Novel composite coatings were fabricated on 6061 aluminum alloy substrates by two steps combining micro-arc oxidation (MAO) plus electroless copper plating (Cu). Different MAO + Cu compared. continuously and evenly covered an oxide surface during processing thus changing the topography. The adhesion of coating was tested pull-out method. best strength can reach industrial requirements. effects ...

a micro-channel heat exchanger reactor with different micro-baffle shapes has been studied numerically. governing equations were solved base on the finite volume method with fluent software. in upper section, oxidation reaction of methanol was occurred and in lower section, steam reforming of methanol was done. two sections were separated with solid part which played as heat exchanger and trans...

Abstracts Micro-arc oxidation (MAO) coatings were prepared on the AZ31 Mg alloy under constant/gradient current control modes. The effects of output modes growth rate, energy consumption, microstructure, and corrosion resistance MAO studied. results shows that step-down mode (G852) exhibited a lower unit consumption than constant (C5) step-up (G258), even though same average density was used du...

Constraint satisfaction research has focussed on consistency checking using k-consistency and its variations such as arc-consistency, and path-consistency. We define a new form of consistency checking that is based on coloring the micro-structure graph of a constraint satisfaction problem (CSP). In our formulation, if the micro-structure graph of a CSP with n variables can be colored with n − 1...

In order to improve the high-temperature oxidation resistance of refractory high-entropy alloys (RHEAs), we used micro-arc (MAO) technology prepare ceramic coatings on AlTiCrVZr alloy, and effects voltage microstructure were studied. this paper, MAO was adjusted 360 V, 390 420 450 V. The microstructure, elements distribution, chemical composition, surface roughness studied by scanning electron ...

Aluminum Silicon (Al-Si) alloys are the most important among cast and have widespread application. The β-Si phase is detrimental to growth of micro arc oxidation (MAO) layers on Al-Si alloys. In this paper, in skin layer different was removed by an acid etching pretreatment. Then, impacts condition their MAO process were investigated. Results show that, as time prolonged, Si content surface Al-...