Corrosion resistant applications

Lead for Corrosion Resistant Applications, Lead Industries Association Inc., New York... 

Niobium like tantalum relies for its corrosion resistance on a highly adherent passive oxide film it is however not as resistant as tantalum in the more aggressive media. In no case reported in the literature is niobium inert to corrosives that attack tantalum. Niobium has not therefore been used extensively for corrosion resistant applications and little information is available on its performance in service conditions. It is more susceptible than tantalum to embrittlement by hydrogen and to corrosion by many aqueous corrodants. Although it is possible to prevent hydrogen embrittlement of niobium under some conditions by contacting it with platinum the method does not seem to be broadly effective. Niobium is attacked at room temperature by hydrofluoric acid and at 100°C by concentrated hydrochloric, sulphuric and phosphoric acids. It is embrittled by sodium hydroxide presumably as the result of hydrogen absorption and it is not suited for use with sodium sulphide. 

Jones, R. D. and Jones, D. P., Hot-dip Aluminized Steel Strip for Corrosion Resistant Applications , in Surface Treatment for Corrosion and Wear Resistance, Strafford, Datta and Googen (eds), Ellis Horwood, Chichester (1984)... 

Chemical-resistant Highest chemical resistance of polyester group excellent acid resistance, fair in alkalies. Corrosion-resistant applications, such as pipe, tanks, ducts, fume stacks. 

CVD in Wear- and Corrosion-Resistant Applications 441 CVD Nitrides for Corrosion-Resistant Applications... 

Other CVD Corrosion-Resistance Applications. The following is a listing of typical applications where CVD is used either in production or experimentally for corrosion protection. 

Corrosion Resistance. Titanium is immune to corrosion in all naturally occurring environments. It does not corrode in air, even if polluted or moist with ocean spray. It does not corrode in soil and even the deep salt-mine-type environments where nudear waste might be buried. It does not corrode in any naturally occurring water and most industrial wastewater streams. For these reasons, titanium has been termed the metal for the earth, and 20—30% of consumption is used in corrosion-resistance applications (see Corrosion and corrosion inhibitors). 

Nickel plating is also extensively used for decorative and corrosion resistance applications. In most cases, it is electrolytically deposited. However, some applications can require high purity films or good conformal coverage that can be better performed by the CVD process. 

For detailed information about lead linings, their physical properties, and chemical resistance, the reader is referred to Lead for Corrosion Resistant Applications A Guide, published by the Lead Industries Association, Inc., New York, NY. 

Nickel containing scales exhibit higher conductivity because of the presence of trivalent nickel ions, which introduce vacancies in the lattice of the scale. Therefore, nickel-based coating can lead to superior conductivity and good protection provided that it is alloyed properly with corrosion resistant elements. Cobalt has a lower solubility in molten carbonate and electroless Co has been successfully used for a variety of corrosion-resistant applications. Electroless plating of Ni-Co gives rise to deposition of uniform layers of nanostructured material, which would result in better protection of the substrate. 

Kitchen utensils, knives, corrosion-resistant applications... 

Aluminum bronzes are alloyed principally with aluminum for useful strength and excellent corrosion resistance. Applications include valves, pumps and bushings. 

Seymour, R.B., Steiner, R.H., "Plastics for Corrosion Resistant Applications," Chapter 9, Reinhold Publishing Corp. New York, 1955. 

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