Influence of Corrosion Inhibitors on Fatigue Life of LY12 Aluminium Alloy Lap Joints

Corrosion test and fatigue test were carried out for LY12 aluminium alloy lap joints with and without corrosion inhibitors. Influence of corrosion environment on LY12 aluminium alloy typical bolt lap joints daubed with corrosion inhibitors was analysed by overhauling specimens. Influence of corrosion inhibitors on fatigue property of lap joints was collected and analysed. The results show that faying surface of specimens without corrosion inhibitors corroded more severely during the same time, corrosion inhibitors can inhibite corrosion, and the effectiveness of various corrosion inhibitors is different. In general environment, the fatigue life of specimens daubed with corrosion inhibitors reduced, influence extent is increasing obviously with the decrease of stess level. After 40 d corrosion, the fatigue life of specimens daubed with corrosion inhibitors increased, and influence extent is different with various stress level and corrosion inhibitors.