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Immersion (deposition) of zinc on aluminium before electroplating

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3 immersion zincate solns. were studied: (a) Bondal, containing Zn sulphate 40, Ni sulphate 30, NaOH 120, KCN 10 g/l, (b) same soln. but with NaCN replacing KCN, (c) cyanide-free soln. Much better, finely crystalline deposits with excellent coverage are obtained in presence of cyanide. Temp. affects deposit thickness and forming rate and control of forming rate improves adhesion. Adhesion on high Si alloys is esp. improved by addition of cyanide.

Immersion Alloy Pretreatment for Electroplating on Aluminium

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Description of Zn replacement coating on Al & benefits of complexing agents cont'g certain other ions to give film of controlled thickness, the comp'n of which changes progressively with thickness. Data on Ni adhesion to Al with various treatments. Rate of zincate film form'n in various sol'ns. Rate of incorp'n of Ni in zincate film. Table of 7 metals & rate of their replacing Zn. Micrographs.

Immersion Barrel

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Immersion Barrel with Cassette Sides

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Immersion behavior of plasma-sprayed modified hydroxyapatite coatings after heat treatment

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Immersion can coating

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Ferro-magnetic cans are coated in bath by magnetically holding and transporting cans on travelling conveyor belt with closed can bottoms held to belt and open top facing away from it; transporting cans into coating bath at angle whereby edge of closed bottoms enters bath before edge of open tops; immersing cans; and transporting them at angle whereby edge of closed exits before edge of open tops.

Immersion can coating apparatus

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Magnetic conveyor assembly for use in immersion coating of open-topped ferromagnetic cans, comprises immersion coating bath, support frame, and endless belt magnetic coating conveyor rotatably supported by frame and holding closed bottoms of cans moving between inlet and outlet ends whereby coating flows into and out of cans as they move through bath.

Immersion Cleaning Baths

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Reports response to stricter effluent discharge legislation and describes (with process flowsheets) cleaning & rinsing stages with microfiltration or ultrafiltration.

Immersion coating apparatus

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Immersion coating apparatus comprising drum

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Immersion coating of drums

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Immersion coating of etch resists on printed circuit boards

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Note on different methods of coating incl. continuous conveyor and timed immersion-withdrawal, also roll-to-roll for flex circuit substrate. The method allows lower coating thicknesses - 8 to 12µm, to be achieved and adhesion-free surface of the dried liquid resist allows illumination exposure mask to be laid direct onto dried resist film, thus permitting formation of very fine tracks & spacings.

Immersion coating process

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Immersion Coatings on Aluminium

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The rate of zincate and tin immersion coatings on Al are given, with extensive TEM photos of structures. Dist'n of crystal morphologies is listed for 2 sol'ns.

Immersion coatings on aluminium

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During study of morphologies of Zn and Sn immersion deposits on Al and its alloys, Zn was found to form epitaxial deposits on alloys, as was previously observed on pure Al. Similarities are shown to exist between zincate and stannate processes; in particular studies of deposits on single-crystal spheres show that same crystallographic orientations are active in both systems. Comparison between Zn deposits produced from solns. containing FeCl3 and additions indicate that FeCl3 plays fundamental role in deposition process.