Causes of surface roughness of galvanized steel angle
1. Pre-plating treatment process produces "over pickling", the angle galvanized steel surface roughness of the impact.
Over pickling" makes the steel surface rough or produce bean marks, which is also one of the reasons for the surface roughness after hot-dip galvanized workpiece.
2. Zinc liquid temperature is too high or dip zinc time is too long, on the angle steel galvanized layer surface roughness.
When the temperature of the zinc solution is too high and the dipping time is too long, or due to the influence of the angle composition and the Sundeling effect, so that the Zn-Fe alloy phase is generated too much or unevenly, it will also cause surface roughness. The thicker the galvanized layer, the rougher the surface.
Hot-dip galvanized angle from the zinc liquid after taking out the slow cooling, or steel section is too thick, or hot-dip galvanized angle without isolation immediately after stacking and other reasons, there will be surface roughness phenomenon.
3. Angle manufacturing selection of steel composition or surface conditions, the angle galvanized layer surface roughness of the impact.
The smoothness and roughness of the galvanized surface are relative. With steel plate, steel pipe or steel wire "continuous hot-dip galvanizing" is different, hot-dip galvanizing of steel angle belongs to the category of batch hot-dip galvanizing process, galvanized layer is not blown by the air knife wipe. If the steel surface used for hot-dip galvanized steel angle is originally rough and uneven, with corrosion pits or obvious rolling stripes, hot-dip galvanized after the completion of its surface is generally not more flat and smooth than the original.
In general the rough galvanized layer can be accepted, because it does not affect the use, but also more corrosion resistance, longer service life, because the rough galvanized layer is often much thicker than the smooth galvanized layer, but the appearance is not very good to see.
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