Additive for galvanizing agent

Galvanizing agent is an important process in pre-treatment of hot dip galvanizing,  it can not only make up shortage of the front process and active surface of steel, then lift galvanizing quality, which is not exit in other technics of steel anti-corrosion. It affects the quality of coating directly and can reduce zinc consumea and production cost.

Ⅰ、principle of additive for galvaniizng agent

Additive for galvanizing agent is composed of active agent with low surface tension, cleanser for Si, S, P on surface of metal、dewatering agent for workpiece、Fe²⁺complexant, etc. it can clean the surface of steel, remove ferroussalt and oxide left on surface of workpiece from rinsing after pickling, which can increase surface activity of workpiece when immersed into molten zinc, and prolong time of workpiece becoming rust during period of workpiece from fluxign into zinc kettle.

Ⅱ、capability of additive for galvanizing agent

1、the workpiece will be wettable and react with molten zinc quickly.

2、temperature of galvanizing agent is affected by this additive

The traditional temperature of galvanizing agent should be controlled within 60-80oC. When temperature below 60oC， the salt film on surface of workpiece after fluxign is not easy to dry, so zinc detonation is easy to appear； the temperature is too low may make the galvaniizng agent has low activity, which can not clean the surface of workpiece, meanwhile, the salt film on surface of workpiece is not enough, thw effect of galvanizing become bad, so the quality thickness should be increased,. When the temperature above 80^oC，the galvanizing agent may pile on suraface of workpiece and produce a double layer structure, which may lead to zinc detonation, increasing coating player thickness, increasing ainc ash, higher temperature may consume more heat energy, this additive for galvaznizing agent can reduce drying temperature and drying time obviously, besides, it can reduce salt film on surface of workpiece, reduce zinc detonation and shorten galvanizing time.

3、impurity content galvanizing agent is affected by this additive

This additive can complex Fe ion to deposit in galvanizing agent, so the Fe ion brought into zinc kettle by workpiece is few, which can reduce zinc slag that produce. Besides, the quality of water to mix galvanizing agent should be paid attention to, the effect og fluxing is influenced if quality of water is too hard, viz, Ca,Mi ion is too much,  this additive can solve this problem.

4、aluminium content galvanizing agent is affected by this additive

When there is a quantity of aluminium in molten zinc, it will react with NH₄Cl in salt film of galvanizing agent, and produce ALCl₃，which depress effect of this salt film, at this time, workpiece may not be wettable in molten zinc, and galvanizing-missing may appear. As to galvanizing agent under a technics condition, the molten zinc has a maximal safty aluminiumcontent, according to experience of many galvanizing factory，in molten zinc, when w_Al≤0.006%-0.007%，quality thickness of zinc chloridize and ammonium chloride in galvanizing agent should remain at 200-300g/L. when ammonium in molten zinc is too high, the quality thickness of NH₄Clin galvanizing agent should be increase. The additive for galvanizign agent produced by our company can dissolve alumina, by which quantity of ammonium chloride is unnecessary to increase,  it can form a thin oxide covery on surface of molten zinc, in which w_Al is lower than 0.04%. which can not only avoid oxidation of molten zinc and have no influence to fluxing effect, but also reduce the smoke.

This high efficient additive is widly used at area of shape steel, steel structure, cast iron, ball iron, malleable iron, steel thread etc. It can remove impurity on surface of workpiece and get good effect. 

Ⅲ、Using method       

Your production system is unnecessary to be redesigned when use this additive, it can be directly added into fluxing kettle.

When the consistency of this additive exceeds 1.5％，the wettability can be improved greatly,  increase the consistency continuously, the wettability increases a little, but the increase range is small. So in order to keep stability of galvanizing agent, the adding quantity of it is proposed to be 1.5％ of solution quantity in fluxing kettle.

Ⅳ、Notice： 
    1.Flush with water if it touch the skin.
    2. Flush 15 minutes with water if it splashs into eyes.

3. During galvanizing dipping, a light odor may be produced from thermolysis of surfactant, which is not harmful to body.