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A century ago, automotive companies developed the laboratory salt spray corrosion test method standardized in ASTM B117. Even then they knew this quality control test did not produce realistic exposures. Wet-dry cyclic tests provided modest improvements in correlation and have been used in architectural applications for many years.
A century ago, automotive companies developed the laboratory salt spray corrosion test method standardized in ASTM B117. Even then they knew this quality control test did not produce realistic exposures. Wet-dry cyclic tests provided modest improvements in correlation and have been used in architectural applications for many years. Innovations in the 1990s included a combined weathering and corrosion method validated by SSPC and automotive methods that improved comparative test results by varying the relative humidity and periods of wetness. Problems remained due to limitations in corrosion test chamber technology and the test methods designed around them. The automotive industry responded with new technical requirements for a new generation of test standards and chambers. As a result, today’s corrosion tests offer the promise of realistic results combined with high repeatability.
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.
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This paper deals with the issue of surface contaminates analyses presently available on the market. The amount of variations of analyses and more important statements of the results cause great problems on the market. Described in the paper are not only the analyses possible, but also the interpretations belonging to them. However, salt measurements are used worldwide, its basics often appear to be a worldwide mystery. This paper should clarify the most common made mistakes.
When protective coatings are to be applied to structures, it is important that the surface is clean and dry if premature failure of the coating is to be prevented and the full coating service life achieved. In many situations for both new build and repair of structures, blast cleaning of the surface is required to remove contamination and to create an anchor pattern to enhance the adhesion of the coating system to the substrate.