To explore the effects of adhesive on peel strength of heterogeneous clinched joints under acidic environment,taking the hot-rolled dual-phase steel DP590 and AA5052 as the raw materials,and 0.02 mol·L-1 NaHSO3 solution as the corrosion solution,the het-erogeneous clinched joints(clinched joints)and bonding-clinched joints(clinch-bonded hybrid joints)were subjected to wet-dry cyclic immersion alternate corrosion experiments.The static properties and failure mechanism of the joints under acidic environment were studied by static experiments,micro-failure fracture and energy spectrum analysis.The results show that the maximum failure load of the joints are significantly increased by using adhesive,and the bearing capacity of the clinch-bonded hybrid joints are 56.3％higher than that of the clinched joints.The use of the adhesive has no effect on the failure mode of the joints.When the corrosion time is 0 h,the failure modes of both clinched joints and clinch-bonded hybrid joints are internal lock pulling-out failure,but with the progress of corrosion,the failure mode gradually changes to neck fracture failure.The microscopic fracture morphologies of the upper plate of the clinch-bonded joints are characterized by dimples,and the slip marks at the tensile failure site of the lower plate gradually deepen.The surface element character-istics of the overlap area of the clinched joints under acid corrosion environment are more obvious than that of the clinch-bonded hybrid joints,indicating that the use of the adhesive has a certain protective effect on the clinched joints.
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