Nickel Aluminum Bronze Corrosion Resistance

What is corrosion?

Corrosion is the deterioration of metal as the result of chemical reactions and its surrounding environment. Corrosion can have a variety of negative effects on metal.  Ultimately corrosion of a metal component can lead to the failure of the component to function.  There are a number of different types of corrosion in metals.  They include:

• Galvanic corrosion
• Stress-corrosion cracking
• Erosion corrosion
• Cavitation corrosion
• Selective corrosion

Nickel Aluminum Bronze Alloys are known their superior corrosion resistance in seawater and many other chemical environments.  The corrosion resistant property relies on the formation of a copper/aluminum oxide film.  This film is self-repairing in media containing even low levels of oxygen.

This oxide film provides the following benefits:

• It adheres firmly to the surface of the substrate
• It has a resistance to liquid penetration
• The hardness of the alumina content creates higher resistance to erosion and abrasion

Nickel Aluminum Bronze alloys can be considered for service in the following chemicals.  Selection must take into account the operational temperature, concentrations, service conditions, and impurities.

Acetic Acid	Carbon Dioxide	Glycerine	Sewage
Acetic Anhydride	Carbonic Acid	Glycerol	Soaps
Acetate Solvents	Caustic Potash	Hydrochloric Acid	Sodium Bisulfate
Alcohols	Caustic Soda	Hydrofluoric Acid	Sodium Bisulfite
Aldehydes	Chlorine (dry)	Hydrogen	Sodium Chloride
Aluminum Chloride	Chloroform	Inert Gases	Sodium Hypochlorite
Aluminum Fluoride	Citric Acid	Lactic Acid	Sodium Nitrate
Aluminum Hydroxide	Coal Tar	Linseed Oil	Sodium Silicate
Aluminum Sulfate	Coal Tar Solvents	Magnesium Chloride	Sodium Sulfate
Ammonia (Dry)	Copper Sulfate	Mineral Oils	Sodium Bisulfite
Amyl Chloride	Dyestuffs, Acid Dyes	Naphthenic Acids	Sulphur
Asphalt	Esters	Nickel Sulfate	Sulfuric Acid
Barium Chloride	Ethers	Nitrogen	Sulfurous Acid
Benzole	Fats	Oxalic Acid	Sulfur Dioxide
Borax	Fatty Acids	Oxygen	Tannic Acid
Boric Acid	Fluosilicic Acid	Oleic Palmytic Stearic Acid	Tartaric Acid
Brine	Formaldehyde	Paints	Trichlorethylene
Bromine (Dry)	Formic Acid	Petroleum Products	Tri-Sodium Phosphate
Calcium Chloride	Furfural	Phosphoric Acid	Zinc Chloride
Calcium Hypochlorite	Fuel Gases	Pickling Solutions	Zinc Sulfate
Cane Sugar Liquors	Gelatine	Refrigeration Gases
Carbolic Acid	Glucose	Seawater

Applications that utilized Nickel Aluminum Bronze Corrosion Resistance

Paper Making

Nickel Aluminum Bronze is used in the paper making industry, where it comes into contact with low concentrations of hypochlorites and bisulfites found in the pulp.  It has excellent corrosion resistance under these conditions and is used for beater bars, valves and suction rolls. 

Glass Industry

Nickel Aluminum Bronze is used in the glass industry in the frosting of glass, utilizing its corrosion resistance in hydrofluoric acid.  In this industry hydrofluoric acid is sprayed through nickel aluminum bronze nozzles onto light bulbs.

Aerospace

Nickel Aluminum Bronze alloys C63000 AMS 4640, C95510 AMS 4880, C63020 AMS 4590, and C95520 AMS 4881 are used in landing gear bushings.  The excellent bearing properties combined with the corrosion resistance in salt conditions during deicing of run ways in the winter make these alloys ideal for this application

Nickel Aluminum Bronze Alloys

Here at National Bronze Mfg. Co., we offer the following Nickel Aluminum Bronze Alloys in both bar stock form and full machined components:

C63000 AMS 4640 Nickel Aluminum Bronze

C95510 AMS 4880 Nickel Aluminum Bronze

C63020 AMS 4590 Nickel Aluminum Bronze

C95520 AMS 4881 Nickel Aluminum Bronzes

C95500 9D Nickel Aluminum Bronze