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Corrosion Resistance of Industrial Hard Chrome Plating

Corrosion Resistance

Chromium is a hard, brittle, tensile-stressed metal that has good corrosion resistance to most materials. As it builds in thickness it develops a pattern of tiny cracks because the stresses become greater than the strength of the coating. These cracks form a pattern which Interlaces and sometimes extends to the base metal. A corrosive liquid or gas could penetrate to the base metal. This can be prevented in three ways. A nickel undercoat can be applied to provide a corrosion resisting barrier; the chrome plating can be applied to maximum thickness; or a thin, dense chrome can be substituted.

The following table is a general indication of the resistance to chromium to various corrosive agents. The corrosive resistance of chromium in actual use is affected by operating factors, such as temperature. concentration, areation and the-presence of small amounts of other constituents in the corrosive medium so that the data in this table must be considered only as an approximation. For critical conditions it may be preferable to conduct tests in the actual solution in use and under the actual operating conditions.

Corrosion Resistance of Hard Chrome
  • "C" indicates behavior at approximately 55° F.
  • ''H" Indicates behavior at approximately 135 °F.
  • Except where otherwise noted results are given tor 10% solutions of the chemical in water.
Chemical Excellent Moderate Poor
Acid Acetic C H  
Acid Benzoic Sat. CH    
Acid Butyric CH    
Acid Chromic   CH  
Acid Citric C H  
Acid Hydrobromic C   H
Acid Hydrochloric     CH
Acid Hydrofluoric     CH
Acid Hydroiodic C H  
Acid Lactic C H  
Acid Nitric C H  
Acid Nitric 100% CH    
Acid Oleic 100 % CH    
Acid Oxalic CH    
Acid Palmitic 100% CH    
Acid Phosphoric c.p. C   H
Acid Phosphoric c.p. C H  
85% Acid Phosphoric crude   C H
Acid Picric CH    
Acid Salicylic sat. CH    
Acid Stearic 100% CH    
Acid Sulfuric   C H
Acid Sulfuric 100%     CH
Acid Tartaric C H  
Aluminum Chloride C H  
Aluminum Sulfate C H  
Ammonia CH    
Ammonium Chloride C H  
Atmosphere CH    
Barium Chloride CH    
Beer CH    
Benzyl Chloride Sat. CH    
Benzyl Chloride 100% CH    
Brass, molten H    
Calcium Chloride CH    
Carbon Dioxide CH    
Carbon Disulfide Sat. CH    
Carbon Tetrachloride Sat. CH    
Carbon Tetrachloride 100% CH    
Chloride of Lime   C H
Chlorine, dry C    
Chloride, moist     C
Chlorobenzene sat. & 100% CH    
Chloroform sat. & 100% CH    
Copper Chloride   C H
Copper Sulfate CH    
Ferric Chloride C H  
Ferrous Chloride C H  
Glue CH    
Hydrogen Sulfide 100% CH    
Magnesium Chloride CH    
Mercuric Chloride     CH
Petroleum crude CH    
Phenol CH    
Printing Ink C    
Sodium Carbonate CH    
Sodium Chloride CH    
Sodium Hydroxide CH    
Sodium Sulfate C H  
Stannous Chloride C   H
Sulfur 100% CH    
Sulfur Dioxide 100% CH    
Sugar CH    
Tin, molten 100% H    
Zinc, molten 100% H    
Zinc Chloride C H  
Zinc Sulfate C H  

 


4 Chrome Plating Processes by Electro-Coatings

Click to view our Chrome Comparison table and
learn more about our 
4 Chrome Plating Processes.


Properties and Benefits of Industrial Hard Chrome Plating

  • Wear & abrasion resistance
  • Lubricity
  • Hard­ness
  • Durability
  • Adhesion & bonding
  • Low coefficient of friction in metal parts
  • Prevents seizing & galling 
  • Restores the dimensions of undersized parts
  • Extends equipment in-service life, reducing costly downtime

The data and Information presented are based on our experience to date. The material is intended as a guide for use at your discretion. ACME Holdings or its operating divisions assume no liability in connection with this material.