When the small-sized water-tube boilers are cleaned with general chemical cleaning methods,how to know the effect of corrosion inhibitors directly and how to ensure the passivation quality?the application of allochromatic corrosion inhibitors,the sophistication of chenmical scrubbing process and the optimization of neutralizer are tried out ,finally,the satisfactory results are acquired.

The influences of AlN passivation dielectric on the strain change of the AlGaN barrier layer and the high-temperature transport properties of AlGaN/GaN heterostructure have been investigated in the present work.