EFFECT OF TEMPERATURE AND TRIETHANOLAMINE ADDITION ON THE KINETICS OFSEALING ANODIZED ALUMINUM

Electrochemical impedance spectroscopy (EIS) and standard sealing qual ity control tests were used to examine the accelerating effect on hydr ation reactions of the addition of 2 cm(3)/L TEA to the sealing bath. The presence of TEA was found to shorten the critical times required f or the acid dissolution test to be passed by a factor of 5 at boiling temperature and by almost 100 times at 50 degrees C. The effect of TEA was reflected similarly in the dye drop and acid dissolution tests, a nd somewhat less markedly in the admittance test.