Dominant factors affecting erosion-corrosion resistance of aluminum–brass pipelines
AbstractThe degradation processes of aluminum–brass (CuZn20Al2As) alloy pipes were investigated in stagnant and flowing environments of various compositions. Experimental materials were randomly chosen aluminum–brass pipes defined by the same standard but with slightly different chemical compositions, microstructures, and surface conditions. These characteristics have significant influence on corrosion and erosion-corrosion degradation. To determine the most dominant parameters affecting the resistance to degradation under different operating conditions, several corrosion and erosion-corrosion tests were carried out. Corrosion resistance was evaluated by potentiodynamic and exposure tests. A pipeline system was designed and constructed to simulate operation conditions of the pipes in the cooling system of a power plant. The designed pipeline system allowed three different flow rates in the pipes simultaneously. Thus, it was possible to evaluate the influence of erosion-corrosion one flowing liquids inside the tested pipes by keeping the other experimental conditions identical. The erosion-corrosion behaviors of the tested materials were evaluated in an original experimental device. The obtained results allowed us to evaluate the combined effect of the corrosion environment and flow and to determine the material characteristics having the dominant influence on degradation processes.
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