1050鋁合金在含鋁離子鹽酸溶液中的電解粗化行爲之研究

The Electrograining Behavior of 1050 Aluminum Alloys in Aluminum Chloride Added Hydrochloric Acid Solutions

謝曉華(S. H. Hsieh) ； 曾天佑(T. Y. Tseng)

《防蝕工程》 24卷4期 (2010/12) Pp. 255-263

https://doi.org/10.6376/JCCE.201012.0255

摘要

1050 aluminum alloys are generally used to fabricate pre-sensitized plates (PS plates) for printing. For practical applications, it is necessary to improve the adhesion of subsequent photosensitive coatings and to enhance the water retention properties of the alloy by increasing its total surface area. The fabrication process involves roughening or electrograining of the aluminum alloy in an acid solution via an AC power supply. The study focused on the electrograining behavior of 1050 aluminum alloy samples in aluminum chloride added hydrochloric acid solutions. The surface morphology of the sample was observed with scanning electron microscope, and the surface properties were analyzed to help understand the growth of grains and the effect of aluminum chloride addition. The results demonstrated that the addition of aluminum chloride greatly changed the electrograining behavior of the aluminum alloy. With aluminum chloride, the electrolysis at low current densities (＜14 A/dm^2) tended to result in an etched morphology instead of a grained one on the samples. Comparing with the samples electrograined in the solution without aluminum chloride, the samples processed at a higher current density (＞50 A/dm^2) exhibited less pits. Furthermore, chloride ion instead of aluminum ion was confirmed to contribute the difference during the early stage of graining. It was speculated that the passive film on the aluminum sample was more easily attacked by the solution with more chloride ions, and there were thus too many initial pits to develop a grained surface. At high current densities, the aluminum ions in the electrolyte seemed to form a thick film to deter pit initiation. Intermittent currents were applied to remove the thick film, and a normal electrograined surface was obtained.

關鍵字

電解粗化 ； 1050鋁合金 ； 預塗感光版

並列摘要

1050 aluminum alloys are generally used to fabricate pre-sensitized plates (PS plates) for printing. For practical applications, it is necessary to improve the adhesion of subsequent photosensitive coatings and to enhance the water retention properties of the alloy by increasing its total surface area. The fabrication process involves roughening or electrograining of the aluminum alloy in an acid solution via an AC power supply. The study focused on the electrograining behavior of 1050 aluminum alloy samples in aluminum chloride added hydrochloric acid solutions. The surface morphology of the sample was observed with scanning electron microscope, and the surface properties were analyzed to help understand the growth of grains and the effect of aluminum chloride addition. The results demonstrated that the addition of aluminum chloride greatly changed the electrograining behavior of the aluminum alloy. With aluminum chloride, the electrolysis at low current densities (＜14 A/dm^2) tended to result in an etched morphology instead of a grained one on the samples. Comparing with the samples electrograined in the solution without aluminum chloride, the samples processed at a higher current density (＞50 A/dm^2) exhibited less pits. Furthermore, chloride ion instead of aluminum ion was confirmed to contribute the difference during the early stage of graining. It was speculated that the passive film on the aluminum sample was more easily attacked by the solution with more chloride ions, and there were thus too many initial pits to develop a grained surface. At high current densities, the aluminum ions in the electrolyte seemed to form a thick film to deter pit initiation. Intermittent currents were applied to remove the thick film, and a normal electrograined surface was obtained.

並列關鍵字

Electrograining ； 1050 aluminum alloy ； Presensitized plate