelate, and sec ondarily by chelate compound film produced on the surface.

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