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It is a material dependent and variable hardness technique suitable for the production of high quality coated metal optics. It is a group of coatings. The selection of type of electroless nickel should thus be made keeping in view its end applications. This coating is nanocrystalline with grain size of 10 -15 oA (1-1.5 nm) and the coating can be deposited with zero stress or slight compressive stress.
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