Spread at least one coating on at least one surface of sandwich layer, contain the resin in the coating and the filler bead of 50% volume at least.
在芯层的至少一个表面上涂上至少一个涂层，涂层中含有树脂和至少50%体积的填料颗粒。
2
The anticorrosion behavior of untreated, silane treated and phosphating treated metal surface on metal is studied, and the epoxy resin is used as coating.