We carry out surface fishing on magnets for various reasons. These may include prevention of corrosion, for aesthetic purposes and to enhance the magnet’s durability.
They can also improve both the reflectivity and conductivity of any given magnet. Settling on a specific type of fishing for your magnet is very important.
Benefits of Magnet Fishing
Most magnets are composed of alloys which enhance their physical traits and magnetic properties. However, the fact that we have iron in them exposes them to vagaries of weather and operation such as rust.
To prevent such, you need to carry out certain fishing procedures on your magnet’s surface. Here are some of the benefits you can achieve by doing so:
· Resistance to Rust –Surface Fishing your magnet can protect it from the oxidation that brings about corrosion. This will reduce its deterioration and prolong your magnet service life.
Improved Physical Appearance- If you carry out Magnetic Surface Fishing to its best, then your magnet will be visually appealing to everyone. Several types of surface finishes also bring out the best aesthetic value in your magnet.
· Durability – Besides preventing corrosion, some surface finishes such as plastic coating can protect your magnet from breakages and wear. This prolongs your magnet service life, especially in applications that are demanding.
Choosing the Right Magnet Fishing
Consider the following factors when you want to choose the best magnet fishing for your application:
·Application – Your application environment has constant conditions such as temperature or corrosive elements. Go for a surface finish that gives your magnet maximum protection without significant reaction to such conditions.
· Aesthetics – Some applications will require your magnets to have a visual appeal. Choose a surface finish for a magnet that offers the best visual appeal while at the same time offering maximum protection to your magnet.
· Budget – It all boils down to the money. In as much as cost is an issue, go for a quality finish that will eventually save you money because of the extended magnet service life.
· Industry Regulations – Some industries such as food processing and medical services have regulatory requirements for magnetic usage. You should ensure that the type of magnet fishing you choose satisfies the application standards.
Types of Magnet Fishing
You will find a very broad list of alternative finishes on magnets for your magnet. You will have to factor in things like temperature, working environment, or government regulations to settle on the best finish.
Let us have a look at some of the common options you will find as magnet surface finishes. Be sure to take into consideration your application parameters while going through these options.
· Nickel Coating
This is the most common surface finish you will find on magnets. It is composed of three layers placed as nickel-copper-nickel to safeguard your magnet against corrosion.
However, it does not prevent other limiting factors such as humidity or salt water. On the upside, it offers some form of protection that prevents your magnet from chipping.
Its appearance is a shiny metallic gray color and can also be used as a decorative finish. With a thickness of about 15-25µm, it is relatively cheap.
You will find its application in magnets used in motors, medical equipment not used in internal body applications and many more. You can use this fishing on magnets in almost every industry using magnets.
· Spray Teflon
This is a Magnet Fishing that has been certified as a food-grade coating. In as much as you will require tooling to apply it, it gives your magnet the best protection against corrosion.
The coating also prevents the entry of any fluids or even humidity. However, you must handle your coated magnet with care since this finish is prone to scratches.
Their physical appearance is normally in black or white color with a thickness of about 20-25µm. Having a medium cost of purchase, you can comfortably operate your magnet to temperatures of about 250°C.
They have very poor adhesion if you are to stick your magnet on a plastic or steel surface. You can only apply this type of finish specifically on applications in the food and medical industries.
You can shape your magnet by grinding it as a Fishing process. You can carry out this operation using a grinding wheel to achieve a smooth surface finish.
You can vary the grinding speed to get various types of finished magnetic surfaces. These will achieve surface finish grades based on the hardness of the material.
· Gold Plating
The coatings of this Finish are nickel copper nickel and are safe for use in internal human body applications. In as much as it protects your magnet from corrosion, it offers less when humidity and salt water are involved.
It will cost you a lot as a fishing on magnets and it has a thickness range of 0.1 to 1µm. It can withstand working temperatures of up to 200°C.
You will find its application mostly in the medical industry where it can be used inside and outside the body. You can also use it for decorative purposes and in jewelry.
· Zinc Plating
You can easily glue the Finished magnet on a metal surface since this finish has excellent adhesion. It protects your magnet from corrosion but does not work well in moist or fluid environments.
It has a thickness of about 4 to 10µm will cost you very little money. It can function well at temperatures as high as 120°C.
We mostly use it in applications having low-temperature requirements with low coating budgets. These applications also require minimal protective barriers for the magnet.
· Rubber Finish on Magnets
This finish can offer your magnet the best protection against direct impact, random breakages and corrosion. It also prevents any friction between the magnet and the application surface.
Since you will require molds and tooling, it will cost you a bit more. You will also require a mechanical hold when placing your magnet in its application area as opposed to gluing it.
Your magnet can work well in temperatures that don’t exceed 135°C. You can use it for various industrial applications and holding applications.
· Chrome Plating
We apply these magnet finishes mainly for decorative purposes. They offer your magnet protection from corrosion but not efficiently compared to Nickel.
They normally have a dull metallic gray appearance with a thickness of about 12 to 15µm. You can acquire them at a low-medium cost and will serve your applications that do not exceed 200°C.
The industries you will find with most of this fishing application are decorative and jewelry. You will also find some consumer products having this magnet fishing.
· Copper Plating
Copper offers your magnet protection from corrosion. This type of magnet fishing is mostly used for decorative purposes and rubs off easily over time.
It will not cost you that much to apply it, since it has medium pricing. It has a thickness of about 10 to 20µm and works in maximum temperatures of about 200°C.
· Plastic Coating
This Fishing protects your magnet from hard impacts, corrosion, and any form of breakages. We usually plastic coat medium to large-sized magnets as it is not feasible for small magnets.
With a thickness of 1 to 2mm, their maximum operating temperature relies heavily on the type of plastic used. You can apply this Fishing in the medical and consumer goods industries.
· Molded Teflon
If you’re applying this magnet fishing, you will need molds and some tooling. Just like plastics, they protect your magnet from corrosion and any form of breakage from direct impact.
You will find this fishing in white color with a thickness of about 1.5 to 3mm. The tooling and mold requirements will raise the amount you will spend on it.
They operate at temperatures not exceeding 250°C. Just like sprayed Teflon, these finishes are exclusively used in the medical and food industries.
· Rhodium Coating
This type of Fishing gives your magnet a very strong coating that can withstand scratches and any form of tarnish. This white reflective finish also protects it against corrosion.
It has an aesthetic appearance with a thickness of about 1 to 5µm. You can use it in applications such as medical, automotive, or decorations with maximum operating temperatures of about 200°C.
· Anti-Rust Oil
You can coat your magnet by applying a thin film of this oil on its surface. This method is called impregnation and enhances your magnet’s anti-rust abilities without altering its appearance or size.
This process is very simple and efficient for you to carry out. You can use it in magnets that have small bores.
You can use this magnet surface finish as the best solution for slat water and air contamination. However, you must be cautious while handling it during assembly since it is highly susceptible to scratching.
It is commonly found in black although you can apply a white one as well. With operating temperatures reaching around 200°C, you can best use it in the automotive industry, in sensors, and in some consumer goods.