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电子工业中常用高钝铝作散热部件,这些部件必须均匀地消除其光泽,而形成对光线呈漫反射的银白色光面。 高钝铝与酸的反应较缓慢,必须加入与铝离子能络合的络合剂以加快铝与酸的反应。铝离子电子层结构是1S~2,2S~2,2P~6。在第三层外层轨道上有空轨,而(F~(-))有弧电子对,能作为一个配位基填入铝离子的空轨中而形成络离子AlF_6~(3-)。当然,因为氢氟酸的离解常数PK=3.18,pH低时会降低氟离子活度,这种反应不能在强酸下进行。 加入一些氧化剂如双氧水、过硫酸铵等氧化剂能促使铝的溶解反应,加快侵蚀作用。 我们认为采用这种溶液作“砂面腐蚀”较稳定。
Commonly used in the electronics industry, high-pass aluminum for cooling components, these components must be evenly eliminated its luster, and the formation of diffuse reflection of light white silver. High passive aluminum and acid reaction more slowly, you must add complexing agent with aluminum ions to speed up the reaction of aluminum and acid. Aluminum ion electronic layer structure is 1S ~ 2, 2S ~ 2,2P ~ 6. There are empty orbitals in the third outer layer orbitals, and (F ~ (-)) have arc-electron pairs that can act as a ligand to fill in the empty orbit of aluminum ions to form the complex ion AlF_6 ~ (3-). Of course, since the dissociation constant of hydrofluoric acid, PK = 3.18, low fluoride activity at low pH, this reaction can not be performed under strong acid. Add some oxidants such as hydrogen peroxide, ammonium persulfate and other oxidants can promote the dissolution of aluminum reaction to speed up the erosion. We think that the use of this solution as a “sand surface corrosion” is more stable.