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Chrome Electroplating Services

Prototek's Advanced Finishing and Post-Processing Solutions

What is Chrome Plating?

A surface finishing technique, chrome plating, is where a thin layer of chromium is electroplated onto a metal or plastic object. It enhances the substrate’s appearance and surface hardness, helping your products withstand wear and corrosion, which builds trust in its durability.

Commercialization of chrome plating began in the 1920s. The first successful process was created at Columbia University in 1924. Afterward, it grew in popularity in industries such as automotive and aerospace, among many others.

Types of Chrome Electroplating

  • Decorative Chrome: Primarily found in aesthetic applications, it also offers corrosion resistance. It can improve nickel and sometimes copper. It is a thin chromium layer. Typically found in automotive trim, fixtures, and hardware.
  • Hard Chrome: Also called engineering chrome. This type is applied in much thicker layers for wear resistance and a reduction in friction. Common applications include hydraulic cylinders, piston rods, and industrial machinery.

The science behind chrome plating

  • Electroplating Principle: Chrome plating is performed by electroplating. The object, a cathode and a chromium source, the anode, are submerged in an electrolyte bath, generally chromic acid.
  • Faraday’s Law: This law states that the amount of chromium deposited is proportional to the electric current and plating time.
  • Bath Chemistry: The ratio of chromic acid to sulfuric acid is vital. It is commonly 100:1 for hard chrome and 200:1 for decorative chrome.

Common Chrome Plating Materials

  • Substrates: Aluminum, brass, copper, steel, and some plastics such as ABS.
  • Undercoats: Decorative chrome uses copper and nickel pre-chrome coatings to enhance corrosion resistance and appearance.
  • Electrolyte: Typically, chromic acid, or hexavalent chromium, with trivalent chromium baths, is a safer, eco-friendly alternative.

What is the step-by-step process for chrome plating?

  1. Surface Preparation
    • Cleaning and Degreasing: Remove all oils, greases, and contaminants using cleaning solutions and electrolytic cleaning.
    • Mechanical Polishing: It eliminates scratches and imperfections by smoothing the surface.
    • Acid Etching: Dipping the part in diluted acid, such as hydrochloric acid, to activate the surface for optimal adhesion.
  2. Undercoating (For Decorative Chrome Only)
    • Copper Strike: A thin copper layer increases conductivity and fills imperfections.
    • Nickel Plating: One or more nickel layers increase corrosion resistance and offer a smooth, reflective base.
  3. Electroplating Bath Setup
    • Bath Composition: Chromic acid and sulfuric acid are added in precise ratios. Trivalent chromium solutions offer a more eco-friendly process.
    • Bath Conditions: The current density and temperature are tightly controlled for optimal deposit quality.
  4. Chrome Plating (Electrodeposition)
  • The substrate is submerged in the bath and connected as the cathode.
  • A direct current is applied, which deposits chromium onto the surface of the substrate.
  • Duration, current, and bath chemistry will determine the thickness and properties of chrome layers.
  1. Post-Treatment
    • Polishing: For decorative applications, this post-processing treatment enhances the luster and finish.
    • Sealing: This is an optional protective topcoat that improves corrosion resistance.
  2. Quality Control
    • Post-plating inspections will check the uniformity, thickness, adhesion, and surface finish.
    • Use non-destructive testing and visual checks to ensure the highest standards.
  3. Safety and Environmental Considerations
    • Hexavalent Chromium Regulations: This type of plating is highly toxic and regulated by the EPA. Facilities using hexavalent chromium must use emission controls and comply with MACT standards.
    • Trivalent Chrome Alternatives: This is a safer, eco-friendly alternative that is increasingly adopted.
    • Waste Management: Proper treatment and disposal of the chemicals and rinse waters are mandatory to prevent environmental contamination.
Finishes - Chrome Plating Illustration

What are some applications for chrome plating?

Industry Applications The why?
Automotive
Bumpers, Wheels, Trims, Grilles, Exhausts, and Engine Parts
Aesthetics, Corrosion Resistance, Durability, and Easy Maintenance.
Aerospace
Landing Gear Hydraulic Cylinders, Turbine Blades, and Actuators.
Wear Resistance, Corrosion Resistance, Reliability, and Fatigue Resistance
Industrial and Manufacturing
Machine Parts, Molds, Tools, Rollers, Pumps, and Compressors
Added Hardness, Friction Reduction, Repair, Longevity, and Cost Savings
Consumer Goods
Faucets, Appliances, Watches, and Instruments.
Decorative Finishes, Durability, and Easy Cleaning
Medical Devices
Surgical Tools, Dental Instruments, and Implants
Sterility, Corrosion Resistance, and Biocompatibility
Defense
Aircraft Parts, Weapon Components, and Vehicle Parts
Hardness, Wear Resistance, Corrosion Resistance, and Reliability
Oil and Gas
Valves, Pumps, and Drill Components
Corrosion Resistance, Temperature Resistance, and Operational Reliability

What are some of the advantages of using chrome plating?

  • Corrosion Resistance: Chrome plating produces a robust barrier against rust and environmental exposure.
  • Wear Resistance and Hardness: The surface hardness is up to 1000 HV for abrasion and scratch resistance.
  • Low Friction Coefficient: Chrome plating will reduce the wear and tear between moving parts. It is ideal for hydraulic and mechanical assemblies.
  • Visual Appeal: A bright, mirror-like finish for a premium, high-quality appearance.
  • Longevity and Durability: Chrome plating can extend the lifespan of components.
  • Cost-Effective: It is more affordable than PVD for larger and more complex parts. It outperforms nickel and powder coatings when it comes to wear resistance.

Chrome Plating vs Alternative Coatings

Property Chrome Plating PVD Coating Nickel Plating Powder Coating
Corrosion Resistance
High
High
Moderate
Moderate
Wear Resistance
Excellent
Excellent
Good
Low
Hardness
800-1000 HV
1000+ HV
200-700 HV
N/A
Aesthetic Appeal
Mirror-Like
Good
Good
Variable
Cost-Effectiveness
High
Moderate
High
High
Environment Impact
Moderate/Low (Trivalent)
Low
Moderate
Low
Chrome Electroplating Services
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