1999年7月1日 · The second zincate in the double zincate process forms a much thinner zinc coating since most of the etching has already taken place in the first zincate step. This thin coating assures good adhesion by making it easier for the plating solution to …

2024年11月30日 · Double zincating has a minimal impact on the grain morphology and size of the Au electroplated layer. However, it does result in a reduction in the surface undulation of the aluminum alloy substrate and an improvement in the continuity of its surface platings.

Is double zincate required for Electroless Nickel Plating on Aluminum? Q. Is Double Zincate or a Copper Flash included in the Electroless Nickel Coat spec. AMSC26074 Class B or spec AMS2404 ?

2024年1月11日 · In some applications, a double zincate dip is preferred. This would refer to cast alloys, wrought alloys containing little or no magnesium, and unknown alloys. In this modification, the first zincate film is deliberately stripped in either 50% nitric acid or in a commercial, nitric acid-free stripping solution.

The double zincate treatment by the basic solution improved the adhesive strength to 36N/m, and the triple zincate treatment showed almost the same adhesive strength

Double zincating is a preferred method for plating aluminum and is especially useful on certain difficult-to-plate aluminum alloys to ensure better adhesion of the final metal...

2020年1月25日 · Modified alloy zincate (MAZ) is a surface-treatment process for depositing Zn on Al by galvanic displacement reaction prior to application of functional coatings. Two-step zincating i.e. double zincating (DZ) is a preferred technique in comparison to single zincating (SZ) because of imparting excellent adhesion of coatings on Al.

2009年8月1日 · For this purpose, zincate treatment is commonly adopted which covers surface of substrate with zinc film by displacement reaction of aluminum and zinc. Especially, the double zincate treatment [4] which repeats a conversion treatment twice shows remarkable increase in adhesive strength of the electroless Ni-P coating onto aluminum alloy substrates.

It is found that the Ni-P amorphous plating with thickness of 178 µm can be obtained by double zincate pretreatment method. The amorphous coating surface presents a typical cauliflower …

1996年6月1日 · We studied the mechanism behind the double-zincate process, used for pretreating aluminum alloy, through SEM observation, electrode potential tracing, and weight changes determined during each zincate process. Zinc particles grew during the first zincate process, with a thin, uniform Zn layer forming during the second zincate process.