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Chromium plating: Advantages, Applications and processes

Chromium plating is the process of covering or coating an object with a layer of chromium for aesthetic and/or protective purposes.

Since chromium is a naturally occurring metallic element, chromium plating of objects increases their wear/strength and improves corrosion resistance; It can also change the appearance of an object, giving it a metallic and often highly polished appearance.

Chromium plating

Types of chromium plating

There are two main types of chrome plating – hard chrome and decorative chrome.

If you primarily want to extend the life of an object, you will choose hard (or engineered) chrome plating. Decorative chrome plating adds a thin layer of chromium for aesthetic purposes.

Chromium plating of complex parts should be pictographic anode cylindrical parts should be cathodic protection at both ends to avoid the phenomenon of burning and thin coating in the middle of the parts with edges and corners, tip can be shielded by metal wire.

Chromium plating2


  • Chrome plating, whether hard or decorative, is performed using electroplating techniques.
  • Electroplating is a process that uses an electric charge to drive dissolved chromium from a solution to an object immersed in the solution.
  • Before plating, however, you must clean and degrease the workpiece to ensure an even coating. Next, you completely submerge the workpiece into a bath containing dissolved chromic anhydride before applying the charge.
  • With hard chrome plating, you need to plating the workpiece long enough to form a relatively thick chromium layer. This thickness depends on the product specification and ranges from 0.02 mm to 0.13 mm.
  • For aesthetic purposes, decorative chrome plating often requires additional steps to obtain the best final finish; You’ll start by plating a thin layer of nickel, copper, or sometimes both to provide a smooth, shiny surface finish.
  • After this, you will electroplate a thin layer of chromium on top to prevent scratching or tarnishing. The final thickness OF the decorative CHROME coating is much thinner than that of the decorative chrome plating, ranging from 0.005 mm to 0.015 mm.
  • After chrome plating, you can polish or polish the workpiece to the desired finish.


  • Because of its attractive mirror finish, the automotive industry relies heavily on decorative chrome plating in the production of parts. It offers items such as rims, bumpers and exhausts – the visible decorative parts of cars and motorcycles – with highly polished metal surfaces and corrosion resistance.
  • Other common applications of this type include kitchen appliances, faucets, and tools.
  • Hard chrome plating is also used in the automotive industry, but for different purposes. Thicker coatings provide items such as shock absorbers and engine cylinders to increase wear resistance and hardness.
  • Other applications of this coating include gears, piston heads, and some aerospace applications.


  • 1, iron chromium plating process
  • Wax removal → hot dip oil removal → cathode → anode → electric oil removal → weak acid etching → preplating alkali copper → acid bright copper selection → bright nickel → chromium plating or other
  • Wax removal → hot dip oil removal → cathode → anode → electric oil removal → weak acid etching → semi-bright nickel → high sulfur nickel → bright nickel → nickel sealing selection → chromium plating
  • 2, zinc alloy chromium plating process
  • Wax removal → hot dip oil removal → cathode electric oil removal → acid leaching → basic bright copper → copper pyrophosphate selectivity → acid bright copper selectivity → bright nickel → chromium plating
  • 3, stainless steel direct chrome plating process
  • 1) Electrochemical oil removal → hot water washing → cold water washing → acid leaching activation 1ml/LHCL, 10ml/L H2SO4 room temperature for half a minute is suitable for automatic line stainless steel chromium plating should not be copper or nickel plating → water → chromium plating.
  • 2) Cathodic electrochemical deoiling → cleaning → anode activation 10A/dm2→ direct plating Chrome.
  • 3) Chemical deoiling → cleaning → anodic electrochemical deoiling 0.5A/ DM 2 → cleaning → dipping Acid activation 1ml/L HCL, 10ml/L H2SO4 at room temperature 45S→ cleaning → plating
Chromium plating1