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.
Passivation Surface Finishing, Passivation Of Stainless Steel, Aluminium, Titanium, Zinc, Brass, Anodizing Chemicals, Pickling Of Metal Alloys, India. STAINLESS STEEL PASSIVATION.