Chrome Coating for Magnets

Table of Contents

Chrome coating is one of the most common surface treatment techniques, also name chrome plating. We use it to improve the appearance and durability of objects made from a variety of materials, including metal, plastic, and wood. You can easily notice their common applications on automotive and motorcycle parts, such as wheels and trim, as well as on household and industrial products, such as faucets and appliances. 

Chrome coating for neodymium magnets is a technique to apply a thin layer of chromium onto a neodymium magnet. And a neodymium magnet with a highly glossy surface is very likely to be with chrome plating. And the major purpose is to protect the neodymium magnet from corrosion and wear.  

The most common method is to use a technology known as electrocoating – which uses electricity – to deposit chromium layers onto the surface of a workpiece. And the chromium layers that can be less than 0.025 mm (0.001 inch).  

 

Basics of chrome coatings

One of the main advantages of chrome coating is its ability to resist corrosion. This makes it ideal for protecting neodymium magnets, which tend to corrode quickly in a wet working environment.  

It is also highly durable and able to withstand wear and tear, making it suitable for uses like neodymium magnet balls – you may touch them quite often to build different patterns.  

However, chrome plating can be brittle and may chip or crack if it is subjected to heavy impacts or abrasions.  

Overall, chrome coating is a good choice for neodymium magnets due to its combination of appearance, durability, and corrosion resistance. 

 

Applications of Chrome coating

Besides neodymium magnets, chrome plating also has a wide range of applications of products and industries, thanks to its combination of appearance, durability, and corrosion resistance.  

Some common applications for chrome coating include: 

  • Automotive and motorcycle parts:  often used on wheels, bumpers, and trim for cars, trucks, and motorcycles.
  • Home appliances: It is often used on household appliances, such as refrigerators, ovens, and dishwashers, to improve their appearance and durability.
  • Industrial equipment: Chrome coating is often used on industrial equipment, such as conveyor belts, pumps, and valves, to improve their appearance and reduce wear and tear.
  • Medical equipment: Chrome coating is often used on medical instruments, such as scalpels and forceps, to improve their durability and sterilizability.
  • Furniture and decorative items: Chrome coating is often used on furniture and decorative items, such as lamps and figurines, to improve their appearance and durability.
  • Sporting goods: Chrome coating is often used on sporting goods, such as golf clubs and ski poles, to improve their appearance and durability.
  • Marine equipment: Chrome coating is often used on marine equipment, such as boat trailers and propellers, to improve their appearance and resistance to corrosion.

 

Features of Chrome coating

Osenc is able to offer neodymium magnets with several types of surface treatment. Some look similar, but actually, they have different features worth mentioning. There are several key features that distinguish chrome coating from other types of coatings, such as nickel and zinc: 

  • Appearance: It is known for its high-shine, reflective appearance, which makes it popular for use on automotive and motorcycle parts and other decorative items. And it is worth considering if your neodymium magnets are for decorative purposes.
  • Durability: Highly durable and able to withstand wear and tear, making it suitable for use in high-stress applications.
  • Corrosion resistance: Highly resistant to corrosion, making it ideal for use in outdoor and marine environments.
  • Sterilizability: It is resistant to bacteria and other microorganisms, making it suitable for use on medical instruments and other equipment that requires sterilization.
  • Adhesion: Has good adhesion to a variety of substrates, including metal, plastic, and wood.

 

Types of chrome coating techniques

There are several types of chrome coating, including: 

 

Electroplated chrome 

Electroplated chrome is a type of chrome coating that is applied to the surface of an object by means of an electrical current. Electroplated chrome is known for its high-shine appearance and good adhesion to a variety of substrates. 

Vacuum-deposited chrome  

Vacuum-deposited chrome is a type of chrome coating that is applied to the surface of an object by means of a vacuum chamber. Vacuum-deposited chrome is known for its high-quality appearance and good adhesion to a variety of substrates. 

Thermal spray chrome 

Thermal spray chrome is a type of chrome coating that is applied to the surface of an object by means of a high-velocity flame. Thermal spray chrome is known for its good adhesion and high-temperature resistance. 

PVD (Physical Vapor Deposition) chrome 

PVD chrome is a type of chrome coating that is applied to the surface of an object by means of a physical vapor deposition process. PVD chrome is known for its high-quality appearance and good adhesion to a variety of substrates. 

Powder-coated chrome 

Powder-coated chrome is a type of chrome coating that is applied to the surface of an object by means of a powder-coating process. Powder-coated chrome is known for its high-quality appearance and good adhesion to a variety of substrates. 

 

The process

Chrome coating is offered through two main processes: hexavalent chromium coating and trivalent chromium coating. 

  • Hexavalent chromium coating is a traditional form of chrome coating and is mostly used for functional purposes.
  • Trivalent chromium coating is the eco-friendly solution to the traditional chrome coating option and uses chromium sulfate or chromium chloride as key ingredients in replacement of chromium trioxide.

 

Hexavalent chromium 

Hexavalent chromium coating, we also call hex-chrome, Cr6+, and chrome (VI) coating, uses chromium trioxide (also known as chromic anhydride) as the main ingredient.  

Hexavalent chromium coating solution is used for decorative and hard coating, along with bright dipping of copper alloys, chromic acid anodizing, and chromate conversion coating. 

Disadvantages 

From the point of view of health, hexavalent chromium is the most toxic form of chromium. For this reason, Osenc doesn’t recommend using this coating technique.  

 

Trivalent chromium 

Trivalent chromium coating, also known as tri-chrome, Cr3+, and chrome (III) coating, uses chromium sulfate or chromium chloride as the main ingredient. 

