Corrosion Protection by Organic Coatings

Abstract

The sections in this article are Introduction The Composition of Corrosion Protecting Organic Coatings Binder Pigments Anticorrosive Pigments Fillers and Additives Solvents Transport Phenomena in Organic Coatings Transport of Oxygen Transport of Water and Ions Adhesion of Organic Coatings Introduction to the Mechanisms of Protection and Degradation Mechanisms of Protection Blistering Corrosion Initiation Cathodic Delamination Anodic Undermining Application of Electrochemical Methods for the Characterization of the Protective Properties of Organic Coatings on Metals Monitoring of the Open Circuit Potential Electrochemical Impedance Spectroscopy Basic Analysis Equivalent Circuits Relevant Parameters Electrochemical Noise Scanning Reference Electrode Techniques The Application of the Scanning Kelvin Probe System Metal–Polymer–Humid Air System Metal–Oxide–Polymer–Humid Air System Metal–Metal Oxide–Electrolyte–Polymer–Humid Air Sample Preparation for SKP Measurements Corrosion Mechanisms of Polymer‐coated Metals Corrosion of Polymer‐coated Iron Introduction Cathodic Delamination on Polymer‐coated Iron Degradation of the Interface by the Oxygen Reduction Process Corrosion of Polymer‐coated Zinc and Galvanized Steel Cathodic Delamination on Polymer‐coated Zinc Cathodic Protection in the Case of Polymer‐coated Galvanized Steel FFC on Polymer‐coated Iron, Aluminum, and Magnesium Introduction to FFC Initiation of FFC Propagation of Filaments Transport of Oxygen Electrochemical and Auxiliary Measurements of FFC Influence of Surface Treatments and Compositions of Organic Coatings on the Corrosion Kinetics Conversion Coatings Adhesion Promoters and Interfacial Thin Films Influence of Pigments in Paints Intrinsically Conducting Polymers Overall Conclusions

Ageing mechanisms of polyurethane adhesive/steel interfaces

“…The fundamental mechanisms of corrosive delamination of organic coatings and adhesives so far have been mainly studied in their initial states neglecting the ageing process of the polymer phase itself [6,7]. Mainly, free standing adhesive films, not adhesive joints, were studied to predict critical mechanisms of corrosive delamination [8][9][10][11].…”

Surface Functionalization of Oxide-Covered Zinc and Iron with Phosphonated Phenylethynyl Phenothiazine

“…In the case of iron, naturally grown iron oxide, mainly ferric oxide, is porous and brittle and noninsulating, leading to continuous corrosion processes. 29 Ultrathin layers of organic molecules can act as an electronic, physical, and/or hydrophobic barrier, separating the metal substrate from a corrosive aqueous environment. Thus, such a layer may retard degradation reactions, which is a key feature in corrosion protection.…”

A forming limit curve for the corrosion resistance of coil-coatings based on electrochemical measurements

“…Usually, the impedance of painted metals [11][12][13][14][15][16][17] shows a single time constant at the beginning of immersion due to the response of the paint film, with the film capacitance (C f ) and the film resistance (R f ). A second time constant appears later, when corrosion starts at the paint-metal interface, with the response of the double layer capacitance (C dl ) and the charge transfer resistance (R ct ) at lower frequencies.…”

“…This technique provides quantitative parameters that can be related to different aspects of the system's performance (paint degradation and corrosion of the metal substrate) [11][12][13][14][15][16][17] and be used to determine limit values of acceptable performance. A brief discussion regarding the use of each parameter is now presented.…”