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While single-metal plating has been used for many years for a variety of industries, “White Bronze” or tri-metal (Tri-M3) plating is quickly becoming a suitable alternative. White Bronze plating offers superior corrosion resistance, low electrical resistance, non-magnetic properties, and extremely high hardness characteristics. It’s a less expensive approach to using silver and offers definitive health safety advantages compared to nickel. Due to its cost effectiveness and performance White Bronze is rapidly becoming the preferred plating for RF Connectors.
White Bronze centers around an alloy ratio of 55% copper, 30% tin, and 15% zinc. It offers the same bright white finish as plated alloys that contain nickel, silver, or rhodium. It produces smooth, low friction surfaces with non-porous characteristics and is also non-magnetic. White Bronze is ideal for soldering applications as it is lead-free, can be soldered with or without flux, and offers excellent leveling characteristics. The most important factor for tri-metal alloys in electroplating is the ability to control the % alloy mixture to achieve specific performance characteristics and properties. This has resulted in an increase use of White Bronze for the electronics and telecommunications industries and is a significant replacement to traditional tin and copper-tin alloy plating via silver or nickel.
Precious metal plating is an expensive process, especially because the standard method for improving corrosion is to increase the plating thickness. With self-assembled molecules (SAM’s), however, metal plating can be reduced significantly without losing corrosion protection. In addition to enhanced corrosion protection, SAM’s will also allow plated components to have increased conductivity.
Conductivity and Reduced Metal Thickness
Precious metal plated items, and in fact any plated item, experience increased resistivity because of uneven surfaces. This resistivity becomes even worse when the plating is thicker. Most manufacturers are forced to increase the thickness of the plating to stop corrosion, but this can decrease the performance of the item while increasing the cost of production. SAM’s addresses both of these issues. The molecular shield provided through SAM’s helps slow the corrosion process down and allows manufactures to use a thinner plating deposit.
When this happens, the conductivity of the plated item improves as well. This is because the plating is thinner and the molecular shield provides a more even surface that lowers resistance. Contact resistance due to uneven surfaces caused by thicker plating creates localized heating. With SAM’s, however, this problem is solved because the molecular shield fills the voids in any uneven surfaces of the plated component. The surface then becomes smoother, enhancing conductivity.
One of the major benefits of
SAM’s is increased solderability, which is a result of
increased corrosion protection the post-plate process gives the plated component. When precious metal experiences corrosion, it affects anything soldered to the metal. When the metal coating is protected by
SAM’s, however, it resists corrosion for longer periods of time and improves solderability.
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A wide range of devices with numerous applications use precious metal plating. This process, however, can often be expensive and the precious metal is subjected to wear and tear that can eventually cause failures. Electro-Spec’s innovative methods for plating include a technological advancement known as SAM’s. The SAM’S process allows, for example a gold plated component to have a much thinner deposit without a reduction in functionality.
What is SAM’s?
SAM is an acronym for Self-Assembled Molecules. The SAM’S process employs bi-Functional or multi-functional molecules that offer two or more termination groups with different functionality. Essentially, the SAM’S proces s uses molecules that offer two levels of protection. The molecules used in the SAM'S method can be attached to metal alloys as well as ceramic, glass, plastics, and more. Right now, SAM’S technology is only being used as a post-plate surface treatment for gold, silver and tri-alloy (Tri-M3).
Thanks to its unique advantages over other plating processes, electroplating is used in a number of different applications today. Electroplating is a process in which a layer of metal is applied to the surface of another to create an attractive or protective coating. It was discovered in 1805 by Italian chemist and professor Luigi Brugnatelli who, like many great inventors, stumbled upon the process accidentally.
Ever the innovator, Electro-Spec’s engineering team identified a need for a plating process that would enhance the performance of RF connectors. What they developed was the TRI-M3™ finish; this cutting edge process represents a dramatic improvement in plating RF connectors.
The TRI-M3™ process provides high corrosion and tarnish resistance with a shelf life that far exceeds traditional silver plating, and with superior electrical performance to nickel. This plating method overcomes the negative characteristics of silver and nickel plating, while enhancing their positive properties. Silver exhibits excellent electrical properties, but tends to tarnish and break down over time, while nickel exceeds silver regarding longer shelf life and wear characteristics, but exhibits poor intermodulation performance, high permeability, and poor screening effects.
The first step in manufacturing stainless steel parts is the actual fabrication. All parts must be made to spec, and obviously must adhere to the guidelines of design and application.
The use of gold plating in the electronics industry has been an ongoing part of the expansion of more complex digital electronics and equipment throughout many industry sectors. According to BullionStreet, over 320 tons of gold are used each year in the electronics industry. This includes gold in PCs, mobile phones, tablets and other devices. The overall use of gold in electronics is via gold plating. Gold plating is primarily used on contacts for switches, relays, and connectors
As a pioneer in the plating industry, Electro-Spec constantly strives to improve upon current processes. . One of our recent technological innovations is the use of Self Assembled Molecules (SAMs) over plated surfaces. NanoSHIELD-AU provides a number of benefits for plated products, including reduced thickness, enhanced contact resistance, diffusion resistance, and corrosion and wear resistance. To date, Electro-Spec is the only metal finishing company in the world that utilizes this technology.
