Abstract
The effect of metal salt coating process on the bond strength of the bonded interface of 5052 aluminum alloy and 316L stainless steel was investigated by SEM observations of interfacial microstructures and fractured surfaces. Aluminum alloy surfaces were coated by boiling in 5% aqueous solution of NaOH for 5 s and 98% formic acid and 99.7% acetic acid for 20 s and 20 s respectively. Bonding process was performed at bonding temperature of 733 ~ 773 K under a pressure of 20 MPa (bonding time of 900 s). From this study, it is found out that the bonded strength of the joint increased with the rise in bonding temperature with or without metal salt coating process. However, it is understood that with metal salt coating process, high strength joint can be achieved with lesser deformation and lower bonding temperature. From the experimental results, it is found out that metal salt generation processing is effective at removing oxide film and substitution to a metal salt on the aluminum surface.
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