The Phoenix Galvanizing Group is owner managed and is a product of family value, integrity, ingenuity and entrepreneurship.
Phoenix Galvanizing proudly offers our customers the assurance of excellent quality hot-dip galvanizing through our SABS SANS 121:2011 Certification.
We are also an ISO 9001:2008 Quality Management Systems Certified Company, assuring our customers of world-class service and communication.
The inspection of hot-dip galvanized steel is simple and quick. The two properties of the hot-dip galvanized coating most closely scrutinized are coating
thickness and appearance/surface condition. A variety of simple physical tests can be performed to determine thickness, uniformity, adherence, and appearance.
Materials are galvanized according to long established, accepted, and approved standards of SABS SANS 121. These standards cover everything from the minimum
coating thicknesses required for various categories of galvanized items to the composition of the zinc metal used in the process.
Zinc Coating: During the galvanising process, the zinc coating forms a metallurgical bond with the underlying steel. The molten zinc reacts with the surface of the steel to produce layers of zinc-iron alloys. The adherence of the coating is very high, typically between 20 – 30 M.P.A. The steel must be perfectly clean prior to dipping to avoid bare spots.
The inner layer, comprising a 75:25 zinc-iron alloy, is extremely hard & resistant to damage. The middle layer is a 90:10 zinc-iron alloy & the surface layer is pure unalloyed zinc & quite ductile. If the coating is physically damaged the galvanising will continue to provide cathodic protection to the exposed steel. Zinc corrodes very slowly but preferentially to the iron or steel, preventing the spread of corrosion from the exposed area. This is in contrast to other coatings that experience under-creep corrosion where there is a gap or pinhole in the coating.
The galvanised coating provides a uniform thickness of zinc on flat surfaces, & penetrates recesses to provide complete protection to potential corrosion spots. With painting, the coating thickness on the edges is less than on flat surfaces. This is in contrast with hot-dip galvanising, which provides full corner edge protection. These corners normally have 50% more zinc than the flat surfaces.
The thickness of the hot-dip galvanised coating is relative to the thickness of the steel profile that is to be galvanised. The zinc coating on a 3mm profile will be approximately 85-100 µm; thereafter the coating gets heavier according to the thickness of the steel profile, providing an extra-long lifetime.
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