I am working on a bracket that needs to be brass plated. It is a pretty simple machined part, and will need quantities of 500- to start. I am looking for a bright brass finish- was thinking brass plating would be the best way to accomplish this. What would be the best base metal to machine the part out of prior to plating?
The part is a right triangle approx 2.5 x 2.5 x 3/4" thick
Thanks
Peter
Brass. Use the real stuff.
Nearly any metal, steel, pot metal, aluminum can be plated. You specified "bright brass". You need to understand that for a bright finish, the base metal may require polishing first. Then cleaning, bright nickel plating, and a "flash" top coat plate of brass,or any other decorative metal. Now you have a reactive metal that will start tarnishing as soon as it comes out of the last rinse tank. It will require a clear finish on top of the plating. 30 years ago, I used lacquer. Now some low temp powder coating is available. Regular powder coating uses temps of around 350 F to fuse. This temp will discolor brass plate.
You also must consider how many sides are for appearance. Racking holes for the plater may be needed. Your simple part just got more complex. The same part done in antique brass, copper, nickel, is a bit easier to do, no polishing. The parts are immersed in a blackening solution after heavy brass plating ( no nickel) and then vibratory finished to get the desired "patina" look. Lay them out on a board, fire up the Binks #7 with lacquer, and call it a day.
You may be way ahead to just produce the parts from sheet stock, and polish and lacquer. 3/4 brass stock will not be inexpensive. Good luck!
Agree with iron toys here.
Art is finding the right balance between material costs and process costs. Brass plating tends to be a mega production thing were fractions of penny saved in cheap labour countries add up. By the time you've futzed around with the extra preparation, transport to and from a plater (if you can find one who does small quantity brass) and all the other hassles involved you will have more than eaten up any possible savings. Especially as its an inexpensive part anyway so nowhere much to save.
Brass plating has a well deserved reputation for short life looking good for only a couple or three years in anything outside a well protected environment. That sort of thing is a good way to earn a reputation as a trashy parts outfit. At least brass can be re-polished if the environment gets under the lacquer. For some reason folk are much more tolerant of lacquer or other clear coat breaking down after a few years and needing re-preparation underneath before re-coating. I guess the attitude is "It's paint innit.". Plating is expected to be forever.
Clive
You can see lots of brass plated steel hinges, handles and similar items in any hardware store, and probably in your own home. So you know steel can be cheaply brass plated if you have the plating shop and huge volume. You want to find a plating shop that does small volumes.
Meanwhile, consider making the part of aluminum and getting it anodized with a "gold" color. It will be more durable than lacquered brass plate and will look like quality.
How about a gold-color powder coat on steel? Probably cheaper than plating or anodized aluminum.
Larry
I have always heard stories about the rust belt/northeast, where industrial suppliers are plentiful and cheap, so, I suppose its possible you have platers out there that will do these cheap.
Where I live, I cant imagine a good bright brass plate on a part like this costing less than five bucks a part- and, at prices like that, I would be considering solid brass as well.
But in terms of material, I have found that cold rolled steel is the best compromise between price and quality for shiny plating jobs.
Hot rolled, with mill scale, is way too much work to clean up.
Cold rolled, usually , works well.
I had some black chrome brackets done in this size range, oh probably 20 years ago- and they were ten bucks a piece then.
Thanks for all the replies!
I am processing all of your input and definitely learning. The parts are meant to attach plexiglass slabs together, so all sides are visible. There are four tapped holes in them as well, so perhaps those could be used in the plating, powder coating or anodizing process as a method of holding.
I have a local shop that does plating, anodizing and powder coating. Was going to put the parts in the rfq section shortly, but wanted to have more knowledge first. I'll contact the plater to get their input.
i am working with another party on the design of this product, so this puts me in an area I am not used to. Normally I can design parts and spec finish on my own, This is definitely a learning process for me- new processes and new interactions.
Please keep the thoughts coming! I will update the thread at the end with pictures of the product.
Thanks
Peter
Stainless steel-plated brass is a composite material combining the advantageous properties of brass and stainless steel. This material is utilized in various industries due to its enhanced mechanical properties, corrosion resistance, and aesthetic appeal. This article provides a detailed examination of the properties, manufacturing processes, applications, and advantages of stainless steel-plated brass.
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What is Stainless Steel-Plated Brass?
Stainless steel-plated brass is a composite material where a layer of stainless steel is applied to the surface of a brass substrate. This plating process combines the strength, corrosion resistance, and aesthetic appeal of stainless steel with the cost-effectiveness and machinability of brass. The result is a durable, attractive material often used in applications requiring both functionality and a polished appearance, such as in hardware, plumbing fixtures, and decorative items.
