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■Decorative gold plating
The gold plating has been utilized for harnesses, side arms, Buddha statues, Buddhist altar fittings and accessories as a method for utilizing the gold, which is less output at a maximum since ancient times. Even today, the gold plating is widely used as a technique necessary for accessories, fluorescent light fittings, frames of spectacles, watches, tags of bags, table wares and Buddhist altar fittings. For the electrodeposition, the gold plating of wide range of alloy ratio from 24K plating (degree of purity: 98% or more) to 14K gold alloy plating is practically used.
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The gold plating for industrial use plays an important role centering on electronic and semiconductor components.
In many cases of plating for industrial use, the gold plating is used as the alloy plating containing other metal slightly. The pure gold plating of 99.7% or more of purity degree is sometimes used and it is used for the applications that requires a certain degree of hardness and abrasion resistance in many cases even if IC header, stem or lead frame are also included, so it is used as a hard gold plating containing the nickel, iridium and cobalt by 0.1 to 8%. It is said that the hardness and the abrasion resistance of the hard gold plating for which nickel or cobalt is used as an agent for improving the hardness are improved to twice and threefold of those of pure gold plating, respectively. For the most of the electronic components such as contact and terminal, two types of plating of 2μm or less of film thickness are currently used and as a recent trend, the thinner specifications of 1μm to 0.5μm are increasing. For the soldering, an additionally thinner ultra-thin gold plating of 0.02 to 0.03μm is implemented.
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