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The SBR-NR adhesion to the zinc plated steel cords were studied and the effects of different kinds of accelerators, sulfur dosage and cobalt-naphthenate content on the adhesion have been investigated. The experimental results before and after water aging and heat aging were shown by measurement of peel strength and rubber coverages. The optimum sulfur content in blend was about 3.5phr for the Zn-rubber adherends, while using MBTS and BBS. The wet corrosion of the adherends was promoted by extra addition of cobalt-naphthenate. However, by using TMTD, the peel strength and rubber coverages after aging test were higher than values before aging test. It can be caused due to the suitable interface layer formed during aging test. It was found that the good adhesion were obtained when using nickel naphthenate salt. Furthermore, with addition of nickel naphthenate, the Zn-rubber adherends showed more excellent wet corrosion resistence than that of cobalt naphthenate.

Studies on Adhesion of Zinc to Rubber, Part 1. Direct Adhesion between Zinc Plated Steel Cord and Rubber During Vulcanization.