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Inhibition effects of chromate, phosphate, sulfate, and borate on chloride pitting corrosion of Al
이호춘,Hugh S. Isaacs 한국전기화학회 2008 한국전기화학회지 Vol.11 No.3
Inhibitive effects of chromate, phosphate, sulfate, and borate on chloride pitting corrosion of Al have been investigated using cyclic voltammetry. During the anodic oxide growth, the critical concentration of chloride for pit initiation decreased in the order: chromate > phosphate > sulfate > borate, and the maximum pitting current density increases in the reverse order: chromate < phosphate < sulfate < borate. The decreasing pitting current density was observed in the successive polarization cycles, which was attributed to the aging of Al oxides and field relaxation at oxide/solution interface
Inhibition Effects of Chromate, Phosphate, Sulfate, and Borate on Chloride Pitting Corrosion of Al
Lee, Ho-Chun,Isaacs, Hugh S. The Korean Electrochemical Society 2008 한국전기화학회지 Vol.11 No.3
Inhibitive effects of chromate, phosphate, sulfate, and borate on chloride pitting corrosion of Al have been investigated using cyclic voltammetry. During the anodic oxide growth, the critical concentration of chloride for pit initiation decreased in the order: chromate > phosphate > sulfate > borate, and the maximum pitting current density increases in the reverse order: chromate < phosphate < sulfate < borate. The decreasing pitting current density was observed in the successive polarization cycles, which was attributed to the aging of Al oxides and field relaxation at oxide/solution interface.
Polyaniline, a Corrosion Inhibitor for Steel : a Mechanistic Study using Video Microimages
Cho, JeongHwan,Huh, JaeHoon,Oh, EungJu,Isaacs, Hugh S. 한국부식방식학회 2002 Corrosion Science and Technology Vol.31 No.4
We used a videomicroscopy during conventional electrochemical measurements to ascertain the mechanisms whereby coatings containing polyaniline inhibit the corrosion of steel surfaces. The polyaniline (PANI) coatings were prepared as either a dispersion consisting of PANl and cyclohexanon, or PANI dispersion blended with various ratios of epoxy. We observed that color of the PANl coatings changed during a corrosion test in IN NaCl solution, from the green emeraldine salt at the beginning to blue or pale yellow. The cyclic voltammogram of the dispersion coatings was basically similar to a pure PANI coating. The color change and the variation of open circuit potential (OCP) differed with the types of dispersion systems. The mechanism of inhibition of corrosion by PANl was investigated based on the result of the electrochemical measurements and close examination of the color changes in the video microimages during corrosion.