Diffusion Alloys
Diffusion Alloys is a UK-based specialist industrial coatings provider founded in 1955, applying protective diffusion coatings (aluminising, chromising, boronising) via pack cementation to metal components serving hydrogen, aerospace, nuclear, petrochemical, and process-industry customers.
- Company typePrivate
- Founded1955
- HeadquartersHatfield, United Kingdom
- Headcount—
- GTM typeB2B
- OfferingServices
What Diffusion Alloys does
Diffusion Alloys (UK) Ltd, headquartered in Middlesbrough, United Kingdom, is a specialist industrial coatings provider founded in 1955 and now operating as a subsidiary of AIM-listed Time To ACT plc. The company applies protective diffusion coatings to metal components using pack cementation — a solid-state process in which components are sealed with donor metal powders (aluminium, chromium, or boron), halide activators, and inert fillers, then heated so that vapour-phase species diffuse into the substrate to form metallurgically bonded protective zones rather than surface layers. Its core product set spans aluminising, chromising, boronising, and advanced duplex coatings, supported by in-house vacuum heat treatment, shot peening, and laboratory testing services. The company operates what is described as the world's longest aluminising furnace, capable of coating tubes up to 18.5 metres in length and components up to 3.5 metres in diameter.
The business model is project-based: revenue is generated through coating processing fees tied to component size, substrate material, geometry, coating type, and required diffusion depth, with pricing quoted per engagement rather than published. The go-to-market is enterprise field sales — direct technical engagement with design engineers, materials specialists, and production teams from development trials through commercial production — supplemented by sales representatives in France (EPM), Germany (CSG-Edenstahl), and Belgium. Customers are concentrated in hydrogen production (Johnson Matthey blue hydrogen LCH technology, deployed at H2H Saltend 600MW and other projects), solid oxide fuel cells and electrolysers (SolydEra), combustion engineering (Lanemark, 5,000+ burner plates per year over 10+ years), blast furnace steel manufacturing (Peel Jones Copper), and aerospace, nuclear, and petrochemical end-markets.
The company has completed a strategic reorganisation around clean technologies, exiting non-core business, relocating from Hatfield to Middlesbrough in 2022, and investing £1.5 million-plus in a new factory and centre of excellence at Teesport Commerce Park. It holds AS9100 Rev. D aerospace accreditation and Fit For Nuclear status, and offers REACH-compliant chromium VI-free slurry coatings, positioning it as a qualified supplier across regulated industrial end-markets.
Diffusion Alloys firmographics
Firmographics- Name
- Diffusion Alloys
- Legal name
- Diffusion Alloys (UK) Ltd
- Website
- https://diffusion-alloys.com
- Company type
- Private
- Founded year
- 1955
- Operating status
- Operating
- Short description
- Diffusion Alloys is a UK-based specialist industrial coatings provider founded in 1955, applying protective diffusion coatings (aluminising, chromising, boronising) via pack cementation to metal components serving hydrogen, aerospace, nuclear, petrochemical, and process-industry customers.
- Ownership category
- akta.pro rank
Diffusion Alloys industry classification
Industry- Product category
- Industrial Metal Coating Services
- NAICS
- Metal Coating, Engraving (except Jewelry and Silverware), and Allied Services to Manufacturers (332812), Coating, Engraving, Heat Treating, and Allied Activities (33281)
- SIC
- Coating, Engraving & Allied Services (3470), Paints, Varnishes, Lacquers, Enamels & Allied Prods (2851)
- akta.pro primary industry
- Industrial Protective Coatings (Steel/Concrete/Equipment) (IMAIAKAB)
- akta.pro secondary industry
- Industrial & Protective Coatings (IMAEAGAB)
Keywords
Where Diffusion Alloys is headquartered
LocationHeadquarters
- HQ city
- Hatfield
- HQ country
- United Kingdom
- HQ region
- Europe
Offices1 record
Markets served
Diffusion Alloys business model
Business model- GTM type
- B2B
- Offering type
- Services
- Cost components
- Personnel, Operations, Infrastructure, Supply Chain, Marketing or Sales, Technology or R&D
Revenue model
- Diffusion Coating Services: Diffusion Alloys provides bespoke diffusion coating services for industrial components. Services are project-based, covering coating application, process engineering, and technical support from early-stage development through to commercial production. Revenue is generated through coating processing fees tied to component size, material, complexity, and coating type. The company maintains long-term relationships with major customers across hydrogen, aerospace, energy, and petrochemical sectors.
