Polymer plating of 6-substituted-1, 3, 5-triazine-2, 4-dithiols on magnesium alloys and applications of the plated alloys

Polymer plating of triazine dithiols on magnesium alloys and applications o f the plated alloys were investigated, focusing on important factors for im provement of corrosion resistance and adhesion properties of magnesium allo ys. Three kinds of triazine dithiols; 6-dihexylamino- 1,3,5 -triazine-2,4-d ithiol monosodium salts (DHN), 6-diallylamino-1,3,5-triazine-2,4-dithiols ( DAN), and 6-mercapto-1,3,5-triazine-2 4-dithiol (17N), were prepared for im parting functions such as corrosion resistance and direct adhesion to magne sium alloys. In polymer plating of DHN, film thickness initially increases with current density, reaches a maximum at 1 A/m(2), and then decreases. Fi lm thickness initially increases with DHN concentration, reaches a maximum at 8 mol/m(3), and then decreases. Polymer plating of DAN yields good polym er film on magnesium in terms of adhesion when 10 mol/m(3) NaOH/Na2CO3 aque ous solution is used as an electrolytic solution. An 8 mol/m(3) DHN aqueous solution was found to impart the best corrosion resistance for reaction re sistance and corrosion current density. In direct adhesion of EPDM to polym er-plated magnesium alloys, a film thickness of near 100 nm imparts the hig hest peel strength. In injection molding adhesion of PPS polymer to polymer -plated magnesium alloys, high tensile shear strength is obtained when mold temperature exceeds 140 degreesC.