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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 is the hardest of the PGMs. Its hardness is about 800. Compare that to cobalt hardened gold at 200 knoop, 14k ElectricGold at 400 knoop and at 400 knoop. Rhodium is the hardest, most wear resistant metal that we plate at Professional Plating. In addition to its hardness, rhodium is extremely resistant to corrosion. Rhodium is an excellent choice where contact with corrosive gases or other high corrosion environments will be encountered. Remember also that as the operating environment temperature increases, the corrosion rate will also increase. So in high temperature applications, rhodium will provide a longer life cycle, than, for example, gold will. Rhodium will reliably operate beyond 1000F.
Rhodium is an extremely bright white metal. It is much whiter than palladium and platinum. For this reason and because of its extreme hardness, rhodium is very commonly used as an electroplated surface for fine jewelry.
Rhodium plated product is well suited for such applications as sliding electrical contacts that require protection from sliding contact wear or galling. Also, because of its high temperature tolerance to oxidation, rhodium is an extremely good choice for high voltage/high amperage electrical contacts where contact arcing would otherwise cause the formation of highly electrically resistive oxide formations on the contact surface.
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.
Suresh metal Finishers Company provides industry-leading precision lead plating services to MIL-L-13808. Our expertise in providing technical barrel, rack and vibratory lead plating process is currently employed in numerous industries including the defense, railway, aerospace, bearing, fire-protection and battery sectors.Suresh metal Finishers lead plating services are employed for highly corrosive applications due to the outstanding performance of lead in corrosive environments especially when dealing with strong mineral acids such as sulfuric acid. Lead also has outstanding solderability making it ideal for use in critical electrical and electronic applications.
Suresh metal Finishers also specializes in demanding plate-to-gauge lead plating services for bearing applications in the defense, aerospace and railway industries. Our dedicated Quality Control department provides prelate, in-process and post-plate dimensional and RMS inspections of inner and outer bearing surfaces to ensure dimensional and surface finish requirements are met. Heavy build lead plating services have been provided up to 0.020 inches in thickness per side.
Lead Plating Services Lead Properties
Lead Plating Services Lead Specifications
The most common lead plating service certified by Suresh metal Finishers is MIL-L-13808. Suresh metal Finishers also can certify lead plating services to most company-specific lead plating specifications. A summary of lead plating services
Per MIL-L-13808 is provided below:
Lead Plating Services to MIL-L-13808Type I: Without a preliminary copper coatingType II: With a 0.33um (0.000015 inch) minimum preliminary copper underplateClass 1 25 um (0.001 inch) minimum lead plating thicknessClass 2 13um (0.0005 inch) minimum lead plating thicknessClass 3 6 um (0.00025 inch) minimum lead plating thickness
Additional information noted regarding lead plating types:
6.1.1 Type I No Copper Underplate:Lead may be plated directly on copper, brass or copper rich alloy surfaces. For steel surfaces, the type II process with a preliminary copper coating should be used to obtain adequate adhesion and corrosion resistance.
6.1.2. Type II Copper Underplate:Recommended for all applications except where the presence of the initial thin copper coating is detrimental to the use. The thin undercoat of copper increases the salt spray resistance of lead coatings varying in thickness from 6 to 25 um (0.00025 to 0.001 inch) by as much as a factor of two as well as improving adhesion of the lead to the steel.
Lead Plating Services Why Suresh metal Finishers?
Suresh metal Finishers provides expertise in lead plating services to fulfill even the most demanding functional requirement. From prototyping and PPAP qualification to full production processing it is dedicated effort to exceed your expectations. The following points highlight why Suresh metal Finishers is a leader in lead plating
services:Diversity of Substrates: Suresh metal Finishers provides lead plating services on nearly any metallic substrate including hardened and alloyed steels, stainless steels, cooper and copper alloys including beryllium, chromium and tellurium copper, brass alloys, Inconels, Hastalloys, Monels, ductile & cast iron.
Demanding Plate-to-Gauge Requirements:Suresh metal Finishers specializes in demanding plate-to-gauge lead plating services required for bearing applications. Our QC department is proficient in OD and ID bore micrometers and profilometer inspection to ensure bearings meet print dimensional and RMS requirements.REACH Compliance: Suresh metal Finishers is at the forefront of environmental compliance and can certify our lead plating services as needed to the current REACH regulations.
Competitive Pricing:Suresh metal Finishers has been providing quality lead plating services for over twenty years. Competitive pricing in lead plating services is paramount to gaining and maintaining our customers in todays competitive global marketplace.
Lean Lead Times:With inventory a word of the past, rapid turn around is a key principle that we focus upon to provide the service our customers need.
Value Added:Suresh metal Finishers prides itself on meeting the customers needs. Whether its custom engineering packaging, vacuum or nitrogen sealed packaging to enhance storage, Kanban inventory management, light subassembly or multiple finishing combinations Suresh metal Finishers will work with you to ensure we meeting your needs in lead plating services.Extensive in House Analytical and Quality Lab Services: SPC is employed in all wet-lab work surrounding our lead plating services to ensure baths are analyzed and adjusted at optimum frequencies to ensure operation between critical upper and lower control points. Our quality lab employs the latest in x-ray, coulometric and spectrophotometer technologies to inspect your parts and will work to your requirements to provide testing as needed. Our quality lab can certify salt spray performance to ASTM B117, adhesion to ASTM B571 and solderability to ASTM B678. Mounted cross sections of parts are also available.
This specification covers the requirements for electrodeposited cadmium coatings on products of iron, steel, and other metals. Cadmium coatings are used for corrosion resistance and corrosion prevention The as deposited coating (Type I) is useful for the lowest cost protection in a mild or noncorrosive environment where early formation of white corrosion products is not detrimental or harmful to the function of a component. The prime purpose of the supplementary chromate finishes (Types II and III) on the electroplated cadmium is to increase corrosion resistance.Electrodeposited cadmium coatings shall be classified on the basis of thickness as Class 25, 12, 8, and 5. The coating shall be essentially pure cadmium produced by electrodeposition usually from an alkaline cyanide solution. The basis metal shall be subjected to such cleaning procedures as necessary to ensure a surface satisfactory for subsequent electroplating. Cadmium shall be deposited directly on the basis metal part without an undercoat of another metal except when the part is either stainless steel or aluminum and its alloys. The plating shall be applied after all basis metal heat treatments and mechanical operations. The thickness of the coating everywhere on the significant surface shall conform to the requirements of the specified class. The cadmium coating shall be sufficiently adherent to the basis metal to pass the tests. The supplementary Type II chromate film shall be adherent, nonpowdery, and abrasion resistant. The thickness of electrodeposited cadmium coatings shall be determined by the applicable test methods.
