The surface roughness was measured with double-barreled microscope based on the principle of light cut.
Maximum height of the profile was defined as Rz , referring to the sum of maximum profile peak height and
maximum valley depth contour
Hydrofluoric acid, 3ml Hydrochloric acid, 5ml Nitric acid and 190ml distilled water, the time of corrosion was
about 20 seconds. After the corrosion, the samples were washed with water, and then dried with a hair dryer before
observing the microstructure in XJP-6A microscope
The surface roughness was measured with double-barreled microscope based on the principle of light cut.Maximum height of the profile was defined as Rz , referring to the sum of maximum profile peak height andmaximum valley depth contourHydrofluoric acid, 3ml Hydrochloric acid, 5ml Nitric acid and 190ml distilled water, the time of corrosion wasabout 20 seconds. After the corrosion, the samples were washed with water, and then dried with a hair dryer beforeobserving the microstructure in XJP-6A microscope
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