Composition and Manufacturing Process
Brass
Brass is an alloy primarily composed of copper and zinc, with the proportions varying to achieve different mechanical and chemical properties. Commonly, brass consists of 60-70% copper and 30-40% zinc. The addition of other elements, such as lead, tin, and aluminum, can further enhance its properties.
Stainless Steel Plating
Stainless steel is an iron-based alloy containing a minimum of 10.5% chromium, which provides excellent corrosion resistance. Other alloying elements, such as nickel, molybdenum, and manganese, may be added to enhance specific properties like strength, toughness, and resistance to pitting and crevice corrosion.
The stainless steel plating process involves the deposition of a thin layer of stainless steel onto the brass substrate. This can be achieved through various methods, including:
- Electroplating: An electrolytic process where the brass component is submerged in an electrolyte solution containing stainless steel ions. An electric current is applied, causing the stainless steel ions to deposit onto the brass surface.
- Physical Vapor Deposition (PVD): A vacuum-based process where stainless steel is vaporized and then condensed onto the brass substrate, forming a thin, uniform coating.
- Chemical Vapor Deposition (CVD): A process where gaseous reactants form a solid stainless steel coating on the brass substrate through chemical reactions.
The manufacturing process typically involves the following steps:
- Preparation of Brass Substrate: The brass base is cleaned and polished to remove any impurities and ensure a smooth surface for plating.
- Electroplating: The brass substrate is submerged in an electrolyte solution containing stainless steel ions. An electric current is applied, causing the stainless steel ions to deposit onto the brass surface, forming a thin, uniform layer.
- Post-Plating Treatment: The plated brass may undergo additional treatments such as polishing, annealing, or coating to enhance its properties and appearance.
Properties of Stainless Steel-Plated Brass
Stainless steel-plated brass exhibits a unique set of properties derived from its composite nature. Here are the key properties of stainless steel-plated brass:
Applications of Stainless Steel-Plated Brass
Stainless steel-plated brass is a versatile material with a range of applications across various industries due to its unique combination of properties. Here are some key areas where this composite material is commonly used:
Plumbing Fixtures
Stainless steel-plated brass is commonly used in plumbing fixtures due to its combination of durability, corrosion resistance, and aesthetic appeal. The stainless steel layer provides enhanced resistance to water and chemical exposure, while the brass core offers the necessary strength and machinability.
Examples of products include:
- Faucets
- Valves
- Showerheads
- Pipe Fittings
- Toilet Tank Levers
- Shower Controls
Decorative Hardware
The material’s aesthetic appeal and robustness make it a popular choice for decorative hardware. The stainless steel plating provides a sleek, modern look while protecting the brass core from environmental wear.
Examples of products include:
- Door Handles
- Cabinet Knobs
- Drawer Pulls
- Architectural Trim
- Hinges
- Escutcheons
Electrical Components
In the realm of electrical components, stainless steel-plated brass offers a blend of conductivity and protection. The material’s electrical and mechanical properties make it suitable for various critical applications.
Examples of products include:
- Connectors
- Terminals
- Switchgear Components
- Relays
- Electrical Enclosures
- Circuit Breakers
Jewelry and Accessories
In the jewelry and fashion accessory industry, stainless steel-plated brass is favored for its combination of cost-effectiveness and visual appeal. The stainless steel layer provides a durable and stylish finish.
Examples of products include:
- Necklaces
- Bracelets
- Earrings
- Rings
- Watches
- Brooches
Industrial Components
Stainless steel-plated brass is used in industrial applications where a combination of mechanical strength and resistance to harsh conditions is crucial. The material’s properties contribute to its performance in demanding environments.
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Examples of products include:
- Machine Parts
- Precision Instruments
- Gaskets and Seals
- Fasteners
- Hydraulic Fittings
- Pumps
Advantages of Stainless Steel-Plated Brass
The advantages of stainless steel-plated brass include:
- Corrosion Resistance: The stainless steel layer provides excellent resistance to rust and corrosion, enhancing the durability of brass.
- Aesthetic Appeal: Stainless steel plating gives brass a polished, high-quality appearance, making it suitable for decorative and high-visibility applications.
- Strength and Durability: Stainless steel adds strength and toughness to the brass substrate, improving its overall mechanical properties.
- Cost-Effective: Combining stainless steel with brass can be more affordable than using solid stainless steel for some applications.
Stainless steel-plated brass, while offering many advantages, also has some potential drawbacks:
- Plating Wear: Over time, the stainless steel layer may wear off or become damaged, potentially exposing the brass underneath.
- Cost of Plating: The process of plating adds to the initial cost, which can be higher compared to using plain brass.
- Maintenance: While corrosion-resistant, stainless steel-plated brass may require maintenance to keep its appearance and performance optimal.
What Metals Should Not Be Used with Stainless Steel?
