Powder Coating Galvanized Steel Sheet

Galvanized steel versus powder coatings for outdoor environments thursday april 13 2017 chipping fading and corrosion are common concerns when deliberating over the use of galvanized steel coating or powder coating for outdoor furnishings such as handrails and guardrails bike racks playground equipment and park benches.

Powder coating galvanized steel sheet. Hot dip galvanizing is coating of metallic zinc bonded with steel to form a source of corrosion protection for steel. The galvanized coating protects the base steel supplying cathodic and barrier protection. There are certain powder coating companies that have better knowledge of this process and will do a more reliable job of it and some that are not as good. En 15773 industrial application of powder organic coatings to hot dip galvanized or sheradised steel articles duplex systems specifications recommendations and guidelines provides additional information concerning communication within.

Make sure the coater has had previous experience with powder over galvanized steel. One of the most durable protective coatings for steel is provided by applying a polyester powder coating over hot dip galvanized steel to provide a high grade architectural finish to steel items. Powder coating galvanized steel for architectural applications is covered at present by en 13438. Recently we have a requirement of powder coating ral 9006 jotun make on hot dip galvanized tanks of size app 1 5 mtrs x 1 mtr x 1 mtr.

We are facing problems in powder coating. When paint and galvanized steel are used together the corrosion control provided is superior to either system used alone. Even though this standard is specific to powder coating of galvanized steel it contains the same cleaning and preparation techniques for the surfaces coated with liquid products as astm d6386 and sspc sp 16. This process can be difficult to perform properly if quality control procedures are not in place and can result in uneven coating and pinhole spots where the coating does not adhere.

Bubble problems powder coating galvanized steel 2004. Check for experience with galvanized as a substrate and see what the powder coater can offer for a warranty. A duplex system is simply painting or powder coating steel that has been hot dip galvanized after fabrication. One of the most durable protective coatings for steel is provided by applying a polyester powder coating over hot dip galvanized steel to provide a high grade architectural finish to steel items.

Even so there are still some problems during this application. However astm d7803 includes a pre heating step to drive off air and moisture from the prepared galvanized surface prior to powder coating.