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Quality Assurance/Quality Control (QA/QC), often referred to as inspection, is critical to the success of a protective coating or lining project. Several parties can and do get involved in inspection including the owner, specifier, third party inspector, general contractor, painting contractor, equipment supplier, and coating manufacturer.
Quality Assurance/Quality Control (QA/QC), often referred to as inspection, is critical to the success of a protective coating or lining project. Several parties can and do get involved in inspection including the owner, specifier, third party inspector, general contractor, painting contractor, equipment supplier, and coating manufacturer. Understanding how the QA and QC concepts work together, how the parties work together, and the resulting documentation will help assure a quality application, satisfied customer, and a profitable project.
Pull-off adhesion testing is widely used to assess the protective coating process. It is also used to determine if a coating is fit for service in new construction and for repairs to existing structures. The result is often critical to the acceptance or rejection of a coating process, as the adhesion value quoted by the paint manufacturer can be adversely affected by aspects of the coating process. Low adhesion values are indicative of premature failure of the coating and are often due to inadequate surface preparation of the substrate.
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The role of a Coating Inspector has evolved considerably over the past few decades, and the responsibilities have increased over what used to be a rather straightforward job: to verify that surface preparation and coating application meet the project specification requirements. Today there are week-long or multi-week basic and advanced coating inspection courses, specialty courses that are industry-specific (e.g., bridge, nuclear), courses that are substrate-specific (e.g., concrete coatings inspection) and even coating-specific (e.g., inspection of thermal spray coatings).
Steel surfaces are frequently cleaned by abrasive impact prior to the application of protective coatings. The resultant surface profile must be accurately assessed to ensure compliance with job or contract specifications. But is profile height alone (the most commonly measured parameter) a good indicator of long-term coating performance?