Silver Plating Services (Electroplating) per QQ-S-365, ASTM B700, AMS 2410, AMS 2411 & AMS 2412
Advanced Plating Technologies offers functional silver plating services to QQ-S-365 ASTM B700 and AMS 2410, AMS 2411 & AMS 2412. Our expertise in providing precision barrel, rack and vibratory silver plating services is currently employed in numerous industries including the medical, telecommunications, aerospace and electronics industries. Heavy build silver plating services up to 0.025” per side have been successfully provided by APT within the petrochemical and bearing industries.
APT offers a wide range of silver plating services including matte, semi-bright and bright silver deposits. Purities up to 99.9% pure are available with Type I, matte, 99.9% pure silver plating services available for wire bonding or defense applications. APT has the ability to underplate with various nickel plating services including both bright electrolytic nickel, sulfamate electrolytic nickel and electroless nickel deposits as well as copper plating if required.
Inhibiting of silver plating services with RoHS compliant post plate chromates and triazoles are available. In addition, nitrogen backfilled and sealed packaging is available to eliminate the potential for tarnishing of uninhibited deposits. Nitrogen bagging can extend the shelf life of silver plated products indefinitely ensuring low contact resistance and solderability at time of assembly when the packaging is opened.
Silver is an extremely ductile metal with a brilliant white luster. It has the highest electrical and thermal conductivity of all metals as well as the highest optical reflectivity in the visible range (gold plating is superior in the infrared range). Silver offers excellent high-temperature lubricity making it an excellent coating for antigalling and antiseizing applications on high temperature nuts and bearing surfaces with service temperatures up to 1200F. 99.9% pure, matte silver offers excellent solderability and wire bonding ideal for lead frames and circuit applications.
Silver has been known since ancient times for making jewelry and high-end utensils and is generally considered a precious metal. In reality silver is more properly designated a semi-precious metal due to the fact that it readily tarnishes, forming silver sulfide on the surface when exposed to air or water containing an oxidant and source of sulfur.
The most common silver plating services certified by Advanced Plating Technologies are QQ-S-365, ASTM B700 and AMS 2410, AMS 2411 and AMS 2412. APT can also certify our silver plating services to most company-specific silver plating specifications as shown in our specification database. A summary of silver plating services per the MIL, ASTM and AMS specs is as follows:
Silver Plating Services to QQ-S-365
Grade A: With Supplementary Tarnish Application (Chromates)
Grade B: Without Supplementary Tarnish Application
3.3.5 Suitable Undercoat: The final silver deposit shall be preceded by an electrodeposited coating of silver from silver strike solutions. The plating shall be applied over an intermediate coating of nickel or nickel over copper on steel, zinc and zinc-base alloys. Copper and copper base alloys require intermediate coatings. Copper-alloy-basis metal articles on which a nickel undercoat is not used and other basis metal whereon a copper undercoat is employed shall not be used for continuous service at a temperature in excess of 149C (300F). Adhesion of the silver plating is adversely affected because of the formation by diffusion of a weak eutectic of silver and copper at the silver-copper interface.
3.4.1 Thickness of plating: Unless otherwise specified the minimum plating thickness shall be 0.0005 inch (0.013mm) on all surfaces on which silver is functionally necessary (for example: appearance, wear, corrosion protection, conductivity). The plating on nonfunctional surfaces and areas shall be of sufficient thickness to ensure plating continuity and uniform utility, appearance, and protection. On ferrous surfaces the total plated thickness shall be not less than 0.0010 inch (0.025mm). This must be comprised of at least 0.0005 inch (0.013mm) or more of silver plate over 0.0005 inch (0.013mm) or less of nickel or copper of any combination thickness of nickel and copper from 0 percent to 100 percent. The copper shall be deposited first over the steel surface.
Silver Plating Services to ASTM B700
Type 1: 99.9% Min Purity
Type 2: 99.0% Min Purity
Type 3: 98.0% Min Purity
Grade A: Matte Deposits – Deposits without the use of brighteners
Grade B: Bright Deposits – Deposits obtained with the use of brighteners
Grade C: Bright Deposits – Deposits obtained by mechanical or chemical polishing of Grade A coatings
Grade D: Semibright Deposits – Deposits obtained by the use of addition agents (grain refiners)
Class N – Without Supplementary Tarnish Application (Chromates)
Class S – With Supplementary Tarnish Application
6.3.4 Underplating: A nickel or nickel-alloy intermediate layer, at least 1um thick, shall be applied before the silver electroplate when the product being plated is made from copper or copper alloy. Nickel underplating is also applied for other reasons.
