有機めっき処理金属とゴムとの直接加硫接着に関する研究 （第２報） 有機めっき処理マグネシウム合金ＡＺ９１Ｄとアクリルゴムとの直接加硫接着

Abstract

The non-adhesive and corrosive magnesium alloy AZ91D can be adhered directly to acrylic rubber (ACM) during vulcanization through the polymer plating of AZ91D in 2-diallylamino-1, 3, 5-triazine-4, 6-dithiol monosodium (DAN) aqueous solutions. The triazine thiol film can be plated stably onto AZ91D only in the strong base solutions, though the anodic oxides such as Mg(OH)2 and MgO are formed simultaneously in the polymer plating process. The peel strength of the adherend of the polymer plated AZ91D to ACM is dependent strongly upon the absolute and relative content of the triazine thiol composition in the plating layer. Increasing the concentration of NaOH in the electrolytic solution, the composition ratio of triazine thiol to anodic oxides in the plating layer decreases and thereby the peel strength of the adherend decreases accordingly. Adding Na2CO3 into the electrolytic solution containing low concentration of NaOH, the composition ratio of triazine thiol to anodic oxides, and consequently the peel strength of the adherend can be increased. Moreover, in order to obtain adherend with high peel strength, AZ91D should be polymer plated in the optimum range of current density and time, and at low temperature under 20°C. The adherend has good heat aging resistance and excellent oil resistance.