シアン化銀浴からの銀めっきの硬度
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The hardness of deposited silver from cyanide baths was studied. The hardness of the deposited silver was Hv (80∼120) and became Hv (65∼85) after immersion in boiling water for 1h, Hv (50∼65) after baking at 200°C for 1h, Hv (38∼40) after baking at 600°C for 1h and Hv (72) after melting at 1000°C. The hardness of deposited silver from baths containning polyethilen glicol nonylphenol ether showed the same tendencies as deposited silver from cyanide baths with added Se was Hv (138∼148) and became Hv (70∼73) after immersion in boiling water, Hv (51∼55) after baking at 200°C for 1h and Hv (38∼40) after baking at 600°C for 1h. The effectiveness of hardening for silver deposited from a Se-added bath disappeared after immersion in boiling water and due to softening after 3 months.The hardness of deposited silver from cyanide baths added Sb was Hv (100∼170) and became Hv (95∼165) after dipping in boiling water for 1h, Hv (48∼120) after baking at 200°C for 1h, Hv (38∼40) after baking at 600°C for 1h, and Hv 72 after melting at 1000°C. The hardness of deposited silver from baths with added Sb depended on the current densities, (1∼6A/dm2, Hv100∼170).X-ray diffraction patterns and crystal sizes of deposited silver did not vary at 20∼200°C but did vary at 600°C. with on increased (111) plane and crystal size.The orientation of the deposited silver became the basic pattern for pure silver (ASTM-Ag), with a crystal size of 29.9nm after melting at 1000°C. It Was presumed that the hardness of deposited silver was decreased by diffusion of H absorbed in the silver and was changed due to crystal transformation or melting at 600∼1000°C. It is possible to adjust the hardness of deposited silver by heat-treatment and by adding hardeners to tho bath.Various types hardened silver deposits are utilized in functional materials.