221 Bright Alkaline Cyanide-Free Zinc Plating Process
Name???221 Bright Alkaline Cyanide-Free Zinc Plating Process
221 process is the newest cyanide-free zinc plating technology, It overcomes the problem of embrittlement even in mirror bright and thicker deposits. The metal distribution and the temperature tolerance of the electrolyte are more perfect .
???Mirror Bright Coating
221 Brightness is higher than the Cyanide Zinc Plating Process and Conventional Alkaline Zinc Plating Process, and comparable to Acid Zinc. Passivating without fogging haziness.
???Avoids Yellowing Problem Of Blue Chromate
221 Alkaline Zinc after blue chromate, the coating is deep blue, comparable to Acid Zinc.
???Not Hazy Of Yellow Trivalent Chromating
221 Alkaline Zinc coating is clear and transparent; the Cyanide Zinc Plating coating is tend to fogging be hazy.
???High Bright Deposit Without Embrittlement
???High Throwing Power and Even Metal Distribution
High throwing power, and even thickness of coating, greatly saves the consumption of Zinc ingot, saving 25-40% than Acid Zinc, 15-30% than Cyanide Zinc Plating.
Left fig: the thickness of outer coating is 25??m, inner is no less than 17??m 221??????
??? Tolerance to High Temperature
When the bath temperature is 50???, the coating is still mirror brightness bright.
??? Excellent Covering Power
The covering power is superior to Cyanide Zinc Plating and Acid Zinc.
???Super Adhesion to Passivation Film
The adhesive force of 221 Alkaline Zinc coating is greater than Acid Zinc, and is comparable to Cyanide Zinc Plating.
???Wide Current Operating Range
When the current is 6A in the Hull Cell, the whole specimen panel only has 0.5 cm burnt, when 0.2A, the specimen panel can be bright.
???Strong Impurity Tolerance
???The bath can be prepared with ordinary and tap water ,no need for 99% high purity alkaline hydroxide and pure water.
???Strong tolerance of impurity from pretreatment, the test is as follows:
Comments: It is better to carry out the pretreatment completely, and use high purity alkaline and pure water to prepare the cell bath.
???Key Points Of Maintenance
221 A brightener 5-25ml/L,
221B Carrier 0.5-1.5ml/L,
221C purifier 0.5-1.5ml/L.
221A brightener 100-200ml/KAH,
221B Carrier 20-70ml/KAH,
221C purifier 10-20ml/KAH.