To further protect fasteners, various coatings and platings are applied.
A finish that offers minimal corrosion resistance but is useful for reducing light reflection.
Provides an inexpensive, thin layer of zinc for basic corrosion resistance, suitable for dry, indoor environments.
HDG is ideal for outdoor, marine, or harsh environments where fasteners are exposed to moisture and salt.
Advanced anti-corrosion coatings, like Dacromet or Geomet, are used in outdoor and automotive applications for high performance.
These are the most common and cost-effective corrosion protection for steel fasteners.
Specialist coating that provides exceptional resistance to chemicals, acids, and solvents, often used in aggressive environments like chemical plants and refineries.
A chemical process that removes "free iron" from the surface of stainless steel, allowing the natural protective oxide layer to form completely. This enhances the steel's corrosion resistance.
An aluminium oxide coating (Al₂O₃), also known as an alumina coating, is a highly durable ceramic layer applied to various substrates to enhance their surface properties.
Provides good corrosion resistance and is often used for engineering applications due to high conductivity and wear resistance.
Offers low friction and excellent chemical resistance, making it suitable for harsh environments.
While offering corrosion resistance, it is often used for its aesthetic finish on visible components.
An electrochemical process that thickens and toughens the natural oxide layer on aluminum fasteners, dramatically increasing corrosion and wear resistance.
Used in harsh environments, these coatings provide protection against salt spray and can withstand high temperatures.
A modern, eco-friendly replacement for cadmium, offering superior corrosion resistance, especially in harsh conditions.
This chemical treatment deposits a layer of phosphate crystals on steel fasteners, offering mild corrosion resistance and serving as an excellent base for paint or other coatings.
A Titanium Carbonitride (TiCN) coating is an advanced, high-performance ceramic layer used on tools and components to increase hardness, reduce friction, and significantly extend service life compared to standard Titanium Nitride (TiN).
An older method, now less common due to toxicity, offers good corrosion resistance.
Polyolefin coatings are a specific type of thermoplastic coating made from polyolefin polymers such as polyethylene and polypropylene.
Powder coating is a dry finishing process where a free-flowing, dry powder is applied to a surface, typically metal, and then heated to create a tough, durable, and long-lasting finish.
A manganese phosphate coating is a specialized, durable crystalline conversion coating applied to steel, iron, and other ferrous metal parts to provide superior wear resistance, anti-galling properties (prevention of cold welding), and corrosion protection.
