Wide temperature, wide current and wide brightness type cyanide-free alkaline zinc plating process

A cyanide-free alkaline galvanizing, bright type technology, which is applied in the wide bright cyanide-free alkaline galvanizing process, wide temperature, wide current field, can solve the uneven coating thickness, air flow, scars, large crystal grains, etc. problem, to achieve the effect of bright coating, easy passivation and low brittleness
CN102304731AInactive Publication Date: 2012-01-04武汉吉和昌新材料股份有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
武汉吉和昌新材料股份有限公司
Publication Date
2012-01-04
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention relates to a zinc plating process method, specifically to a wide temperature, wide current and wide brightness type cyanide-free alkaline zinc plating process. The process is as follow: 1 l of a zinc plating solution comprises of 8-12 g of ZnO, 120-140 g of NaOH, 15-20 ml of a brightener, 15-20 ml of a halogenated semicarbazide polymer; the cathode current density is 0.5-8.0A / dm<2>, the operating temperature is 5-45 DEG C. According to the present invention, the plating coat prepared through the process provided by the present invention has characteristics of brightness, uniformity, low brittleness, easy passivation; the operation is easy to be controlled; the amount of the brightener consuming is reduced so as to reduce cost and pollution.
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Description

technical field

[0001] The invention relates to a galvanizing process, in particular to a cyanide-free alkaline galvanizing process with wide temperature, wide current and wide brightness. Background technique

[0002] After adding brighteners (monomers, intermediates and their mixed compounds) to the cyanide-free alkaline galvanizing, the brightness and smoothness of the coating surface are greatly improved from a macroscopic point of view, which can basically meet the requirements. General needs; but from a microscopic point of view, the grains of the coating texture are relatively rough and loose, and some have less obvious airflow scars or tumors, and the difference in the thickness of the deposited layer between the high and low current areas is also relatively large , There are even rough high areas and missing plating in low areas. Although these defects are related to the dispersibility of the brightener, which is often referred to as "positioning" by people in the ...

Claims

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