酸性塩化物浴から得られたZn-Ni-SiO₂複合めっき皮膜の耐食性

抄録

We examined the film composition stability of a Zn-Ni-SiO₂ composite plating film under widely various current densities. Results demonstrated that the Zn-Ni-SiO₂ composite plating film composition was stable over those conditions. Furthermore, results showed that the Zn-Ni-SiO₂ film from the acidic chloride bath showed improvement over uniform deposition of Zn-Ni alloy plating. Our research results revealed that an agglomerated layer of SiO₂ was formed near the Zn-Ni-SiO₂ composite plating film surface, providing high corrosion resistance. Moreover, the silica-based thin layer coating on Zn-Ni-SiO₂ composite plating film improved the corrosion resistance dramatically. Results demonstrated that adding SiO₂ nanoparticles to Zn-Ni alloy plating baths improves functionality in acid chloride baths.