Process for plastic overmolding on a metal surface and plastic-metal hybride part

A process for manufacturing a plastic-metal hybrid part by plastic overmolding on a metal surface via nano-molding technology (NMT), wherein the process comprises the steps of:

• (i) providing a metal substrate having a surface area with surface irregularities of nano-size dimensions;
• (ii) providing a polymer composition;
• and
• (iii) forming a plastic structure on the metal substrate by molding said polymer composition directly on at least a part of the surface area with the surface irregularities of the metal substrate;
• wherein the polymer composition consists of:
• (A) 30-80 wt. % of a thermoplastic polyamide component;
• (B) 20-70 wt. % of silicon-boron glass fibers comprising predominantly silicon dioxide (SiO2) and boron trioxide (B2O3);
• and
• (C) 0.5-10 wt. % of other components, wherein the other components are selected from the group consisting of glass fibers, carbon fibers, glass beads, glass flakes, kaolin, clay, talc, mica, wollastonite, calcium carbonate, silica, potassium titanate, flame retardants, flame retardant, synergists, acid scavengers, plasticizers, stabilizers, processing aids, pigments and colorants, and antistatic agents,
• wherein
• components (A) and (B) are present in a combined amount of 90-99.5 wt. %, and wherein
• all weight percentages (wt. %) are relative to the total weight of the polymer composition.