 |
|
|
| |
The basic elements to the galvanizing process : |
|
| |
 |
Surface Preparation. |
|
Galvanizing. |
|
Inspection/ Finishing. |
|
|
| |
|
|
| |
Surface Preparation |
|
| |
|
Surface preparation is the most important step in the application of any coating. In most instances, where a coating fails before the end of its expected service life it is due to incorrect or inadequate surface preparation.
With galvanizing, the surface preparation process contains its own built-in means of quality assurance and quality control in that zinc will simply not react with a steel surface that is not perfectly clean.
Surface preparation for galvanizing typically consists of three steps : |
| |
|
|
|
| |
|
|
| |
Galvanizing |
|
| |
| |
|
| In this step, the material is completely immersed in a bath of a minimum of 98% pure molten zinc. The bath temperature is maintained at about 4500C. Fabricated items are immersed in the bath long enough to reach bath temperature. The articles are slowly withdrawn from the galvanizing bath , and the excess zinc is removed by draining, vibrating, and/or centrifuging. The steel then goes into a dilute chromate quench giving your product a longer lasting luster. |
 |
|
|
| |
|
|
| |
Inspection / Finishing |
|
| |
| |
|
| The most important method of inspection for galvanized articles is visual. A variety of simple physical and laboratory tests may be performed for : |
|
Thickness, |
|
Adherence of the coating, |
|
Uniformity of the coating, |
|
Appearance |
|
|
 |
|
|
| |
|
|