Advantages 

The functional advantages of trivalent chromium are higher cathode efficiency and better throwing power, which means better production rates. 

From the point of view of health, trivalent chromium is intrinsically less toxic than hexavalent chromium. Because of the lower toxicity it is not regulated as strictly, which reduces overhead costs.  

 

Decorative vs hard chrome coating

Chrome coating is often categorized as either decorating or hard, depending on the thickness of the chromium layer it’s used to create.  

 

Decorative chrome coating 

Decorative chrome coating typically ranged from just 0.05 to 0.5 micrometers thick. It’s used on workpieces and objects made of a variety of materials, some of which include aluminum, low-carbon steel, high-carbon steel, plastic, copper, and various alloys. 

  • Improved appearance: Decorative chrome coating provides an appealing shine and smooth, sleek surface. When used on neodymium magnets as consumer products, decorative chrome coating can increase their perceived value.
  • Corrosion resistance: Decorative chrome coating protects neodymium magnets from corrosion due to chemicals or other oxidizing agents.
  • Easy cleaning: Due to its corrosion resistance, decorative chrome coating is easy to clean with household cleaners and chemicals. Its smooth surface also does not trap dirt and dust particles, so products with decorative chrome coating can continue to shine for long-term use.
  • Some wear resistance: Decorative chrome coating can increase the strength of a product to some degree. However, because it is so thin, it is also fairly easy to damage.

 

Hard chrome coating 

Hard chrome coating is substantially thicker. It’s typically preferred because of its increased strength and durability. With greater thickness, hard chrome coating allows for the production of a strong and durable outer layer that’s naturally protected against degradation. 

  • Superior hardness: Hard chrome coating is harder than most other industrial abrasives and metallic coatings, measuring between 68 and 72 HRC. 
  • Durable thickness: Depending on the specific application, it is possible to apply hard chrome coating in various thicknesses to meet the project needs. Hard chrome coating between 10 and 500 micrometers will provide a hardness of about 68 to 69 HRC. It offers excellent resistance to abrasion and wear to extend component lifespan.
  • Low deposition temperature: Applying hard chrome coating at low temperatures ensures the physical and mechanical properties of the substrate remain unaffected during the coating
  • Wide range of bases: Hard chrome coating can apply to a wide range of base metals to suit various industrial applications – stainless steel, alloys of copper, aluminum, titanium, bronze, brass, and nickel. 
  • Excellent adhesion: Offering long-term durability, hard chrome coating has excellent adherence to many substrates with minimal risk of flaking. 
  • Low friction: Hard chrome coating creates very little friction when in contact with metals, graphites, carbons, and polymers.
  • Wear and abrasion resistance: Because of its hardness and low friction, hard chrome coating is exceptionally resistant to wear. 
  • Corrosion resistance: Hard chrome coating is a poor corrosion protector. It only gives approx. 48 hours in NSST (neutral salt spray testing).

Above is a brief introduction to chrome coating for neodymium magnets. Feel free to contact Osenc if you need help with customer neodymium magnets. 

What Are Neodymium Magnets?

Neodymium magnets are super permanent magnetsIt is commercially availableThey are more expensive than other magnets since it made of rear earthThey have many advantages that make them such desirable materials in so many industriesTheyre strongersmaller and more versatile than any other commonly used magnet.

Chrome Coating

Shapes

Customers get a large variety of shapes when they need to choose from different neodymium magnets in shape, strength, and size. The neodymium magnets are popular and versatile for their unique shapes and magnetic strength. Neodymium magnets are manufactured from the boron, iron, and neodymium and the mixture of these three elements transforms these magnets into the strongest and the most powerful available magnets on the planet Earth.

Different applications require different shapes of neodymium magnets. Design magnets serve the purpose of producing something creative and artistic and sometimes you need small, simple, and powerful magnets. But now, you do not need to search out the market for different shapes because Osenc can provide you with a variety of shapes. Osenc manufactures neodymium magnets in disk countersunk, squares, spheres, rings, square countersunks, disks or rod, etc.

Arc Magnet

Bar Magnet

Countersunk Magnet

Cylinder Magnet

Disc Magnet

Ring Magnet

Cone Magnet

Ball Magnet

Custom Magnet

Coatings

All the above shapes of magnets come in different coatings because the coating prevents rusting. The most common coating for neodymium magnets is nickel-copper-nickel or copper-nickel plating. A good choice for neodymium magnets is Zn coating because of its attractive price. visit here to know more about the neodymium magnet coating.

Size

When buying neodymium magnets, make sure that you are choosing the size of magnet that fulfill your need. Osenc can manufacture the magnet as small as 0.2mm and as large as 200mm.

Grades

What does it mean by N35, N38, N42,….?

Neodymium magnets are actually graded by the material from which they are made of. As a rule, the higher grade (a number following ‘N’), the stronger the magnet will be. Currently, the highest grade of neodymium magnet available is N52. A letter that is following a grade refers to the temperature rating of the magnet. The magnet will be standard temperature neodymium if there is no letter following the grade.

Directions Of Magnetization

Neodymium magnets have their own respective corresponding magnetization directions according to their sizes and shapes. For example cylinder and the disc magnets can be diametrically and axially magnetized and for the neodymium sphere magnets, only axial magnetization is present.

Manufacturer Of Neodymium Magnets

Osenc, you can get the best types of neodymium magnets with every shape, size and strength according to your requirements and needs. We do not compromise on quality. Our focus is to provide you with high end quality neodymium magnetic products because we are the best manufacturers of neodymium magnets. Our magnets are delivered throughout the world because we are a factory of neodymium magnets and produce the strongest neodymium magnets.

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