Which Is Better Hot Dipped Or Electro Galvanized?

Galvanizing is considered the technique of applying a protective zinc coating to iron or steel to prevent rusting. Best efforts should be made in several services. This is actually to keep the pipes from rusting. Otherwise, there may be danger to personnel and may result in malfunction or damage to instruments, equipment, etc.
Some of the common techniques used for galvanizing are called electro galvanizing and hot-dip galvanizing.
If planning to order the same product, it is necessary to conduct a proper and thorough study of the materials available on the market. This can help people to be safe when choosing and to ensure that they are buying the right and most suitable product that meets the specific needs and requirements of the business. Otherwise, you will just waste precious time and money. Professionals who provide hot dip galvanizing services can assist with the selection process.
Some of the basic differences between electrogalvanizing and hot-dip galvanizing are given below. There are also benefits offered by both parties.
For hot dip galvanizing, a very strict cleaning process is followed, commonly referred to as a 7-bath process. Cleaning, pickling, water washing, and fluxing are performed in an alkaline solution. In the case of electrogalvanizing, strict cleaning methods are not followed.
The hot dip galvanized coating is said to be achieved by dipping the steel in a bath of molten zinc at 460 degrees Celsius. In the latter, however, the steel is produced in the cathode of the electrolytic cell, so an electroplating process is used to form the coating.
Hot-dip galvanizing produces an iron-zinc alloy layer on the steel surface, leaving a pure zinc coating on the outer surface. This alloy is quite hard. The usual wear and tear will not cause damage to the coating, even though some damage may occur to the pure soft zinc on top. The zinc layer produced on the surface by electrogalvanizing is metallurgically called discontinuous with the steel.
The life of electrogalvanizing is very short, ranging from a few months to several years. However, hot dip galvanizing is known to have a very long service life, averaging between 20 and 50 years.
Electro galvanized has an excellent finish. However, hot dip galvanizing has a dull, unpleasant surface.
The thickness of the hot-dip galvanized coating is generally about 80-100 microns. The thickness of the coating depends entirely on the immersion time. In addition, it is affected by the roughness and composition of the steel. For electrogalvanizing, the coating thickness is generally around 10 to 12 µm. Here, the coating thickness depends on the electrolyte temperature and current density.
Compared to electrogalvanizing, the normal coating thickness of hot dip galvanizing is about 40%, which is much more expensive. The latter has a normal coating thickness and is affordable. However, the cost is said to increase proportionally with the thickness of the coating. Therefore, it becomes expensive.
Hot dip galvanizing is a non-uniform coating, and the other is a uniform coating.
Hot-dip galvanizing is suitable for all sizes, while electro-galvanizing is only suitable for smaller parts.

Hot-dip galvanizing and electro-galvanizing not only have different coating formation mechanisms, different production processes, but also different product properties and uses. The following article will specifically introduce the difference between galvanized sheet and hot-dip galvanized sheet.

Hot dip galvanizing is a method of metal corrosion protection. After pretreatment, the electroplated metal or non-metallic material is immersed in liquid metal zinc, so that a zinc layer is attached to the surface of the steel, thereby improving the corrosion resistance of the material and improving the performance of the material.

Process flow:
The production process of hot-dip galvanizing is: The production process of hot-dip galvanizing of pre-plated parts is: pre-plated parts → degreasing → water washing → pickling → water washing → extrusion → water soluble → drying → galvanizing → cooling → straightening → oiling → Package.
The basic process of electro-galvanizing is as follows: parts pre-plating→degreasing→corrosion→polishing→galvanizing→hydrogen removal→passivation/dyeing.

benefit:
Hot-dip galvanized products have the advantages of thick zinc layer, good corrosion resistance, beautiful appearance, favorable for subsequent processing, low production cost, and reduced environmental pollution.
Electrogalvanizing has the advantages of good processability, good weldability and coating, good surface quality, and does not change the mechanical properties of the original plate during the production process.

surface:
The surface of hot-dip galvanizing is dark and slightly rough, which will produce process water lines, dripping tumors, etc., especially at one end of the workpiece, which is silver-white in appearance.
Electrogalvanizing can form a uniform and dense galvanized layer, the surface is smooth and bright, and the quality of the coating is better than that of hot-dip galvanizing. The surface of electro-galvanized is relatively smooth, mainly yellow-green, of course, there are also colorful, blue-white light, white light and green light.