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Special coatings, electroplating, finishing, and heat treatment processes used in aero engine manufacturing.

Special coating, electroplating, finishing, and heat treatment processes used in aero engine manufacturing.

Electroplating Processes

Process

Chemical Bath

Applications

Benefits

Nickel Plating

Nickel sulfamate

Blisk blade tips, pre-brazing preparation for turbine blades, frames, and vanes

Wear resistance, thermal barrier properties

Cobalt Plating

Cobalt sulfate

Repairing combustor casings and turbine components

Wear resistance, high-stress applications

Zinc-Nickel Plating

Zinc-nickel alloy

Corrosion protection for aluminum, titanium, and magnesium parts

Sacrificial corrosion protection

Copper Plating

Copper ions

Smoothing surface imperfections, undercoat for other metals

Conductivity, surface preparation

Hard Chrome Plating

Chromium ions

Thermal barrier coatings for combustion chambers, landing gear, shafts, hydraulic components

Hardness, thermal resistance, wear resistance

Silver Plating

Silver ions

Fasteners, bearings, electrical contacts

Reduces fretting and galling in high-temperature environments

Gold Plating

Gold ions

Electrical connectors and sensors in engine control systems

Conductivity, corrosion resistance

Cadmium Plating

Cadmium solution

Fasteners, landing gear (restricted due to environmental concerns)

Corrosion resistance, prevents galling

Special Coating Processes

Process

Purpose

Key Features & Applications

Thermal Barrier Coatings (TBC)

Protects against high temperatures

Ceramic-based coatings (Yttria-Stabilized Zirconia) applied on turbine blades & vanes

Plasma Spray Coating

Enhances wear, oxidation, and heat resistance

Uses high-energy plasma to spray molten material onto surfaces

High-Velocity Oxy-Fuel (HVOF) Coating

Improves erosion and corrosion resistance

Used on shafts, bearings, and high-stress components

Chemical Vapor Deposition (CVD)

Provides corrosion and wear resistance

Used for applying coatings like TiC, TiN on turbine blades

Physical Vapor Deposition (PVD)

Improves thermal and oxidation resistance

Used for thin-film coatings on compressor blades

Electroless Nickel Plating

Increases corrosion resistance and hardness

Uniform coating on complex shapes like fuel system components

Diffusion Coatings (Aluminizing)

Protects against oxidation and corrosion

Forms an aluminum-rich surface layer on turbine blades

Finishing Processes

Process

Purpose

Key Features & Applications

Superfinishing

Reduces friction and enhances fatigue life

Used for bearings, shafts, and compressor parts

Shot Peening

Improves fatigue strength and stress resistance

Involves blasting surfaces with small steel/ceramic beads

Honing

Enhances surface finish and dimensional accuracy

Used for cylinder bores, valve seats, and bearing housings

Polishing

Reduces surface roughness for better aerodynamics

Applied on fan blades and high-speed rotating parts

Chemical Milling

Removes material selectively for weight reduction

Used in thin-walled aerospace structures

Electrochemical Machining (ECM)

Improves precision for complex parts

Non-contact machining for turbine airfoils and cooling holes

Heat Treatment Processes

Process

Purpose

Key Features & Applications

Solution Heat Treatment

Improves strength and corrosion resistance

Used for aluminum, titanium, and nickel-based superalloys

Precipitation Hardening (Aging)

Enhances mechanical properties

Strengthens alloys used in turbine discs and blades

Case Hardening (Carburizing/Nitriding)

Increases surface hardness while maintaining toughness

Used for gears, shafts, and high-stress components

Annealing

Reduces internal stresses and improves machinability

Applied to aluminum and titanium alloys before machining

Stress Relieving

Minimizes residual stresses from welding or machining

Used on large structural components like casings

Vacuum Heat Treatment

Prevents oxidation and contamination during heat treatment

Used for critical aerospace components requiring clean surfaces

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