For your Rhodium (Rodium) plating requirements, Manideep Techno Coats. has facilities for plating both small and large parts in various sized barrels, racks and wiring.
Rhodium is white in color and is a precious metal, meaning non-oxidizing. Rhodium is a member of the Platinum Group of Metals. The Platinum Group of Metals is a group of six metals which include platinum, rhodium, palladium ruthenium, osmium, and iridium. These six metals all share some common physical properties. They have high melting points, are very dense, are very hard, and are very resistant to corrosion.
Rhodium plating specification
The relevant specifications for calling out rhodium plating are =MIL-R-46085 Rhodium Plating, Electrodeposited, and ASTM B 634 – 88 (Reapproved 1999) Standard Specification for Electrodespoitied Coatings of Rhodium for Engineering Use
We have two suggestions for specifying the plating of rhodium:
1. Thickeness of the deposit should be minimized. Electroplated rhodium deposits tend to develop a highly fractured, very dense crystal structure. This high fracture crystal structure contributes directly to the wear hardness and durability of the rhodium surface. However, as the thickness of the deposit increases the possibility of the electrodeposit fracturing and delaminating from the substrate increases. Standard good manufacturing practice for rhodium plating requires that the rhodium bath be kept absolutely free of impurities and continuously monitored for the correct amount of organic stress reduction compounds. When properly maintained, a rhodium electrodeposit of up to 100 micro inches (2.5 micros, 0.000100 inches) is regularly attained.
A typical rhodium thickness would be 20 -30 micro inches. Please call us regarding your specific requirement.
2. It is our standard practice to undercoat all rhodium plating with a thin layer of gold. We strongly suggest that a thin gold upder-layer be included in the plating specification. Typically, plating specifications require only a nickel underplate for performance. However, the gold under-layer, in conjunction with proper bath maintenance will provide the most stress free, dependable electrodeposit.