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12/27/2016 Galvanizing Process Hot Dip Steel Galvanising Process UK Ireland

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Cleaning cycle

Hot dip galvanizing i the proce of coating iron or teel with a laer of zinc immering the metal in a ath of molten zinc at a temperature of around 842 °F(450 °C). During the proce, a metallurgicall onded coating i formedwhich protect the teel from harh environment, whether the e external orinternal. Galvanized teel i widel ued in application where corroion reitance ineeded without the cot of tainle teel and can e identified  thecrtallied pattern on the urface (often called a ‘pangle’). Galvanizing i proal themot environmentall friendl proce availale to prevent corroion.

The galvanizing reaction will onl occur on a chemicall clean urface. In common withmot coating procee, the ecret to achieving a good qualit coating lie in the

The hot dip galvanizing proce i relativel imple. It involve cleaning teeland immering it in molten zinc to otain a coating.

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12/27/2016 Galvanizing Process Hot Dip Steel Galvanising Process UK Ireland

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preparation of the urface. It i eential that thi i free of greae, dirt and cale eforegalvanizing. Thee tpe of contamination are removed  a variet of procee andcommon practice i to degreae firt uing an alkaline or acidic olution into which thecomponent i dipped. The article i then rined in cold water to avoid contaminatingthe ret of the proce.

The article i then dipped in hdrochloric acid at amient temperature to remove rutand mill cale. Welding lag, paint and heav greae will not e removed  theecleaning tep and hould e removed  the faricator efore the work i ent to thegalvanizer. After further rining, the component will then commonl undergo a fluxingprocedure. Thi i normall applied  dipping in a flux olution – uuall aout 30%zinc ammonium chloride at around 65-80°C. Alternativel, ome galvanizing plant maoperate uing a flux lanket on top of the galvanizing ath. The fluxing operationremove the lat trace of oxide from the urface and allow the molten zinc to wet theteel.

GalvanizingWhen the clean iron or teel component i dipped into the molten zinc (which icommonl at around 450°C) a erie of zinc-iron allo laer are formed  ametallurgical reaction etween the iron and zinc. The rate of reaction etween the teeland the zinc i normall paraolic with time and o the initial rate of reaction i verrapid and coniderale agitation can e een in the zinc ath. The main thickne ofcoating i formed during thi period. uequentl the reaction low down and thecoating thickne i not increaed ignificantl even if the article i in the ath for alonger period of time.

A tpical time of immerion i aout four or five minute ut it can e longer for heavarticle that have high thermal inertia or where the zinc i required to penetrate internalpace. Upon withdrawal from the galvanizing ath, a laer of molten zinc will e takenout on top of the allo laer. Often thi cool to exhiit the right hin appearanceaociated with galvanized product.

Post treatmentPot galvanizing treatment can include quenching into water or air cooling. Conditionin the galvanizing plant uch a temperature, humidit and air qualit do not a៊�ect thequalit of the galvanized coating.  contrat, thee are criticall important for goodqualit painting. No pot treatment of galvanized article i necear and a paint or apowder coating ma e applied for enhanced aethetic or for additional protectionwhere the environment i extremel aggreive. Chemical converion coating andother arrier tem ma e applied to minimie the occurrence of wet torage tain.

12/27/2016 Galvanizing Process Hot Dip Steel Galvanising Process UK Ireland

http://www.galvanizing.org.uk/galvanizingprocess/ 4/8

Galvanizing turnaround timesProvided reaonale notice i given, mot article can e galvanized and returned tothe faricator within a week. A tpical turnaround, depending on ize of the order, ithree da. Galvanized olt and nut are now widel tocked ut it i adviale thatorder for galvanized fatener hould e placed a earl a poile.

Size of galvanized articles

The hot dip galvaniing proce i ver veratile and article ranging in ize from nutand  olt  to  long  tructural  ection  can  e  treated.  Thi  range,  together  with  theailit to olt or weld farication after galvanizing, allow almot an ize of tructureto  e  galvanized.    Complex  hape,  open  veel  and  mot  hollow  article  can  egalvanized,  inide  and  out,  in  one  operation.  Certain  hollow  farication  ma  egalvanized  on  the  outide  urface  onl,  however,  thi  require  pecial  deign  andgalvanizing technique. The capacit of individual galvanizing plant i detailed in theDirector of General Galvanizer, availale free of charge from Galvanizer Aociation.

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