[PDF] Top 20 The Study of a Phosphate Conversion Coating on Magnesium Alloy AZ91D: I. Formation, Morphology and Composition

... insoluble phosphate. Liu et al. [6] prepared a new molybdate-phosphate conversion coating on magnesium alloy ...molybdate-phosphate coating contained composite ... See full document

... The studied material was magnesium alloy AZ91D with the following chemical composition (wt %): Al, 9.4; Zn, 0.82; Mn, 0.23; Si, 0.01; Cu, 0.02; Ni, 0.0021; Fe, 0.005, and Mg. Samples were ... See full document

... of phosphate coatings with the addition of them into treatment bath immediately ...a phosphate coating on magnesium alloy AZ31 and reported that with SDS modification, a denser and less ... See full document

... The studied material was magnesium alloy AZ91D with the following chemical composition: Al, 9.400; Zn, 0.8200; Mn, 0.2300; Si, 0.0100; Cu, 0.0200; Ni 0.0021; Fe, 0.0050, and Mg, balance. ... See full document

... as phosphate, which have originally existed in the anodized layer, is considered to have an appropriate pH and work as a solution for conversion treatment to form another protective layer on the ...of ... See full document

... the formation of these numerous microscopic pores in the coating, and these pores then expanded as the coating thickness ...the phosphate solution. The coating morphology due to ... See full document

... chemical composition of the coatings were examined using a scanning electron microscopy (SEM, Quanta, FEI-450) equipped with Oxford X-ray energy dispersive spectrum ...chemical composition of the ... See full document

... the magnesium alloy AZ91D derived from various phosphating baths, each containing one of the following chelating agents in the basic phosphating bath: TSPP, ATMP, and ...the phosphate ... See full document

... the morphology and elemental maps of the phosphate conversion ...the coating thickness was about 10 μm. The compact coating with few thin cracks is ...matrix, coating and resin, ... See full document

... 6 phosphate car- boxyl groups, is extensively applied in the area of surface protection of metals due to its particular physical and chemical properties which has powerful capability of chelating with many metals ... See full document

... the coating formed in the phosphoric acid ...the coating formed in the sulfuric acid ...the magnesium alloys after phosphating [6, 10, 18-20] or acid pickling ... See full document

... nying this consumption increase, scrap from manufacturing and product replacement create a big amount of waste which needs recycled. In general, metallic scraps always can be re- melted to cast into ingot for subsequent ... See full document

... The study reported in [9] tested the solid car- bide end mills with and without TiN and TiAlN coating, which were engaged in machining SiC and B 4 C reinforced magnesium matrix workpiece material and ... See full document

... The electroless Ni-P plating processes are very complex due to their special selfcatalyzed chemical reactions. Most investigations have been done concerning influences of bath condition on composition, ... See full document

... was about 0.62 mass% near the chill block. Maximum concentration of Zn in the ‘‘with chill block’’ plate occurred at 100 mm distance from the riser. For the position toward riser, the Zn content finally went down to 0.48 ... See full document

... the coating due to hydrogen evolution and the existence of defects on ...Ni-P coating as cathode and Mg substrate as anode, the galvanic corrosion between Ni-P/Mg galvanic couple seems still to be a serious ... See full document

... the magnesium alloy, a bioactive hydroxyapatite (HA) coating was deposited on AZ60 magnesium alloy by a two-step chemical method, ...dicalcium phosphate dihydrate (DCPD) ... See full document

... ceramic coating F-B-A with excellent compactness was prepared on magnesium alloy AZ91D in acidic KF solution with dihydric phosphate by applying a bi- polar pulse ...dihydric ... See full document

... AZ31 magnesium alloy using DC and PC. Coating with direct current resulted in thin porous zinc layer with coarser ...smoother coating with fine grains and lower macro residual stress was ... See full document

... ceramic coating is formed on the surface of Mg alloy under anodic current via the reaction between substrate and electrolyte, the voltage increases rapidly to around 250V, the addition of Y 2 O 3 or Nd 2 O ... See full document