Physical and Chemical Properties of Chromium

Following are the physical and chemical properties of chromium. Contact us for more information or to request a quote.

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A. Corrosion Resistance

Electroplated chromium has excellent resistance to a variety of corrosive environments. The following table will provide a broad, general guide to its compatibility with some corrosive materials. So many factors are involved in corrosion, such as the presence of suspended materials in the corrodent, the velocity of the corrodent or simply the quality of the plate that this table is a general guide only. Prudence with suggest that tests be conducted under actual service conditions prior to making design decisions. For assistance or for information on corrodents not listed, please consult the U.S Chrome Laboratory.

R – usually completely resistant
SA – some or slight attack, should be tested
NR – not recommended

Unless otherwise noted, inorganic materials were tested in 10% aqueous solutions at 25°C (77°F).

CORRODENT RESISTANCE       CORRODENT  RESISTANCE
Acetic Acid, glacial  R    Milk  R
Acetic Acid, 50% Aq  R    Monochloracetic Acid  R
Air, hot oxidizing  R    Nitric Acid  R
Air, hot reducing  R    Oil, crude  R
Aluminum Chloride, 50% Aq  NR    Olecic Acid  R
Aluminum Sulfate (Alum) 25% Aq  SA    Palmitic Acid  R
Ammonia, Aqua  R    Paper Pulp, sulfite  R
Ammonium Chloride, Aq  SA    Phenol  R
Aniline Hydrochloride  SA    Phytalic Acid  SA
Barium Chloride, Aq  R    Phosphoric Acid, 85%  SA
Beer  R    Picric Acid, Aq  R
Bezoic Acid  R    Plastics, vinyl  R
Biscuit & Bread Dough  R    Plastics, melamine or urea formaldehyde  R
Butyric Acid  SA    Plastics, polyethylene or polypropylene  R
Calcium Chloride, Aq  SA    Plastics, acetal  SA
Calcium Hypochlorite, Aq  NR    Potassium Chloride, Aq  R
Carbon Dioxide  R    Propionic Acid  SA
Carbon Disulfide  R    Rubber, mixing or vulcanizing natural  R
Chlorine, moist gas  NR    Soap  R
Chromic Acid, Aq  SA    Sodium Chloride, Aq  R
Chromic Chloride, Aq  SA    Sodium Carbonate, Aq  R
Citirc Acid, Aq  SA    Sodium Hydroxide, Aq  R
Cupric Chloride, Aq  NR    Sodium Hypochlorite, Aq  NR
Cupric Nitrate, Aq  SA    Steam, saturated  R
Cupric Sulfate, Aq  R    Stearic Acid  R
Dichloroacetic Acid  NR    Succinic Acid  SA
Ethylene, Gaseous  R    Sulfanilic Acid  SA
Ferric Chloride, Aq  SA    Sulfur, molten  R
Ferrous Sulfate, Aq  SA    Sulfer Dioxide, moist  R
Fruit Juices, acid  R    Sulfuric Acid, 96%  NR
Glass, molten  R    Tar, molten  R
Glue, hoof, hot  R    Trichloracetic Acid  NR
Hydrochloric Acid, Aq  NR    Trichloroethylene  R
Hydrofluoric Acid, Aq  NR    Whiskey & Wine  R
Iodine, solid & vapor  NR    Zinc, molten  SA
Ink, printing  R    Zink Chloride, Aq  NR
Lactic Acid  SA      


B. Hardness

Indentation Hardness (Kg / mm²)

Aluminum, Type 1100 H18 70
Zinc 100
Steel, mild cold rolled 150
Brass, 70-30 hard 165
Stainless Steel, Type 304 165
Nickel, bright electroplated 300
Stainless Steel, Type 410 hardened 375
Steel, hardened tool steel 450
Chromium electroplated 1200 (Rc70)

USChrome-chromium-hardness.png


C. Coefficient of sliding Friction

Hard Steel on Hard Steel - dry  0.42
  -oiled  0.03
Chromium on Hard Steel -dry  0.15
  -oiled  0.03
Mild Steel on Mild Steel -dry  0.57
  -oiled  0.09
Nickel on Mild Steel -dry  0.64
  -oiled  0.18
Chromium on Mild Steel -dry  0.16
  -oiled  0.05
Hard Steel on Babbitt -dry  0.33
  -oiled  0.16
Mild Steel on Cast Iron -dry  0.23
  -oiled  0.13
Chromium on Cast Iron -dry  0.15
  -oiled  0.03
Aluminum on Aluminum -dry  1.4
  -oiled  not available
Mild Steel on Aluminum -dry  0.47
  -oiled  not available


D. Coefficent of Linear Expansion

8.1 X 10—6 cm/cm/°C
4.5 X 10—6 in/in/°F

COMPARISON WITH OTHER MATERIALS

Material cm/cm/°C at 20°C in/in/°F at 68°F
Aluminum (99.9+) 22.5 X 10—6 12.5 X 10—6
Brass (70Cu-30zn) 19.8 X 10—6 11 X 10—6
Cast Iron (Gray) 10.44 X 10—6 5.8 X 10—6
Chromium 8.1 X 10—6 4.5 X 10—6
Monel (70Ni-30Cu) 14.4 X 10—6 8 X 10—6
Steel (1040) 11.34 X 10—6 6.3 X 10—6
Steel (18Cr-8Ni Stainless) 9.0 X 10—6 5 X 10—6
Titanium (99.0%) 8.55 X 10—6 4.75 X 10—6

 

VARIATION WITH TEMPERATURE

Temperature Range, C Coefficient of Linear Expansion cm/cm/°C
20-400 8.4 X 10—6
20-600 9.2 X 10—6
20-800 9.8 X 10—6
20-1050 11.0 X 10—6
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