The GM9511P standard, developed by the General Motors company, defines a test method to be followed when evaluating the corrosion creepback resistance on painted metal surfaces such as steel, zinc-plated steel and aluminum. Corrosion creepback is the loss of paint adhesion and corrosion of the base metal causing the paint film to deteriorate or blister.
Organic coatings protect against corrosion by forming a physical barrier between the metallic substrate and the environment. In practice, a conversion coating process consisting of a chromate or phosphate compound is included in the coating system to ensure adequate protection of the metallic substrate and improve coating adhesion. The high efficiency / cost ratio of chromium (VI) compounds, especially chromates, has led to the widespread use of these substances as corrosion inhibitors to prevent corrosion of different metals and alloys.
However, it has been reported that chromate and similar hexavalent chromium compounds are toxic and carcinogenic and pose a health risk in working environments where they are normally processed.
Paint is the most commonly used material to protect steel. Paint systems for steel structures have been developed over the years to comply with industrial environmental legislation and respond to demands for enhanced durability performance. Modern specifications often include a sequential coating application of paints or alternatively paints applied over metal coatings to form a duplex coating system. Protective paint systems usually consist of primers and topcoats. Each coating layer in any protective system has a specific function.
Vehicle painting is one of the most costly processes in the automotive industry. The painting process typically covers 30-50 percent of the costs of an automotive assembly plant. This high cost is attributed to the need to have high quality coatings and the requirement to comply with strict environmental regulations. The coated surface must be finished to provide an excellent surface quality. Mainly used in the automotive industry, the function of the paint is to protect the underlying metal from the harsh environments it is exposed to.
Among the numerous test, measurement, analysis and evaluation studies it provides for businesses in various sectors, our organization also provides creepback testing services on paint systems on metal surfaces, within the scope of the GM9511P standard, with its trained and expert staff and advanced technological equipment.
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