Everlube
Everlube Coating Magnets
The new Everlube anti-corrosion magnet coating combats the increasingly arduous working environments for magnets and magnetic components. The Everlube coating prevents oxidation and deterioration of high-powered permanent neodymium rare earth magnets.
Neodymium magnets can utilize various organic coatings, such as epoxy, polyurethane, acrylic, and Parylene. Although these coatings are often applied in other sectors, multiple companies have created custom formulations to improve the magnet substrate’s protection. For example, Everlube Products, now under Curtiss-Wright Corporation, launched a series of epoxy-based coatings in the 1990s, specially developed to enhance durability and corrosion resistance.
Everlube Coating Magnets
Everlube 6155 is particularly advised for Neodymium magnets to fulfill their protective requirements. It’s an aluminized barrier coating with fine aluminum flakes, designed to optimize adhesion and corrosion protection for Everlube coated magnets. This Everlube coated magnet, treated with these coatings, provides excellent resistance to wear, corrosion, and environmental damage, making such coated magnets perfect for harsh, demanding applications.
Some permanent magnets, including neodymium, react negatively to exposure to water or humid conditions. In neodymium magnets, the neodymium-rich layers at the grain boundaries react to form neodymium hydroxide. The effect of this conversion from Nd to Nd(OH)3 is a large volume increase along the grain boundaries, leading to cracking and degradation of magnet properties. The speed of this is enhanced when salt is present. The Everlube coating prevents such degradation.The Everlube coating was originally developed as a brand of dry film lubricant products specifically designed to enhance and improve the performance of critical components and meet a wide variety of industry, defence, and customer specifications for critical components.
The original Everlube coating was a thermoset coating, containing PTFE, molybdenum Di-Sulphide (MoS2) and phenolic resin adhesive. Everlube is an aluminised barrier coating specially formulated to maximize adhesion and corrosion protection when applied to rare earth magnets. The coating is very durable and provides excellent chemical and corrosion resistance to a wide range of substances including aviation fuel and anhydrous ethanol.
The application of an Everlube coating to a magnet surface is more complex than a NiCuNi coating or an Epoxy Coating or even a dual NiCu+Epoxy Coating. However, it has distinct advantages including significantly improved corrosion resistance, a much better range of chemical compatibility, and excellent quantified performance when exposed to salt spray in a minimum 500 hours test environment. The coating also provides a 4H coating hardness.
Everlube coated neodymium magnets are ideally suited for high-performance applications in the automotive sector, especially for electric vehicles (e.g. motors), aerospace, and electronics. Free samples of new Everlube coated neodymium magnets are available on request.