Nickel coatings chloride solution

Passivity.—It is now a matter of common knowledge that platinum, like iron, cobalt, and nickel, exhibits passivity under certain conditions.5 Possibly this is due to the formation of a superficial layer of oxide which protects the underlying metal from attack. This explanation is supported by the fact that during the electrolysis of platinum chloride solution with platinum electrodes, the anode becomes slightly coated with oxide,6 and the same is true when dilute sulphuric acid containing from 2-5 to 10 per cent, of acid is similarly electrolysed.7... 

Nickel-coated poly-p-phenylene terephthalamide film was prepared as follows. A section of poly-p-phenylene terephthalamide film was immersed momentarily in a 0.1 M solution of K+ 0-t-Bu in DHSO and then in a 0.1 M solution of silver trifluoroacetate in DHSO. The film was washed liberally with water and dried. Nickel was plated onto this silver-activated film using a known method of electroless plating as follows a section of film weighing 0.038 g was immersed in a solution of 5.0 g of nickel chloride hydrate and 0.2 g of dimethyl amine borane in a mixture of 50 mL of water and 50 mL of dimethyl formamide for 1.5 hrs. The film was then rinsed liberally with water and dried in a vacuum oven at 110 C for 2 hrs. The resulting nickel coated film weighed 0.095 g and was electrically conductive. 

Arsenault, B., Champagne, B., Lambert, P., and Daillaire, S. (1989). Zinc-nickel coatings for improved adherence and corrosion resistance. Thermal Spray Technology New Ideas and Processes. ASM International, Metals Park, OH, pp. 409-416. Ashworth, V., and Fairhurst, D. (1975). The effect of temperature on the behaviour of a zinc-mild steel couple in a solution containing chloride ions. Corros. Sci., 75(11-12), 669-686. 

Metal Coatings. Tellurium chlorides, as well as tellurium dioxide in hydrochloric acid solution, impart permanent and attractive black antique finish to silverware, aluminum, and brass. Anodized aluminum is colored dark gold by tellurium electro deposition. A solution containing sodium tellurate and copper ions forms a black or blue-black coating on ferrous and nonferrous metals and alloys. Addition of sodium tellurite improves the corrosion resistance of electroplated nickel. Tellurium diethyldithiocarbamate is an additive in bright copper electroplating (see Electroplating). 

Fig. I. Crosman BB shot beads plated with bright nickel and black nickel (for color coding purposes), then coated with polycarbonate by immersing in 5% solution of methylene chloride, scattering on slick paper, and allowing to dry. Various antigens or antibodies are adsorbed onto this plastic surface the beads are soaked in a % solution of bovine serum albumin in phosphate-buffered saline, drained, air dried, and stored below 0° until needed.

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