Implementation of a Protocol for Acceptance of New Over-Coating Systems for Steel Surfaces
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2021-03-01
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Edition:Final Report
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Abstract:This project was undertaken to develop a procedure to accept new coating systems for over-coating of steel surfaces and the results are presented in three parts. Section I and Section II covers acceptance procedure and details of information needed based on accelerated corrosion test. Section III presents a model for predicting field service life using the accelerated test results. Key steps of acceptance procedure are: (i) Submission of basic information for initial review, (ii) The required test results for evaluation, (iii) Initial approval and addition in the QPL as provisional candidate and (iv) Final approval after obtaining field data for a minimum of 2 years. Detailed guidelines are presented in the second section for conducting accelerated environmental exposure tests and reporting the information needed for approval. The new test method is based on direct pull-off (adhesion) strength at various stages of corrosion and provides clearly measurable degradation within three months of accelerated exposure. The results show a clear difference between the best and the poor coatings and also correlate well with results of long-term field study. A model for predicting the service life of coatings using the accelerated test results, presented in Section III is based on the science of corrosion, models available in existing literature and information available on field performance. The model can be used to estimate the service life new formulations using accelerated test results that can be completed within one year.
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