610 自動車用アルミニウム合金とゴムとの接着耐久性の短期試験方法(OS10-(1)オーガナイズドセッション《材料損傷の機構・実験評価》)

概要

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In automobiles, suspension bush, a component of aluminum alloy/rubber joints, realizes high level of silence and comfortableness. Gravity-die-cast AC4CH alloys have been applied to this component, and are being expected to be replaced with pressure-die-cast ADC 12 alloy to reduce the cost. However, decohesion arising from the corrosion of ADC 12 at the joint has been reported. This corrosion has been attributable primarily to the high contents of harmful elements for corrosion such as Cu and Fe, and secondarily to the fine microstructure caused by the pressure-die-casting process. Besides, a new corrosion test that shortens the time for the test is required. In this study development of such test has been attempted by increasing the tensile stress applied to the joint. Many test pieces of joints of pressure-die-cast ADC12 and extruded A6N01 (reference material) with NR/BR rubber were attached to three types of jigs that can apply different tensile stresses on the joint, and were subjected to CCT, compound cycle corrosion test, in accordance to JIS K 5621. The results obtained in the CCT by 10 cycles showed that the effect of the tensile stress applied to the joint was smaller than the fluctuation in the corrosion resistance of the test pieces. The increase in the number of cycles might cause the effect of the tensile stress to be appreciable.
2010-08-27