Electroless Ni–P coating of different magnesium alloys

Mahallawy, Nahed El; Bakkar, Ashraf; Shoeib, Madiha A.; Palkowski, Heinz; Neubert, Volkmar

doi:10.1016/j.surfcoat.2008.05.037

Cited by 95 publications

(66 citation statements)

References 29 publications

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“…[62]. More detailed measurements [64] of P across the interface, indicated that the phosphorous content increased gradually from the substrate towards the surface and exceeded 10wt% as shown in Figs. 4 and 5 for different substrate alloys with no sensitive effect of heat treatment on P redistribution.…”

Section: Distribution Of Elements In the Coat By Edx Analysismentioning

confidence: 81%

“…After heat treatment (HT), the deposit was similar in shape and quality, but with a smaller amount of cauliflower nodules. This result explained the decrease in surface roughness after HT due to coalescence and coarsening of the nodules [64]. The type of structure of the Ni-P deposits was investigated by X-ray diffraction.…”

Section: Surface Morphologymentioning

confidence: 89%

“…The results indicated that bright electroplating gave the least surface roughness, mirror-like which could be used for decorative purpose, followed by Ni electroplated, then electroless plated with stabilizer. Additionally, the surface roughness tended to decrease after the heat treatment process [64].…”

Section: Coat Surface Roughnessmentioning

confidence: 98%

“…Various structures in the deposit were also obtained such as amorphous [3], amorphous with microcrystals [39], and nano crystals of Ni and Ni-P compounds. After HT, amorphous Ni and P was found to crystallize and form Ni 3 P [3] while a mixture of amorphous and nano crystals separated from each other were also identified [64]. These different results indicate that the formation of amorphous or crystalline phases in the deposit depends on the plating conditions and procedure.…”

Section: Surface Morphologymentioning

confidence: 99%

“…The micrographs indicate that in all cases, the coat has a uniform thickness and a good adherence to the magnesium substrates with no defects in the coat or at the interface. It is to be noted that careful surface preparation and increasing the zincating time from 1 to 5minutes improved the adhesion, by eliminating the gap which could be formed at the interface [62]. It is also mentioned that the use of stabilizer for reducing the rate of deposition leads to better adhesion.…”

Section: Coat Thickness and Adhesionmentioning

confidence: 99%

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Surface Treatment of Magnesium Alloys by Electroless Ni –P Plating Technique with Emphasis on Zinc Pre-Treatment: A Review

Mahallawy

2008

KEM

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Magnesium alloys are attractive alloys in industrial applications , where light weight and good strength structures are required. Magnesium alloys are versatile and include both cast and wrought alloys. However, they have a drawback as they are prone to corrosion especially in harsh environments. For this reason, surface treatment of magnesium alloys is of prime importance for improving their corrosion characteristics.In the present paper, a survey of the different methods for surface treatment of magnesium alloys is presented and discussed. This is followed by a review of the recent work on electroless Ni plating technique with zinc pre-treatment applied on several magnesium alloys and the effect of pretreatment and post heat treatment on the coat characteristics. The surface morphology, surface roughness, thickness of the layer, EDX analysis, adhesion, hardness and corrosion resistance are covered in this review.

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Section: Distribution Of Elements In the Coat By Edx Analysismentioning

confidence: 81%

Section: Surface Morphologymentioning

confidence: 89%

Section: Coat Surface Roughnessmentioning

confidence: 98%

Section: Surface Morphologymentioning

confidence: 99%

Section: Coat Thickness and Adhesionmentioning

confidence: 99%

See 3 more Smart Citations