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How To Distinguish The Hot-Dip Galvanized Steel Pipe And Electrogalvanized Steel Pipe?

Time:2019-04-23 From:Ouersen Steel Industrial Limited Hits:

  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.

  Hot-Dip Galvanizing

  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 formed.

  Electro-galvanizing

  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 pipe

  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 microns.

  2.Appearance

  hot dip galvanization has dull, unpleasant finish.However, Electro-galvanization comes with excellent finish.

  3.Life

  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.

  4.Costs

  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.

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