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Study of the Compatibility of the CAB Flux and Commercial Cooling Fluids
Published May 20, 2007 by Institution of Mechanical Engineers in United Kingdom
Cost reduction and component design improvement to increase the performance and durability of the exchangers has led the automotive industry to switch from electro-welded to folded tube technology. Due to the brazing of the tube, the amount of flux in contact with the coolant has increased. Process improvements have been carried out in order to decrease drastically the amount of flux used.
In this study, the interaction between the residual flux and the coolant was studied in order to assess the impact on the performance of the coolant, especially for corrosion protection.
Several experiments were set up in order to characterize the properties of three types of coolant with organic and mineral inhibitors containing flux used in controlled atmosphere brazing. The impact of coolant ageing was also studied by measuring the properties difference between new and worn coolant.