Certain metals should not be used in direct contact with stainless steel to avoid galvanic corrosion, which occurs when dissimilar metals are electrically connected in the presence of an electrolyte.
- Aluminum: Can cause rapid corrosion of stainless steel.
To prevent corrosion issues, it’s essential to use compatible materials or apply protective coatings when combining metals.
Will Brass and Steel Corrode Together?
Yes, brass and steel can corrode when used together, primarily due to galvanic corrosion. When brass and steel are in contact, especially in the presence of moisture, a galvanic cell can form, leading to the accelerated corrosion of the less noble metal. Steel, being more anodic compared to brass, is more likely to corrode. To prevent this, use coatings, gaskets, or insulating materials to separate the metals and reduce the risk of corrosion.
What is the Enemy of Stainless Steel?
The main enemy of stainless steel is chloride. Chlorides, commonly found in saltwater, de-icing salts, and certain chemicals, can cause pitting and crevice corrosion in stainless steel. Exposure to high chloride environments can compromise the corrosion resistance of stainless steel, leading to localized damage. To protect stainless steel, it’s important to minimize exposure to chlorides and use appropriate grades and protective measures.
How to Coat Stainless Steel with Brass?
To coat stainless steel with brass, follow these general steps:
- Surface Preparation: Clean the stainless steel surface thoroughly to remove any dirt, grease, or oxidation. This ensures better adhesion of the brass coating.
- Surface Activation: Apply a chemical treatment to activate the surface of the stainless steel, enhancing the bonding of the brass layer. This may involve acid etching or other surface activation methods.
- Brass Plating: Use an electroplating process to deposit a thin layer of brass onto the stainless steel. This involves immersing the stainless steel in a solution containing brass salts and passing an electric current through it, causing brass ions to adhere to the surface.
- Rinsing and Drying: After plating, rinse the coated stainless steel to remove any residual chemicals and dry it thoroughly.
- Finishing: Apply any additional treatments or coatings to protect the brass layer and achieve the desired appearance and durability.
This process enhances the aesthetic appeal and corrosion resistance of stainless steel components.
Does Brass and Stainless Steel Tarnish?
Yes, both brass and stainless steel can tarnish, though in different ways:
- Brass: Brass tarnishes over time due to oxidation and exposure to air and moisture. It often develops a dull, discolored layer, which can be cleaned or polished.
- Stainless Steel: Stainless steel is resistant to tarnishing due to its chromium content, which forms a protective layer. However, it can still develop discoloration or staining, especially if exposed to harsh chemicals or environments.
Regular cleaning and maintenance can help prevent tarnishing and maintain the appearance of both materials.
How to Prevent Galvanic Corrosion Between Brass and Stainless Steel?
To prevent galvanic corrosion between brass and stainless steel, consider these strategies:
- Use Non-Conductive Barriers: Install insulating materials, such as gaskets or coatings, between brass and stainless steel to prevent direct contact.
- Apply Protective Coatings: Use coatings or paints on the surfaces to isolate them from environmental factors that could cause corrosion.
- Select Compatible Materials: Choose materials that are less prone to galvanic corrosion or use brass and stainless steel in applications where contact is minimized.
- Regular Maintenance: Inspect and maintain the components regularly to ensure that protective measures remain effective and address any signs of corrosion promptly.
- Control the Environment: Minimize exposure to moisture, salts, and other corrosive elements that can accelerate galvanic corrosion.
These measures help reduce the risk of galvanic corrosion and extend the lifespan of the components.
Conclusion
Stainless steel-plated brass is a versatile material that leverages the strengths of both brass and stainless steel. Its unique combination of corrosion resistance, mechanical strength, and aesthetic appeal makes it suitable for a wide range of applications, from plumbing and decorative hardware to electrical components and jewelry. Understanding the properties and benefits of this composite material allows for informed decisions in its use and further innovation in its applications.
By carefully considering the specific requirements of each application, engineers and designers can fully exploit the advantages of stainless steel-plated brass, ensuring performance, durability, and visual appeal in their products.
Have an idea? Need a custom metal component? BOYI’s CNC machining services turn your vision into reality. Our engineers work closely with you to understand your needs, ensuring every detail is executed flawlessly. Whether you need one-off prototypes or mass production, we guarantee the highest standards of manufacturing excellence.
References
Contact us to discuss your requirements of Brass Plating Steel Strip manufacturer. Our experienced sales team can help you identify the options that best suit your needs.
- Callister, W. D., & Rethwisch, D. G. (). Materials Science and Engineering: An Introduction. Wiley.
- ASM International. (). ASM Handbook, Volume 5A: Thermal Spray Technology. ASM International.
- Davis, J. R. (). Stainless Steels. ASM International.
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