Gold Plate Process
Gold Plate Black Anodize Process
Gold plating advantages include good corrosion resistance, good solderability, and, when alloyed with cobalt, it has very good wear resistance. Gold is a precious metal, which means that it will not oxidize in air, so its electrical conductivity stays uniform over long periods of time. These and other advantageous properties are among the reasons why gold plating volume continues to grow, even though the material’s price has risen dramatically over the years.
Gold is commonly used in electrical switch contacts, connector pins and barrels, and other applications where intermittent electrical contact occurs. It is also used as a radiation shield, in infrared reflectors and satellite electronic housings.
Gold’s hardness varies with the purity of the deposit, with the purest gold plating providing the softest deposit, and the lowest purity deposit being the hardest. Even though hard gold deposits are lower in purity than the soft gold, all gold plating at Coastline Metal Finishing is 24 karat gold.
Coastline Metal Finishing has three types of gold plating baths to serve our customer’s needs:
99.9% gold deposits with a knop hardness of 90 Knoop Hardness maximum, used for specific types of wire bondability and solderability where high purity is required to achieve proper adhesion strength of the bond and where the coating will be exposed to very high temperatures. Commonly called a Type 3 gold.
99.7% gold deposits with a knoop hardness range of 130–200 Knoop Hardness. This is a good overall deposit used for wear resistance, solderability, wire wrap and many others. The gold finish most plated at Coastline, this finish shares many of the attributes of the harder finish with solderability approaching that of the pure gold. Commonly called a Type 1 gold
99.0% gold deposits are primarily used for wear resistance. The hardness of this deposit is 201 Knoop Hardness minimum. Due to stresses developed when the coating is hardened, this deposit can be plated only in limited thicknesses. Please call with any questions regarding maximum thickness of this deposit before issuing a purchase order. This deposit is commonly called Type 2 Gold.
Coastline gold plates many different types of parts made of many different materials. In some cases the parts have several different finishes on them requiring close tolerance masking.