Showing 3 results for Anodizing
Mr Mohammadtaher Safarzadeh, Mr Seyed Mohammad Ali Boutorabi, Mr Asghar Arab,
Volume 7, Issue 3 (8-2010)
Abstract
The effects of anodizing condition and post treatment on the growth of nickel nanowires, were investigated. A two-step anodizing process was applied in phosphoric and oxalic acid solution. Nickel electrochemical plating was applied to fill Anodic Aluminum Oxide (AAO) pores. For pore filling enhancement, AAO surfaces were treated by silver predeposition. After electroplating, aluminum and oxide layer of some specimens were removed. The results showed that silver preplating increases the pore filling and as the applied voltage becomes higher, the pores diameter decreases.
Sh. Damghanian, H. Omidvar, S. H. Tabaian, A. R. Azadmehr,
Volume 11, Issue 2 (6-2014)
Abstract
The conical nanostructure improves the applications of alumina membranes and provides three dimensional
nanometer scale systems to study the chemical and physical properties. In this study, the nano cone structure is
produced in porous anodic alumina (PAA) by two-step anodizing. This conical nanostructure will improve the
application of PAA membranes. This approach is novel generation of the so-called "gradually decreased voltage"
technique, in which the voltage- time curve is divided into three stages and the effect of each step is investigated for
different electrolytes. The effect of the decreasing voltage is examined in two types of electrolytes oxalic and
phosphoric acid with a constant decrease in voltage rate. The results of SEM, FE-SEM images show the slope of the
inner cone layer in the oxalic acid to be considerably larger compared with phosphoric acid.
Seyed Reza Elmi Hosseini, Fatemeh Azarnia, Hassan Saghafiana, Javad Behzadifara,
Volume 21, Issue 0 (3-2024)
Abstract
In this study, the feasibility of laser welding on anodized aluminum alloy has been investigated. There are many demands in the industry for the welding of anodized aluminium sheets. Firstly, the anodizing process was performed by changing the anodizing time and keeping the other anodizing parameters constant. The anodizing process was performed at three different anodizing times of 30, 45, and 60 minutes. Then, the sample with the largest oxide layer thickness, which was obtained at the higher anodizing time, was chosen for the laser welding. The welding process was performed at a laser power of 1500 watts and a welding speed of 300 mm/s on an anodized 6061-T6 aluminum alloy with an oxide layer thickness of 17 microns. The current investigation depicted that the sound joint occurred between two anodized aluminium sheets. Although the anodized layer acts as an inhibitor for the joining of aluminum sheets due to its high melting point, the results showed a homogeneous distribution of the elements within the weld zone. In the meantime, the growth of dendrites across the weldment shows the concentration of elements in the interdendritic regions of the weldment.
