Ag-ZrB2分散めっきの表面特性

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Ag-ZrB2 dispersion plating was carried out from Ag cyanide plating baths containing suspended ZrB2 particles. Such plating has such advantageous properties as high melting point, excellent hardness, high electrical conductivity and good corrosion- and oxidation resistance. Some properties of the composite surface were investigated. The content of the ZrB2 particles in the composite layer, which was obtained under the conditions of 5A/dm2, 1200rpm, 1.0g/25mL and room temperature, was about 6wt% by gravimetric analysis. The hardness Hv of the Ag-ZrB2 composite layers was ranged from 105 to 120, about 1.3∼1.5 times those for pure Ag plating layers. In abrasion tests using a tester of our own devising, erosion of surface layers was less than 10% for Ag-ZrB2 composite and 20% for pure Ag deposit after the same number of rotations of the rub head. Electrical contact resistance between the Cu substrate and the composite layers was not different from that between the Cu substrate and deposited Ag, and it was shown that contacts was ohmic.Some test pieces of the Cu substrate plated with Ag-ZrB2 were set in the contact points of relay switches and a 100-VAC, 50Hz, 60-W resistive load (incandescent light bulb) was switched on and off. After 5×105 switching cycles no change was detected in contact resistance and the change in surface roughness was very slight in spite of the heat of arc discharge. These facts indicate that the composite layer of Ag-ZrB2 has many of the advantages of ZrB2, and that surface so plated may be suitable for use as contact material for electronic devices.

Ag-ZrB2分散めっきの表面特性

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