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.
In consequence, aluminum can be found in steel as metallicaluminum and (so-called soluble aluminum), aluminum oxide and aluminumnitride. Metallic aluminum and aluminum nitride can be dissolved in acid and sothis part is called acid soluble aluminum or simply soluble aluminum.During thesteel production process, it is important to have a measure of the level of thesoluble aluminum in steel. Soluble and insoluble compounds in metals with spectrolab 167Fig. 7 â Evolution of the aluminum signal from the start of the analysis. Following this discovery, the peak integration method (PIM) was introducedat SIDEX in 2000.