Electroless Nickel Plating/

Rhodium Plating

Rhodium plating refers to the process of depositing a thin layer of the chemical element rhodium (Rh) onto a conductive metal surface. As a chemical element, rhodium is a particularly rare substance, and features a silver-white color. A very hard and chemically inert element, rhodium is a transition metal and is categorized as being part of the platinum group metals (PGMs), meaning that rhodium has the shared characteristics of excellent catalytic properties and wear-resistance.

Mil-Spec Metal Finishing Inc.
Edgewater, FL
866-364-2535
Mil-Spec Metal Finishing provides high quality electroless nickel plating to a variety of industries. We focus on quality, quick turnaround service and total customer satisfaction. Our motto is "We handle your parts with care". Our staff is highly trained and dedicated to our strict quality standards. We want to help you complete your next electroless nickel project. Visit our website today!
Imagineering`s primary mission is to provide customers a competitive advantage and be recognized as the metal finishing expert of choice. We have electroless nickel plating, phosphates, chromate conversion, dry-film lubricants and specialty paints. We develop a synergistic and symbiotic relationship with every customer and employee. We are QS-9000, ISO 9002 and AS 9000 certified.
Klein Plating Works, Inc.
Erie, PA
814-452-3793
Since 1915, Klein Plating has provided metal finishing and electroless nickel plating to the electrical and electronics industries. We provide various metal plating services such as gold, silver, copper, tin, nickel, solder and electroless nickel. We know that the value of customer relationships are directly beneficial to the success of our company. Call us or visit our website today.
Whitman Company, Inc.
Whitman, MA
800-783-2433
Excellent metal finishing begins with Whitman Company. We provide decorative & functional plating on industrial, electronic, medical & consumer products. Our finishing touches include metal plating and finishing, chrome and electroless nickel plating, gold, rhodium, silver, brass, black nickel, copper, anodizing and more. Whether your job is large or small, there`s a big advantage with us.
Saporito Finishing Co.
Cicero, IL
708-222-5300
Saporito is a leader in environmentally responsible finishing striving to maintain high standards in areas of environmental regulation. Since 1946 we have provided high-quality metal finishing services. We are your single source of aluminum and magnesium anodizing, metal plating, tumbling and deburring and electroless nickel plating. We are an ISO 9001:2000 certified company.
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Industry Information

Rhodium Plating

Due to its many advantageous properties, rhodium is often utilized in plating processes in order to endow other metals with its beneficial characteristics, most commonly for protective purposes. As a result, rhodium plating is a typical process in many industries including: commercial, where it is widely used for jewelry for plating on materials such as white gold and platinum; medical, in which plating is used to give optical instruments extremely hard surfaces; electronics, used to protect sensitive electrical instruments such as electrical contacts and capacitors; industrial manufacturing, in order to strengthen weak materials for processing (although it is a very expensive option); and telecommunications, for the surface protection of devices such as mobile phones. However, although there are multiple practical applications, rhodium plating is most commonly utilized for decorative purposes.

Not able to maintain plating for a long-duration, rhodium is most commonly plated using an electroplating process. In the jewelry industry, this process is known as rhodium flashing. In rhodium electroplating, the surface of a metal object is coated with a layer of a rhodium through electrochemical means, which means that both a chemical solution and an electric current are utilized in order to enable deposition. However, although it is not as common, rhodium plating may also be performed utilizing an electroless plating process. In electroless rhodium plating, an electrical current is not utilized whatsoever; instead, the process depending entirely upon a chemical reaction. In this chemical reaction, the rhodium is immersed in an aqueous solution that is often referred to as a bath solution. Without an electrical current, the rhodium reacts as a result of the introduction of a reducing agent into the bath solution. The reducing agent, which is typically something like sodium hypophosphite, functions to release hydrogen and causing the rhodium's ions to react and to be produce a negative surface charge that results in deposition. The addition of rhodium to any other metallic surface provides a very hard and reflective, white-colored surface.