EFFECT OF OXYGEN-CONTENT ON THE CORROSION OF ALN POWDER IN DILUTED ACID-SOLUTION

Corrosion exposures al room temperature in different diluted acid medi a (0.025N and 0.05N HCl) were performed on two aluminum nitride powder s with different oxygen contents: 0.6 wt% and 1 wt%. The process was m onitored, measuring the amount of Al3+ leached and the solution pH. Th e results show that the corrosion kinetics are dependent on the acid c oncentration, and that the amount of oxygen present in the powder in s olid solution is the factor that controls the length of the low rate a ttack step of the corrosion process.