Development of Novel Corrosion Techniques for a Green Environment

Table 1

Comparison of conventional and nano coatings.

Properties	Conventional alumina/titania	Nanostructured alumina/titania	Improvement
Toughness	Poor	Excellent	Dramatic
Hardness (VHN)	1,000	1,000	—
Wear resistance (N∗m/mm^3)	7.5×10^3	40×10^3	~5X
Corrosion resistance	Good	Exceptional	Significant
Grindability	Poor	Excellent	Dramatic
Fatigue life	<1 million cycles	>10 million cycles	>10X
Flex tolerance	Result in coating spallation	Can be bent over 180 degrees with out spallation	Dramatic
Bond strength (psi)	1,900	~8000	~4X