Hot Dip Galvanizing

Click to see the process video (courtesy of PhilGav)

Chemistry for outstanding finish.

Throughout the years, MCT have developed the R&D capabilities to introduce products that redefined the HDG process to a whole new level. A good HDG process includes a perfectly balanced chemistry in each of its pre-treatment process as well as the metallurgy of the zinc bath. MCT strives to achieve in both areas, providing various ingenious product for cleaning of the steel articles, degreasing; both alkaline and acid, pickling process and also fluxing.

Our portfolios also include additives for zinc bath, a brain-child of our CEO and scientist as a well as environmental-friendly passivation chemicals, ones that of course not in yellow/orange shade.

What experts say about chemicals used in HDG?

We communicate with you constantly – so you can stay up-to-date on ways to get your process right, and stay right.

Cleaning Chemical for HDG

Each galvanizer optimizes their cleaning chemicals to give them the best results at cleaning the steel or iron and achieving a high-quality hot-dip galvanized coating. There are some materials the cleaning chemicals used prior to galvanizing cannot remove or have great difficulty removing; very heavy or extremely adherent mill scale, oil-based paints and markers, very heavy or thick deposits of wax or grease and more. – Bernardo A. Duran III, American Galvanizers Association

Alkaline Degreases and why use them?

Alkaline degreaser has very good degreasing performance (at minimum 50° and removal of paint and grease is possible. The cost of chemical is also relatively lower than acid degreaser and lower consumption compared to acid degreaser. – Jürgen Kader, Stockmeier Chemie GmBH & Co. KG, German

Advantages using Acid Degreasers

Advantages of acidic degreasing baths are that the pickling process already starts during the degreasing and, more importantly, that grease does not dissolve in the bath, thus has virtually unlimited service life. – Vlastimil Kuklík, Jan Kudláček, in Hot-Dip Galvanizing of Steel Structures, 2016

Additives and tips on reducing wastage

Most of your zinc will end up on the parts as the final product to be sold, but there is no need to give away free zinc to the customer beyond the minimum specification requirements. However, reactive and/or thick steels can be problematic as zinc pickup is often high or excessive for these materials. To optimize coating thickness, you should address steel chemistry, the cocoon effect, withdraw rates, and the use of bath alloying elements. – Alana Fossa, American Galvanizers Association

Product Range

Select categories below and click the products for more information

Cleaning

Leraclen® OKE	Product for pre-treatment of extremely tenacious contaminations such as mill scale, oil carbon
Leraclen® ZNR	Product for pre-treatment of extremely tenacious contaminations such as mill scale, oil carbon
Maha PaintSolves	Products to remove paint markings on articles

Degreasers

Leraclen® 178 series	Degreaser with extremely good degreasing performance, silicate free, emulsifying, powder
Leraclen® ATR series	Degreaser with extremely good degreasing performance, free of phosphate, sulfate and silicate, strongly emulsifying, surfactant containing high concentrate, liquid
Lerabilt® 268 series	Builder for the preparation of alkaline low temperature degreaser in combination with special surfactants; extremely good degreasing performance, silicate-free, phosphate free, liquid
Leratens®RVP series	Product for the preparation of alkaline degreaser in combination with sodium or potassium hydroxide; extremely good degreasing performance, silicate-free, emulsifying, powder
Leraclen® H series	Degreaser based on mineral acid with very good degreasing performance, phosphate-free
Leraclen® 1231 series	Degreaser based on phosphoric acid with extremely good degreasing performance and unlimited bath life (never dump), liquid
Leraclen® PF series	Degreaser based on mineral acid with very good degreasing performance, self-regenerative, phosphate-free, liquid
Leraclen® BEF	Pickling degreaser with extremely good degreasing performance, also stable at high iron concentration, inhibiting effect, also suitable for high strength material (DSV/GAV listed)
Leratens®1019	Pickling degreaser with extremely good degreasing performance, also stable at high iron concentration, inhibiting effect, also suitable for high strength material (DSV/GAV listed)

Pickling

Leratens®AV	Additive for vapor foaming
Leratens®AVS	Additive for vapor suppressing & inhibition, foaming
Leratens®AV Plus	Product for reduction of pickling vapor and mist, to decrease floating substances and for reduction of acid consumption
Leratens®AV Ultra	Product for reduction of pickling vapor and mist, to decrease floating substances and for reduction of acid consumption
Lerapas® 1018	Inhibitor for reduction if iron dissolving and acid consumption, also suitable for high tensile material. Against hydrogen embrittlement
Lerapas® MCA 60 DC	Inhibitor for reduction of iron dissolving and acid consumption
Lerapas® MCA-i	Inhibitor for reduction of iron dissolving and acid consumption, free of foam

Pre-Flux

Leratens®Flux Additive FF	Surfactants for reduction of surface tension, not foaming, better wetting, less carry-over
Leratens®Flux Additive S	Surfactants for reduction of surface tension, foaming, better wetting, less carry over
MahaFluxes	Triple salt of zinc ammonium chloride with reduced surface tension
Lerapas® Flux	Triple salt of zinc ammonium chloride with excellent wettability and fast drying
Lerapur® FS 60	Defoamer, water soluble, silicone oil-free