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The aim of the present paper was to discuss, on the basis of electrochemical results and microscope observations, the representativeness of the Nissan OY water test (acidic solution containing chloride) used to evaluate the internal corrosion resistance of heat exchangers from the cooling loop. The corrosion behavior of brazed aluminum alloys (AA4343/AA3003*/ AA4343) was investigated in neutral and acidic solutions with and without chloride by electrochemical measurements. For the three layers present in the brazed material, i.e. the residual cladding, the band of dense precipitates (BDP) and the core material unspoiled by silicon diffusion, the polarization curves were obtained in the different media. It was observed that the core material presented good corrosion resistance in neutral solutions.

The recent evolution in automotive evaporator technology with multiport flat tubes replacing the plates has lead to new heat transfer pattern on the refrigerant side. Common used correlations can no longer be applied to model the heat transfer coefficient and new developed correlations are often limited to experimental conditions. This study presents a state of the art as well as a comparison of experimental results to these new correlations.