Diffusion Alloys offers wear resistant diffusion coatings for industrial applications. Our deep knowledge base and over 60 years of experience makes Diffusion Alloys a global specialist in protective coatings for wear resistance


Boronising, sometimes referred to as boriding, is a diffusion coating with a low co-efficient of friction that is capable of retaining its high hardness at elevated temperatures.

Diffusion Alloys are capable of boronising a wide range of metal base layers including nickel, cobalt, tungsten carbide and most ferrous alloys without sacrificing the corrosion-resistance or mechanical properties of the base material. Boronising is used in a wide range of applications and industries. It is commonly used to produce glass bottle moulds, plungers, dies, tooling and for components in the oil & gas and turbomachinery industries.

For more information on our boronising process please click here.


Diffusion Alloys was the first company globally to launch chromising as a commercial industrial diffusion process. With 60 years of experience in applying chromide coatings we working closely with our customers to provide specified or customised chromide coatings that satisfy specific requirements for wear and/or corrosion resistance.

Chromide coatings are used on a wide range of components, including chain pins, sprags, levers, rods, locators, seals and tubes.

For more information on our chromising process, please click here.

Aluminizing / Calorizing

Aluminizing and calorizing by Diffusion Alloys infuse aluminium into materials, fortifying against corrosion. Originating in Tyco Van Aller’s 1911 patent, these processes, including Alonizing™, enhance steel and alloy longevity. Diffusion Alloys (DA) leads pack aluminizing, crucial for resisting metal dusting, carburization, oxidation, and sulfidation. Process versatility accommodates various substrates, ensuring reliability through stringent quality control measures.

For more information on Aluminizing / Calorizing, please click here.

We are at the forefront of applications for clean energy and the hydrogen industry.

Large-scale hydrogen generation

Hydrogen electrolysers (SOE)

Fuel cells (SOFC)

Energy storage


Other specialist life extension

With over 60 years of industry experience, we're a global specialist in the application of a range of protective coatings against metal degradation.

We have been supplying diffusion coating services for over 60 years. In 1955 the Company became the first company world-wide to launch chromising as a commercial industrial diffusion coating.


We have decades of experience in coatings for the industrial gas turbine market and the oil, gas and process industries and have developed a leading position in diffusion coating for clean technology applications.


We consider the Health & Safety of its employees, customers, visitors and the general public to be of prime importance. We take an ethical approach to our environmental responsibility & waste management.


We pride ourselves on consistently scoring as best coating supplier for quality with a number of our major and long term customers which is testimony to our quality management system.