Corrosion resistance

Corrosion resistance of chrome layers

(National Research Council)

I – COMPLEX PRODUCTS AND MIXTURES
Material Reaction
Hot oxidising atmosphere Resistant
Hot reducing atmosphere Resistant 
Hot bakelite during moulding Resistant (does not matt)
Beet-sugar juice Resistant
Beer and must Resistant
Molten brass Resistant
Neutral brine Resistant
Molten aluminium bronze Resistant
Coal gas Resistant
Molten cyanides Resistant
Ebonite during melting Resistant
Fruit acids Generally Resistant 
Petrol (with or without tetraethyl lead, during combustion) Resistant
Hot products from the combustion of petrol and other fuels Resistant
Molten glass Resistant
Crude oils Resistant
Paper pulp Resistant
Synthetic resins Resistant
Thiourea resins (during moulding) Resistant
Vinylic resins (during moulding) Resistant
Rubber during vulcanisation Resistant
Sulphurous liquids Resistant to the boiling point
Tannin 1-3 Resistant
Molten zinc Attacked
Essential oils Resistant
Hot mineral oils Resistant
Printing inks Resistant
  
II- Chemical products
Material Reaction
Acids: 
Arsenic 1-2 Attacked moderately
Chloric 1-2 Attacked rapidly
Chlorinated acids Attacked
Chromic Attacked slowly
Hydrobromic 1-2 Attacked rapidly
Hydrofluoric Attacked
Sulphuric and nitric mixtures Resistant
Nitric 1-3 Attacked moderately
100% Nitric3 Attacked moderately
Perchloric 1-2 Attacked
Phosphoric 1-2 Attacked
85% Phosphoric Resistant
Bases: 
Ammonia Resistant
Sodium carbonate Resistant
Sodium hydroxide Resistant
Salts: 
Alum Resistant
Aluminium chloride 1-2 Attacked mildly
Aluminium sulphate 1-2 Attacked moderately
Ammonium chloride 1-2 Attacked moderately
Barium chloride 1-2 Resistant
Calcium chloride Attacked moderately
Calcium hypochlorite 1-2 Attacked
Chromium chloride 1-2 Attacked mildly
Copper chloride 1-2 Attacked rapidly
Copper nitrate 1-3 Attacked moderately
Copper sulfate Resistant
Magnesium chloride 1-2 Attacked moderately
Manganese chloride 1-2 Resistant
Potassium chloride 1-2 Resistant
Sodium chloride 1-2 Resistant
Sodium sulfate 1-2 Resistant
Zinc chloride Attacked mildly
Zinc chloride 1-2 Resistant
Gases (various): 
Ammonia Resistant; becomes brittle
Carbonic acid Resistant
Carbon dioxide Resistant
Dry chlorine Resistant up to 300 ºC
Wet chlorine Attacked
Hydrogen sulphide Resistant
Oxygen Oxidises above 1200 ºC 
Sulphur Resistant up to 300ºC
Aliphatic acids: 
Acetic 1-2 Attacked moderately
Butyric Attacked moderately
Citric 1-2 Resistant
Formic Attacked moderately
Gluconic 1-2 Resistant
Lactic 1-2 Attacked moderately
Lactic Resistant
Monochloroacetic 1-2 Resistant
100% Oleic Resistant
Oxalic 1-2 Resistant
100% Stearic Resistant
100% Stearic at 340 ºC Resistant
Tartaric 1-2 Attacked mildly
Trichloroacetic 1-2 Attacked mildly
Uric Resistant
Aromatic acids: 
Benzenesulphonic 1-2 Resistant
Benzoic 1-2 Resistant
3,5-Dinitrobenzoic Resistant
m-Nitrobenzoic 1-2 Resistant
Salicylic Resistant
Phenols: 
m-Aminophenol 1-2 Resistant
Chlorohydroquinone 1-2 Resistant
o-Chlorophenol 1-2 Resistant
p-Nitrophenol 1-2 Resistant
Phenol 1-2 Resistant
Picric acid 1-2 Resistant
Pyrogallol Resistant
Others: 
Benzyl chloride 3 Resistant
Carbon tetrachloride Attacked when wet
Chlorobenzene 3 Resistant
Chloroform Resistant
Sodium benzylsulphonate 1-3 Resistant
Sodium formate 1-3 Resistant
Sodium phenylsulphonate 1-3 Resistant
Tetrachlorobenzene 3 Resistant
 
1) As a 10% solution in distilled water.
2) At 58 ºC. Attack tends to be less pronounced at room temperature.
3) At 50 ºC. Attack tends to be less pronounced at room temperature.

 9001        9100        IAQG