How To Distinguish The Hot-Dip Galvanized Steel Pipe And Electrogalvanized Steel Pipe?
Galvanized pipes are the pipes that a layer of protective zinc coating to
pipe in order to prevent premature rust and corrosion. There are several
different processes for galvanizing steel pipe,Hot-Dip Galvanizing and
Electrogalvanizing are the most commonly used ways for steel pipes.To
distinguish the Galvanized steel pipe and Electrogalvanized steel pipe,you
should understand the manufacturing process of them.
As the name implies, this method involves dipping the base metal into a
molten pool of zinc. First, the base metal must be cleaned either mechanically,
chemically, or both to assure a quality bond can be made between the base metal
and the zinc coating. Once cleaned, the base metal is then fluxed to rid it of
any residual oxides that might remain after the cleaning process. The base metal
is then dipped into a liquid bath of heated zinc and a metallurgical bond is
Electrogralvanizing utilizes an electrical current in an electrolyte
solution to transfer zinc ions onto the base metal. This involves electrically
reducing positively charged zinc ions to zinc metal which are then deposited on
the positively charged material. Grain refiners can also be added which helps to
ensure a smooth zinc coating on the steel.
The main difference between Galvanized pipes and Electrogalvanized steel
1.The zinc layer
The thickness of hot dip galvanized zinc layer can achieved more than 50
microns, the maximum can reach 100 microns.Electro-galvanized zinc layer
generally in the 3 to 5 microns, special requirements can also reach 7 to 8
hot dip galvanization has dull, unpleasant finish.However,
Electro-galvanization comes with excellent finish.
Hot dip galvanized pipe is known to have very high life averaging between
20 to 50 years.But, lectro-galvanization has very low life, ranging from several
months to some years only.
The cost is said to increase proportionately with higher coating
thickness.hence the hot dip galvanized pipe with normal coat thickness about 40%
expensive than electro-galvanizing pipe.