Vol.5 No.3 (May 2015)
Study on Formation Mechanism of Black Stripe on the Surface of Aluminum Alloy Sheet and Its Prevention Measure
SEM and EDS were used to analyze the black stripe area, normal surface area and core layer of aluminum alloy sheet in this paper, and the Formation mechanism of black stripe on the surface of aluminum alloy has been ascertained from the analysis results. Aluminum powder had been ga-thered when it was not completely cleaned, then the agglomerated aluminum power had been pressed into the surface of aluminum, as a consequence, the surface of the sheet was destroyed; the micro crack formed in the rolling direction; organic carbon of emulsion would penetrate into the micro cracks and it was not easy to be washed; at last, it showed black stripe defect on the vision. Process parameters should be set reasonably in the manufacturing process and emulsion should be ensured effectively in order to reduce the discharge of aluminum powder and reduce the adverse influence on surface quality.
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