分类: 信息化
2014-05-23 19:00:29
() Initial exchange electrolysis, a thin surface layer of a barrier layer (thickness of about 1 ~ 10nm), then as the etching action of the electrolyte, the barrier layer is particularly thin portion is broken first (e.g., pits, inclusions and other defects in the metal compound Office), the current generated at the large amount of hydrogen concentration, the formation of a longitudinal grain starting "bar" part of the article, the bubbles rise along the trajectory of the accelerated rate of dissolution of the film and the substrate. When the top of the wood () development has not encountered other wood raw (various defects) or because the top of the dense oxide film and good adhesion with the substrate, hydrogen bubbles floating, escape is not enough to tear it part of the oxide film, then the termination of the wood grain grooves, begins again at the appropriate position. After a certain time electrolysis, aluminum resembles the surface of the wood grain stripes (), presented after coloring wood grain pattern.