Nanocrystalline electrodeposits show tremendous improvements in many physical and mechanical properties compared to their conventional polycrystalline counterparts. Of particular concern for their applications as corrosion and wear resistant coatings is their intrinsic resistance to corrosive environments. This paper reviews recent advances in the understanding of the corrosion properties for several nanostructured pure metals (e.g., Ni and Co), alloys (e.g., Ni-P, Co-Ni-Fe) and composites (e.g., Ni-SiC). It will be shown that in many of these materials, grain size reduction to the nanometer range results in considerable improvement in their resistance to localized corrosion such as pitting, intergranular attack and intergranular stress corrosion cracking.
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