Zinc Plating

Nov -20 -2020

Zinc plating is identical to electro-galvanizing in principle because both are electro-deposition processes. However, zinc plating is used on small parts such as fasteners, crank handles, springs and other hardware items ratherthan sheet metal. The zinc is applied as an expendable electrode in a cyanide, alkaline non-cyanide, or acid chloride salt solution. Cyanide baths are the most operationally efficient but can potentially create pollutionand are hazardous.

After alkaline or electrolytic cleaning, pickling to remove surface oxides, and rinsing, the parts are loaded into a barrel, rack, or drum and immersed in the plating solution. Various brightening agents may be added to the solution to add luster, but careful control is needed to ensure a quality product. Post-plating treatments may be used to passivate the zinc surface as well as impart various translucent colors or to extend the life of the coating.

Zinc plating is typically used for screws and other small fasteners, light switch plates, and various small parts that will be exposed in interior or mildly corrosive conditions. For use in moderate or severe environments,the materials must be chromate-conversion coated for additional corrosion protection.

Type of surface protective layer	Abbreviated version	Plating method	Minimum salt spray time
			White rust time	Occurrence of red embroidery (same thickness as 1i of plating layer)
			White rust time	5um	8um	12um
zinc plating ,Transparent passivation	Zn//An//TO	rolling plating	8	48	72	96
zinc plating ,Transparent passivation	Zn//An//TO	hang plating	16	72	96	120
zinc plating ,colorful passivation	Zn//Cn//TO	rolling plating	72	144	216	288
zinc plating ,colorful passivation	Zn//Cn//TO	hang plating	120	192	264	336
zinc plating ,colorful passivation，Closed treatment	Zn//Cn//T2	rolling plating	120	192	264	360
zinc plating ,colorful passivation，Closed treatment	Zn//Cn//T2	hang plating	168	264	360	480
Galvanized iron alloy, colorful passivation	Zn Fe//Cn//TO	rolling plating	96	168	240	312
Galvanized iron alloy, colorful passivation	Zn Fe//Cn//TO	hang plating	168	240	312	384
Galvanized iron alloy, colorful passivation，Closed treatment	Zn Fe//Cn//T2	rolling plating	144	216	288	384
	Zn Fe//Cn//T2	hang plating	216	312	408	528
Galvanized nickel alloy, colorful passivation	Zn Ni//Cn//T0	rolling plating	120	480	720	720a
Galvanized nickel alloy, colorful passivation	Zn Ni//Cn//T0	hang plating	192	600	720	721a
Galvanized nickel alloy, colorful passivation，Closed treatment	Zn Ni//Cn//T2	rolling plating	168	600	720	722a
	Zn Ni//Cn//T2	hang plating	360	720	720	723a
Galvanized iron alloy, black passivation，Closed treatment	Zn Fe//Fn//T2	rolling plating	120	192	264	360
Galvanized iron alloy, black passivation，Closed treatment	Zn Fe//Fn//T2	hang plating	168	264	360	480
Galvanized nickel alloy, black passivation	Zn Ni//Fn//T2	rolling plating	168	480	720	720a
Galvanized nickel alloy, black passivation	Zn Ni//Fn//T2	hang plating	240	600	720	720a
Galvanized nickel alloy, black passivation，Closed treatment	Zn Ni//Fn//T0	rolling plating	48	480	720	720a
Galvanized nickel alloy, black passivation，Closed treatment	Zn Ni//Fn//T0	hang plating	72	600	720	720a

Zinc Plating

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