Industries / Shipbuilding
Shipbuilding
Engineered surfaces. Reliable at sea.
Protection of critical marine components against seawater corrosion, cavitation, erosion and wear. Coating selection considers the service environment, loads and maintenance requirements.
Components and protection zones
Propeller blades
Cavitation and erosion protection of working surfaces.
- Zones:
- Suction and pressure sides, leading edges and hub transitions.
- Coatings / bond coat:
- Al2O3, ZrO2; WC-CoCr; NiCrAlY
- Substrate:
- Copper-nickel and nickel-aluminium bronze.
Pump shafts and sleeves
Wear and corrosion protection in seawater pumps and dynamic seals.
- Zones:
- Shaft journals, sleeve fits and seal contact zones.
- Coatings / bond coat:
- WC-CoCr, Cr3C2-NiCr, NiCrBSi; DLC
- Substrate:
- Stainless steels including 13Cr and 17-4PH.
Rudder stock and stern tube
Corrosion protection and reduced friction at bearings and seals.
- Zones:
- Bearing surfaces, tube bore and seal interfaces.
- Coatings / bond coat:
- NiCrAlY, NiAl, WC-CoCr; PTFE
- Substrate:
- Stainless steel.
Seawater pump impellers
Protection against cavitation and erosion by seawater flow.
- Zones:
- Blade surfaces, leading edges, hub and disc.
- Coatings / bond coat:
- Al2O3, ZrO2, Cr3C2-NiCr
- Substrate:
- Duplex stainless steels and nickel-aluminium bronze.
Valve bodies and seats
Corrosion and wear protection while maintaining sealing integrity.
- Zones:
- Flow passages, seats, stems and plug surfaces.
- Coatings / bond coat:
- Co-Cr, NiCrAlY, WC-CoCr, Cr3C2-NiCr
- Substrate:
- Carbon and stainless steels.
Deck winches and thrusters
Protection of loaded mooring mechanisms and propulsion surfaces.
- Zones:
- Drums, shafts, rollers and pins; thruster blades, hubs and housings.
- Coatings / bond coat:
- Engineered system selected for the service environment
- Substrate:
- Structural steels and marine alloys.
Materials and applications
| System | Materials | Application |
|---|---|---|
| Corrosion-resistant metallic | Al, Zn, NiCrAlY, NiAl; stainless steel | Housings, flow passages, pipelines and structural components. |
| Wear-resistant carbide | WC-CoCr, Cr3C2-NiCr, WC-Co, NiCrBSi | Shafts, sleeves, valves, rollers, pins and seal components. |
| Cavitation-resistant ceramic and composite | Al2O3, ZrO2, TiO2 | Propeller blades, pump impellers and cavitation-loaded surfaces. |
| Protective and low-friction | PTFE; Epoxy / polyurethane / sealers | Housings, mating surfaces and interfaces requiring additional protection. |
Coating structure
- Functional layer
- Bond coat, if required
- Component material
Schematic, not to scale. Layer count and bonding mechanism depend on the selected material and process.
Coating processes
- HVOF / HVAF
- APS
- VPS
- Cold spray (CS)
- Wire arc spray
Typical applications, not a component specification. Composition, thickness, surface preparation and acceptance criteria must be selected for the operating conditions and validated by testing.