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.
