.Look at the craftsmanship
Hot-dip galvanized is a process of degreasing, pickling and other processes to complete the galvanizing treatment after infiltration.
Although Pre-galvanized is also subjected to degreasing and pickling, it is finally obtained by electrolysis.
- Look at the appearance
Hot-dip galvanized surfaces will be slightly rough silver-white.
Pre-galvanized surfaces will have a smooth, multi-colored yellow-green surface.
- Look at the thickness
Hot-dip galvanized average zinc layer thickness is 10-150 microns.
Pre-galvanized average zinc layer thickness is only 3-5 microns.
- Look at the surface
Hot-dip galvanized surface is rough.
Pre-galvanized surface is smooth
- Where to use
Hot-dip galvanized is mainly used for outdoor projects.
Pre-galvanized is mainly used for indoor projects
- The warranty time
Hot galvanized can be used for 20 years outdoors.
Pre-galvanized can be used for 10 years indoors.
- Look at the degree of corrosion resistance
Hot-dip galvanized corrosion resistance is strong.
Pre-galvanized corrosion resistance is weak
- Look at the environment
Hot-dip galvanized can be used in harsh, hydrochloride, corrosive environments.
Pre- galvanized can only be used in dry, non-corrosive environments.