- Long-Tube and Large Component Coating: Specialised coating capability for large-scale components including tubes up to 18.5 metres in length and components up to 3.5 metres in diameter, using the company's world-class long-tube aluminising furnaces. This niche capability commands premium pricing for complex, large-format industrial parts used in hydrogen reformers and process industries.
Go-to-market motion2 records
Distribution channels3 records
Marketing channels5 records
Diffusion Alloys product offering
Product offeringCore offering
Diffusion Alloys is a specialist provider of protective diffusion coating services with over 60 years of experience, applying pack cementation-based diffusion coatings (aluminising, chromising, boronising, and advanced/duplex coatings) that protect industrial metal components against high-temperature corrosion, oxidation, carburisation, sulfidation, metal dusting, hydrogen embrittlement, and wear. The company also offers in-house vacuum heat treatment, shot peening, custom coatings development, and laboratory testing services from its Middlesbrough manufacturing centre of excellence.
Product overview
Diffusion Alloys is a specialist provider of protective diffusion coating services with over 60 years of experience. The company's core product portfolio centers on pack cementation-based diffusion coating technologies including Aluminizing, Chromizing, Boronizing, and Advanced/Duplex Coatings. These coatings protect industrial metal components against high-temperature corrosion, oxidation, carburisation, sulfidation, metal dusting, and wear. The offerings are complemented by Lab Services for testing and analysis, Coatings Development for custom solutions, and supporting processes including Vacuum Heat Treatment and Shot Peening. Variants such as Calorizing (for copper), Alonizing, and Chromium VI-Free Silicon Aluminide Slurry extend coverage to specific materials and environmental requirements. The company serves Clean Technology, General Industrial, and Process Industries sectors.
Differentiator
Problem solved
Functional benefit
Products and services
- Aluminizing
Quantifiable outcome
- More than doubling of burner plate life expectancy (from 3–5 years to over 10 years) under metal dusting conditions through aluminide diffusion coating on Incoloy 800 plates for Lanemark Combustion Engineering
- +3 more outcomes
Companies that use Diffusion Alloys
Customer profileNamed customers4 records
Segments4 records
Ideal customer profiles4 records
Diffusion Alloys technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature6 records
Diffusion Alloys partnerships and signals
Strategic signalPartnerships
Two partnerships are on record, tiered core.
- SolydEracoreDiffusion Alloys serves as SolydEra's coater of choice under a strategic collaboration supporting the scaling of multi-stack SOFC (Solid Oxide Fuel Cell) and SOE (Solid Oxide Electrolyser) solutions to 100kW and beyond. SolydEra is Italy-based and has the largest annual production capacity in Europe for Solid Oxide Cells, Stacks, and Solutions. The partnership formalises a decade-long relationship and positions Diffusion Alloys as a key player in the solid oxide technology supply chain for clean energy.
- Johnson MattheycoreStrategic partnership to scale-up production of coated components for Johnson Matthey's low carbon (blue) hydrogen offering. JM's LCH™ (Low Carbon Hydrogen) technology enables hydrogen production with up to 99% CO₂ capture. The partnership ensures a robust supply chain for coated components deployed in JM's blue hydrogen projects including H2H Saltend (600MW in Humber, UK), HyNet, and a major North American project. Diffusion Alloys is referred to by JM as 'the best in the world at what they do'.
Scale indicators7 records
Recent moves8 records
Expansion highlights6 records
Diffusion Alloys competitors and assessment
Company assessmentDirect peers
- Bodycote plc: Bodycote is the world's largest dedicated thermal-processing services provider, offering heat treatment and surface technology services including aluminising, chromising, and other diffusion coatings from a global facility network. Diffusion Alloys competes most directly with Bodycote's Specialist Technologies / Surface Technology division on diffusion coatings for aerospace, automotive and industrial gas turbine customers.
- Chromalloy: Chromalloy is a leading independent supplier of engineered coatings, repair technologies and gas-path components for industrial gas turbines and aerospace engines. Its aluminide and chromide diffusion coatings and turbine component services compete directly with Diffusion Alloys' aero/IGT product lines for turbine blade, vane, and combustor customers.
- ASB Industries: ASB Industries (Air Products subsidiary) operates thermal-spray and diffusion-coating lines for industrial and aerospace components, including aluminide and chromide diffusion services. Its process portfolio and customer base overlap with Diffusion Alloys' diffusion coating services for high-temperature alloy protection in aerospace and process industries.
- Curtiss-Wright Surface Technologies: Curtiss-Wright Surface Technologies applies wear-resistant, corrosion-resistant and high-temperature coatings (including diffusion coatings) for aerospace, defence, oil & gas, and industrial customers. It competes with Diffusion Alloys for aerospace/IGT diffusion coating work, particularly on aluminium, steel, and titanium substrates.
