Abstract
An attempt was made to improve the corrosion resistance of amorphous nickel-based alloys by the addition of chromium, molybdenum or tungsten. The addition of these elements was more or less effective in decreasing the corrosion rate in 1 M HCl and 10% FeCl 3·6H 2O solutions at 30°C. In particular the addition of a certain amount of chromium is most effective and leads to spontaneous passivation in the HCl solution with immunity to pitting corrosion. The addition of molybdenum or tungsten lowers the corrosion rate. The amorphous NiP alloys with and without addition of molybdenum or tungsten are not passivated by anodic polarization even in sulfuric acid or phosphoric acid, forming thick porous surface films and suffer pitting corrosion in acidic chloride solutions.
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