鎖状シリカ粒子を含む浴からのZn-SiO2分散めっき

概要

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Incorporation mechanism of the chained SiO_2 particles into zinc electrodeposits have been discussed. The SiO_2 particles have diameter of 30nm and about five particles are chained. These chained SiO_2 particles exist both on the (00・1)_η and (10・1)_η of hexagonal columnar zinc electrodeposits. The chained SiO_2 particles precipitate in two ways on the (00・1)_η of zinc electrodeposits : by lined up particles along the laterally growing macrosteps on the (00・1)_η and by randomly dispersed particles on the (00・1)_η. The sidewalls of the particles are incorporated into the macrosteps of the (00・1)_η. The chained SiO_2 particles randomly dispersed on the (10・1)_η. These randomly dispersed chained SiO_2 particles stick on the (10・1)_η after macrosteps reached to the edge of the hexagonal columnar electrodeposits.