Abstract
Several multi-materials, which are joints of high-strength steels and lightweight materials such as aluminum alloy and carbon fiber reinforced thermoplastic, were subjected to the cyclic corrosion test for simulating atmospheric corrosion of automotive bodies and outdoor exposure tests. The ion-selectivity of the corrosion products formed in the multi-material gaps was examined by a membrane potential measurement. The corrosion products of all examined joints showed anion-selectivity rather than cation-selectivity. Corrosion products formed in joint gaps were less effective in preventing the progression of galvanic corrosion, suggesting that sufficient atmospheric corrosion protection is required for the use of multi-materials.
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