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Alloys cathodically modified with noble metals

  • Reviews of Applied Electrochemistry 28
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Abstract

The truly remarkable corrosion resistance of alloys containing small amounts of noble metals relies on the principle that the high exchange-current density for the reduction of hydrogen can shift the corrosion potential of the alloy to a value in the passive region, causing it to passivate spontaneously. Research indicates that additions of 0.1 to 0.4% PGMs to chromium in sulphuric acid cause the alloy to self-passivate easily and also increased the corrosion resistance by several orders of magnitude. The effectiveness of the PGMs in promoting corrosion resistance was found to decrease in the order Pt>Pd>Ir>Ru>Os. An enrichment of PGMs at the surface of the alloys occurred during the period of active dissolution. The effect of cathodic additions in ferritic stainless steels became more enhanced with an increase in the chromium content of an alloy. Furthermore, if molybdenum and a PGM occur together in an alloy, a synergistic beneficial effect is exerted on the corrosion resistance. The effect of the cathodic modification of austenitic stainless steels is not as dramatic as for ferritic stainless steels. Little is known about the effect of PGMs on the corrosion behaviour of duplex stainless steels. Work on titanium-palladium alloys led to the development of a commercial titanium-palladium alloy containing 0.2% palladium, which is especially suited to reducing conditions. By contrast with the chromium and stainless-stell alloys, the addition of PGMs to titanium was found not to be detrimental to its corrosion resistance in highly oxidizing media. The surface alloying of materials with PGMs by various methods could prove to be a more cost-effective method than bulk alloying.

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    J. H. Potgieter

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Potgieter, J.H. Alloys cathodically modified with noble metals. J Appl Electrochem 21, 471–482 (1991). https://doi.org/10.1007/BF01018598

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  • DOI: https://doi.org/10.1007/BF01018598

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