This painless condition occurs when the little bumps on your tongue grow long and trap bacteria that live in your mouth -- making the tongue look black and hairy. Causes can include antibiotic use, poor oral hygiene, smoking, drinking a lot of tea or coffee, and not producing enough saliva.
Hello, Jie. The word passivate is a bit troublesome because aluminum cannot be passivated in the same sense as stainless steel; but it can be passivated in the same sense as zinc plating, i.e., with a chromate conversion coating.
Finishing Titanium. While titanium possesses all of these properties, as with other alloys, additional finishing is required to ensure that parts are clean and free of exogenous materials. Passivation is a chemical process that helps restore the contaminated material to original corrosion specifications.