hrvatski

Ispitivanje korozije traka CuAlNi legure dobivene brzim hlađenjem u NaCl otopini

The corrosion behavior of the CuAlNi alloy ribbons obtained by rapid solidification was investigated in 0.9 % NaCl solution (pH 7.4) at temperatures of 24, 37 and 50 o C. The influence of chloride ions concentration on corrosion of CuAlNi ribbons has also been investigated in 0.1% and 1.5% NaCl solution. Measurements have been performed by electrochemical methods such as monitoring the open circuit potential, linear and potentiodynamic polarization methods. Results of the investigations have shown that increase in chloride concentration and electrolyte temperature leads to increase the corrosion current density and decrease the polarization resistance values which mean higher corrosion attack on CuAlNi alloy. Microscopic images have shown significant pitting corrosion damages on the CuAlNi alloy surface. Increasing the electrolyte temperature increases the surface damages of the electrode due to more intense corrosion. SEM surface images of CuAlNi electrodes have confirmed that with elevation of chloride concentration a more intense corrosion attack occurs. EDS surface analysis indicated dominant percentage of copper, chlorine and oxygen on the surface, indicating the formation of copper oxide and chloride as the major corrosion products on the surface. The presence of a small percentage of aluminum indicates its distribution in the form of aluminum oxide and chloride in the surface layer.

legure s prisjetljivosti oblika, CuAlNi legura, korozija, elektrokemijske metode, SEM/EDS analiza

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