Abstract
The relative durability of bonded joints made from steel substrates with five different surface conditions was assessed considering the effects of salt spray, humidity exposure and applied load. The surface conditions comprised degreasing, ligth oiling, two established pretreatments and an experimental pretreatment applied on top of oil. The results clearly show large differences in durability, with the oily joints demonstrating the worst performance. Simply removing the oil had little beneficial effect. The pretreated joints performed dramatically better, including those where the treatment was applied on top of oil. The effect of applied stress is discussed in light of the high retained strength of some of the stressed joints.
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