Broad incumbents
- Praxair Surface Technologies (Linde): Praxair Surface Technologies (now part of Linde) applies wear- and corrosion-resistant coatings to aerospace, industrial gas turbine and energy components via diffusion, slurry, and thermal spray methods. It overlaps with Diffusion Alloys' aluminising, chromising and slurry coating capabilities on industrial gas turbine and energy customers, but at much broader scale.
- Oerlikon Balzers / Oerlikon Metco: Oerlikon's surface solutions divisions (Balzers and Metco) offer PVD, CVD, PACVD, thermal spray and aluminising coatings for aerospace, automotive, energy and industrial customers. They overlap with Diffusion Alloys on turbine, hydrogen reformer and turbomachinery coatings, but as part of a much broader portfolio rather than specialising in pack cementation.
- Howmet Aerospace: Howmet Aerospace produces engine components and applies proprietary diffusion (aluminide, platinum-aluminide) coatings and other surface treatments in-house for jet engine and industrial gas turbine blades and vanes. While primarily a component manufacturer that captures coating in-house rather than a service specialist, its coating capability competes for the same aerospace and IGT diffusion coating workload.
Regional players
- Wallwork Heat Treatments: Wallwork is a UK-based heat treatment and vacuum heat treatment service provider serving aerospace, motorsport, oil & gas, and industrial customers. It overlaps with Diffusion Alloys' vacuum heat treatment and shot peening add-on services for UK aerospace and industrial customers, with both firms based in Northern England.
Others
- Höganäs AB: Höganäs is the global leader in metal powders for surface coating, brazing, and additive manufacturing, supplying alloy and chromium-bearing powders used as inputs in diffusion-coating recipes and thermal spray consumables. It is upstream to Diffusion Alloys rather than a direct competitor, but its surface-coating powder business intersects technologically.
- Kennametal (Stellite alloy business): Kennametal produces Stellite cobalt-chromium alloys and tungsten carbide surface products used for wear and corrosion protection at high temperatures. While not a service provider of diffusion coatings, its materials supply into similar hydrogen, petrochemical, and turbomachinery protective-coating applications adjacent to Diffusion Alloys' chromising and boronising services.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat5 records
Key risks5 records
Key highlights7 records
Customer concentration
Diffusion Alloys social profiles
Digital presenceDiffusion Alloys compliance and trust
Trust signalCompliance5 records
Diffusion Alloys financial estimates
Financial estimateRevenue estimate
Valuation estimate
Diffusion Alloys leadership team
Management profileNumber of profiles
Profiles2 records
Diffusion Alloys funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Diffusion Alloys M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Diffusion Alloys
What does Diffusion Alloys do?
Diffusion Alloys is a specialist provider of protective diffusion coating services with over 60 years of experience, applying pack cementation-based diffusion coatings (aluminising, chromising, boronising, and advanced/duplex coatings) that protect industrial metal components against high-temperature corrosion, oxidation, carburisation, sulfidation, metal dusting, hydrogen embrittlement, and wear. The company also offers in-house vacuum heat treatment, shot peening, custom coatings development, and laboratory testing services from its Middlesbrough manufacturing centre of excellence.
Is Diffusion Alloys a public or private company?
Diffusion Alloys is a private company. It is classified as corporate owned and is currently operating.
When was Diffusion Alloys founded?
Diffusion Alloys was founded in 1955.
Where is Diffusion Alloys based?
Diffusion Alloys is headquartered in Hatfield, United Kingdom, in the Europe region.
How does Diffusion Alloys make money?
Two revenue lines are on record. Diffusion Coating Services are the primary driver. The others are long-Tube and Large Component Coating.
Who are Diffusion Alloys's main competitors?
Direct peers on record are Bodycote plc, Chromalloy, ASB Industries and Curtiss-Wright Surface Technologies. Broad incumbents are Praxair Surface Technologies (Linde), Oerlikon Balzers / Oerlikon Metco and Howmet Aerospace. Wallwork Heat Treatments is listed as a regional player. Others are Höganäs AB and Kennametal (Stellite alloy business).
Does Diffusion Alloys have an API?
No public API is recorded for Diffusion Alloys.
What industry is Diffusion Alloys in?
Diffusion Alloys's product category is Industrial Metal Coating Services. Its primary akta.pro industry code is IMAIAKAB, Industrial Protective Coatings (Steel/Concrete/Equipment), with a secondary code of IMAEAGAB, Industrial & Protective Coatings. Its NAICS code is 332812 and its SIC code is 3470.