Nickel can dissolve a large amount of alloying elements such as chromium, molybdenum and copper while maintaining a ductile gamma phase. Therefore, a wide range of nickel based alloys is available for application in highly aggressive environments. Some of these alloys are versatile and some others are specific and may be used only in certain environments. Laboratory corrosion testing results are presented to substantiate the applicability of the many types of nickel based alloys in several common service conditions, especially in aggressive alkaline and acidic environments. Keywords: nickel alloys, alloying elements, temperature, caustic, hydrochloric acid, sulfuric acid, ferric ions, chloride ions.