Galvanized coating on pipe surface

Galvanized Steel are those steel that has been covered with a layer of zinc metal.

Galvanized coating has a number of characteristics that make it a well-suited corrosion protective coating for iron and steel products in most environments.

Th excellent field performance of Galvanized coating results from its ability to form dense, adherent corrosion product films of corrosion considerably below that of ferrous materials (some 10 to 100 times slower depending upon the environment). While a fresh zinc surface is quite reactive when exposed to the atmosphere, a thin film of corrosion products develops rapidly, greatly reducing the rate of further corrosion. In addition to creating a barrier between steel and the environment, zinc also has the ability to cathodically protect the base metal. Zinc, which is anodic to iron and steel, will preferentially corrode and protect the iron or steel against rusting when the coating is damaged.

Many different types of zinc and each has unique characteristics. These characteristics not only affect applicability but also the relative economics and expected service life.The method of processing, adhesion to the base metal, protection aff orded at corners, edges, and threads, hardness, coating density, and thickness can vary greatly among the diff erent coatings.This is practical aid discusses each of the major types of zinc coatings, applied by batch hot-dip galvanizing, continuous sheet galvanizing,electro galvanizing, zinc plating, mechanical plating, zinc spraying, and zinc painting, to help specialists assess and select zinc coatings for corrosion protection.

After deciding to use a Galvanized coating for corrosion protection, some factors must be considered to ensure the proper coating is selected for the intended application and service environment. Obviously, zinc coating processes which are limited to small parts, and operations limited to continuous lines in steel mills (i.e. continuous galvanizing and electrogalvanizing) cannot be considered for the protective coating of structural steel members. Each Galvanized coating reviewed provides various degrees of corrosion protection. When selecting a coating, it is important to investigate the corrosiveness of the exposure environment to ensure the Galvanized coating selected will provide adequate service life for the cost.

Related information of weld steel pipes:

Advantage of galvanized spiral pipe welding process

Galvanized pipe welding processes can be divided into spiral welded and straight seam welded, and galvanized spiral welding process is relatively wider number of applications, but also more complex.

Galvanized spiral pipe welding method is first out of the forward end portion of the electrode about 5 ~ 7mm, without leaving a blunt edge technology for centralized control to ease the industry needs to pay attention to seriously handle groove dimensions and near-plated zinc layer.

For penetration, undercut the tendency will be very small, If the front and rear of the round-trip transportation technology is used, generally 1.5 ~ 2.5mm; to reduce zinc weld penetration, with a focus on playing groove industry downturn, such as the use of short welding slag such as J427, to leave some space sector is expected to greatly reduce the liquid zinc remain in the weld, when welding fillet welds, you can get no defects of welding quality.

Advantages of galvanized spriral welding: the welding precision can not be compared for the straight seam welding, large diameter pipes or some special pipes are all used the spiral welded pipe, because spiral welding welding density is big, welding up is very flexible, welded together can form a variety of changes.

But straight seam welding can only weld one line, the curve of straight seam welding completely couldn't play the advantages, therefore, The use of spiral welded is the best choice.

Galvanized pipe process characteristics

Delivery information:

Material: SPHC,SPHD,SPHE,Q195-Q235,SAE1006
Size: OD (6-610 mm) x WT (1-50mm)
GTC (galvanized threaded and coupling) steel pipe: DN15-DN200 (NB1/2"-NB8")
GPE (galvanized plain end) steel pipe: DN15-DN200
Grooved steel pipe: DN15-DN200 (NB1/2"-NB8")
Section type: round, square, rectangular, oval and other special section type.

Anticorrosion performance of galvanized mild steel pipe

Mild steel pipes and is one of the low carbon steel pipes with low carbon content and the lesser hardness.

Galvanized mild steel pipe is cheap and anticorrosive performance is relatively better related stainless steel pipes.

Galvanized pipe in the design and production of an important form of full use of the standard design, galvanized mild steel pipe is generally pipe joints, mainly for low domestic water pipes, low cost, good corrosion resistance, connections are made using British Elbow, tee, short sections to achieve, and generally do not have the means to connect welding, welding will destroy the zinc coating, welding slag prone plus, porosity phenomenon and the impact of anti-corrosion effect.

+ Galvanized Mild steel pipe

Galvanized mild steel pipe is to use the principle of electrochemical corrosion, cathodic protection and consumed mainly in the steel and zinc anode contact, carbon steel a cathode, zinc as the anode, thus ensuring that the steel from corrosion. Generally used for process instrumentation or process water piping is threaded connections for multi-temperature low-pressure pipeline medium without danger. Galvanized mild steel pipe are generally after surface treatment on its surface coated with a layer of protective film, with hot dip and cold-plated to prevent corrosion.

Galvanized mild steel pipe because of high potential than iron, zinc corrosion first, so it protected the iron pipe, and if not threaded connection, you can also use welding methods, welding room ventilation must be good, because zinc oxide is toxic to humans with acid electrode J422 can be welded.

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