🔧 Hard Sulphuric Anodising (Type III) – Premium Aluminium Surface Treatment
Hard sulphuric anodising, also known as Type III hard anodising, is a high‑performance surface treatment designed to significantly increase the durability, wear resistance, and corrosion protection of aluminium components. This advanced anodising process is widely used across engineering and manufacturing industries where long‑lasting performance is essential.
⭐ Why Choose Hard Sulphuric Anodising?
- Exceptional Wear Resistance Hard anodising creates a dense, ultra‑hard oxide layer that dramatically improves surface hardness — ideal for components exposed to friction, abrasion, or heavy mechanical loads.
- Outstanding Corrosion Protection The thick anodised coating provides superior resistance to moisture, chemicals, and harsh operating environments, extending the lifespan of aluminium parts.
- Improved Thermal & Electrical Insulation Hard anodised surfaces naturally offer enhanced heat resistance and reduced electrical conductivity, making them suitable for high‑temperature and electrical applications.
- Long‑Term Performance Because the anodised layer becomes part of the aluminium itself, it will not peel, flake, or chip like traditional coatings.
⚙️ Typical Applications
Hard sulphuric anodising is commonly used in:
- Aerospace and defence components
- Automotive and motorsport parts
- Hydraulic and pneumatic systems
- Gears, pistons, cylinders, and sliding surfaces
- Precision engineering and tooling
- Marine and offshore equipment
These industries rely on hard anodising to improve reliability, reduce maintenance, and enhance overall component performance.
🧪 How the Hard Anodising Process Works
During the process, aluminium parts are submerged in a chilled sulphuric acid electrolyte and subjected to a carefully controlled electrical current. This grows a thick, uniform oxide layer that becomes fully integrated with the metal surface. The resulting finish ranges from dark grey to black depending on the alloy and can be sealed for additional corrosion resistance.
PPC Anodising also offer services, including Anodic Dying, Chromate Conversion, Chemical Brightening, Glass Bead Vapour Honing and PTFE.