3.2.1 Parts shall be plated in the following sequence except as permitted in 18.104.22.168, 22.214.171.124 or 126.96.36.199: Nickel Strike, Silver Strike, Silver Plate
188.8.131.52 The nickel strike may be omitted when plating copper and copper alloys
184.108.40.206 A gold or palladium strike may be used in place of the silver strike when approved
220.127.116.11 When approved by the cognizant engineering organization, silver may be plated directly onto the substrate without the use of either the nickel or silver strike.
3.3.2 Except as specified herein, all parts, except nuts, shall be heated to 935 to 965F (502 to 518 C) after plating, rinsing and drying and held at heat for 20 to 60 minutes…
3.4.1 Thickness – Thickness of silver shall be as specified on the drawing
18.104.22.168 Where silver flash only is specified, plate thickness shall be approximately 0.0001 inch (2.5um)
22.214.171.124 Thickness of plate, other than flash, shall be as specified on the part drawing.
3.4.2 Composition – Silver as plated, shall be not less than 99.9% pure…
3.2.1 Parts shall be plated using a three-step process: nickel strike, silver strike, and silver plate. The nickel strike shall be 0.0005 inch (13um) maximum. The use of organic base grain refining and brightener additives shall be prohibited in both the silver strike and silver plate solutions.
126.96.36.199 When approved by the cognizant engineering organization, an alternative to nickel strike is permitted.
3.4.1 Thickness of the deposit shall be as specified on the drawing…
188.8.131.52 Nickel strike shall not exceed 0.0005 inch (13um)
184.108.40.206 Where silver flash is specified, plate thickness shall be approximately 0.0001 inch (2.5um)
3.4.2 Composition of the deposit shall be not less than 99.9% silver determined by a method acceptable to the cognizant engineering organization.
Silver Plating Services – AMS 2412 – Plating, Silver Copper Strike, Low Bake
3.2.1 Silver shall be plated over a preliminary plating of copper 0.0005 inch (13um) maximum. The copper strike may be omitted in plating copper and copper alloys, except for copper alloys containing zinc in quantities of 30% or more by weight. A nickel flash shall be used before the copper strike when plating corrosion-resistant steels.
3.3.2 Parts, except nuts shall be heated to 300-500F (149 to 260C) after plating, rinsing, and drying and held for not less than two hours, unless such heating would lower hardness to below drawing limits or otherwise deleteriously affect the parts, in which case heating shall be at the highest practicable temperature which will maintain specified properties. Thermal post treatment shall be in air, preferably in a circulating-air furnace.
Advanced Plating Technologies provides expertise in silver plating services to fulfill even the most demanding application. From prototyping and PPAP qualification to full production processing – it is our dedicated effort to exceed your expectations. The following points highlight why APT is a leader in silver plating services:
- Diversity of Substrates: Advanced Plating Technologies provides silver plating services on nearly any metallic substrate such as copper & copper alloys including beryllium, chromium and tellurium coppers, hardened and alloyed steels, stainless steels, Inconels, Hastalloys, Monels, ductile & cast iron and metalized plastics.
- Delicate and Difficult Geometries: Advanced Plating Technologies specializes in silver plating services on delicate parts employing patented oscillating, rock-and-roll, compartmentalized, vibratory and minimum part movement barrel technologies as well as custom-engineered rack fixturing when required to ensure even the most delicate parts are handled properly. APT has a working R&D relationship with several tooling manufactures that has lead to several patented designs.
- RoHS and REACH Compliance: Advanced Plating Technologies is at the forefront of environmental compliance and can certify our silver plating services as needed to the current RoHS, ELV and REACH regulations. This includes Grade A or Class N deposits that require a chromate application.
- Competitive Pricing: Advanced Plating Technologies has been providing quality silver plating services for over sixty years. Competitive pricing in silver plating services is paramount to gaining and maintaining our customers in today’s competitive global marketplace.
- Reliable Lead Times: With inventories leaner than ever, dependable turn-around is a core competency that we value highly to ensure the service our customers need.
- Value Added: Advanced Plating Technologies prides itself in meeting the customer’s needs. Whether it’s custom engineering packaging, vacuum or nitrogen sealed packaging to enhance storage, Kanban inventory management, light subassembly or multiple finishing combinations – APT will work with you to ensure we meet your needs in silver plating services.
- Extensive in House Analytical and Quality Lab Services: SPC is employed in all wet-lab work surrounding our silver 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.