Determination of Polarization resistance and corrosion rate by using pulse method, polarization curves and AAS

✍ Scribed by Doc. Dr.-Ing. M. Metikoš-Huković; Dr.-Ing. C. Zevnik

• Publisher: John Wiley and Sons
• Year: 1982
• Tongue: German
• Weight: 684 KB
• Volume: 33
• Category: Article
• ISSN: 0947-5117
• DOI: 10.1002/maco.19820331204

✦ Synopsis

Abstract

In this article, a presentation is made of the application of accelerated electrochemical methods in measuring the corrosion rates of electrolytic zinc coatings obtained from acid sulfate baths, with and without organic additives. The influence of deposition parameters on the corrosion resistance of zinc coatings in a deaerated 5% NaCl (pH = 6.4) solution at t = 25 and 35°C has been studied. The Tafel constants and polarization resistance have been calculated from the j‐E curve in the vicinity of E~corr~ by means of computer and on the basis of the Mansfeld graphic method. The statistical relation between the corrosion current and the polarization resistance has been determined by the method of least squares.

The dependence of the corrosion rate from the time of exposure to the corrosion medium has been studied by the pulse galvanostatic method and by direct analysis of the corrosion solution with absorption spectrometry. A good correlation of the results facilitates the practical application of this accelerated electrochemical method in the study of zinc and Zn‐coatings resistant in electrolyte solutions and under conditions of atmospheric corrosion.