© 2006 by Taylor & Francis Group, LLC

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8.2.2 Adhesion...........................................................................................136 8.2.2.1 The Difficulty of Measuring Adhesion ............................136 8.2.2.2 Direct Pull-off Methods....................................................137 8.2.2.3 Lateral Stress Methods .....................................................138 8.2.2.4 Important Aspects of Adhesion ........................................140 8.2.3 Barrier Properties .............................................................................140 8.2.4 Scanning Kelvin Probe ....................................................................142 8.2.5 Scanning Vibrating Electrode Technique.........................................143 8.2.6 Advanced Analytical Techniques.....................................................144 8.2.6.1 Scanning Electron Microscopy.........................................144 8.2.6.2 Atomic Force Microscopy................................................144 8.2.6.3 Infrared Spectroscopy.......................................................144 8.2.6.4 Electron Spectroscopy ......................................................146 8.2.6.5 Electrochemical Noise Measurement...............................147 8.3 Calculating Amount of Acceleration and Correlations ...............................147 8.3.1 Acceleration Rates ...........................................................................148 8.3.2 Correlation Coefficients or Linear Regressions ..............................148 8.3.3 Mean Acceleration Ratios and Coefficient of Variation.......................................................................................149 8.4 Salt Spray Test .............................................................................................149 8.4.1 The Reputation of the Salt Spray Test ............................................150 8.4.2 Specific Problems with the Salt Spray Test ....................................150 8.4.3 Importance of Wet/Dry Cycling ......................................................151 References..............................................................................................................152 © 2006 by Taylor & Francis Group, LLC
1 Introduction This book is not about corrosion; rather it is about paints that prevent corrosion. It was written for those who must protect structural steel from rusting by using anticorrosion paints. The philosophy of this book is this: if one knows enough about paint, one need not be an expert on rust. In keeping with that spirit, the book endeavors to cover the field of heavy-duty anticorrosion coatings without a single anode or cathode equation explaining the corrosion process. It is enough for us to know that steel will rust if allowed to; we will concentrate on preventing it. 1.1 SCOPE OF THE BOOK The scope of this book is heavy-duty protective coatings used to protect structural steel, infrastructure components made of steel, and heavy steel process equipment. The areas covered by this book have been chosen to reflect the daily concerns and choices faced by maintenance engineers who use heavy-duty coating, including: • Composition of anticorrosion coatings • Waterborne coatings • Blast-cleaning and other heavy surface pretreatments • Abrasive blasting and heavy-metal contamination • Weathering and aging of paint • Corrosion testing — background and theoretical considerations • Corrosion testing — practice 1.1.1 TARGET GROUP DESCRIPTION The target group for this book consists of those who specify, formulate, test, or do research in heavy-duty coatings for such applications as: • Boxes and girders used under bridges or metal gratings used in the decks of bridges • Poles for traffic lights and street lighting • Tanks for chemical storage, potable water, or waste treatment • Handrails for concrete steps in the fronts of buildings • Masts for telecommunications antennas • Power line pylons • Beams in the roof and walls of food-processing plants • Grating and framework around processing equipment in paper mills © 2006 by Taylor & Francis Group, LLC 1
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Page 3 and 4: Corrosion of Ceramic and Composite
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7 Corrosion Testing — Background
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© 2006 by Taylor & Francis Group, LLC

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