What is the general amount of zinc in steel deck

Steel decks are increasingly being used in various types of buildings, and it has been noticed that there is a shiny galvanized layer on the surface of the steel deck, so what is the role of galvanization?

The role of galvanizing steel deck

The galvanized coating of the steel deck mainly plays the role of anti-corrosion. The principle of galvanized coating anti-corrosion is the cathode theory of sacrificial anode protection in electrochemistry. When the material receives corrosion, sacrifice the strong reducing “cathode” – zinc, so as to protect the weaker reducing “anode” – steel, so as to ensure that in the oxidation process, as the force material steel is not subject to oxidation.

Different galvanizing amounts for different roles of steel deck

In the floor, according to the different roles of the steel deck, it is divided into the Composite floor and non-Composite floor; and the corresponding steel deck is divided into: steel floor deck and steel form deck.According to the specification requirements, regardless of the composite floor and non-composite floor steel deck should be hot-dip galvanized, not to The use of electric galvanized sheet.The total content of its double-sided galvanized layer should meet the requirements of no embroidery damage during use, and it is recommended to use 120-275 g/m².

When used as a non-composite deck, the content of the galvanized layer of the steel form deck can be lower, when used as a composite deck the content of the galvanized layer should not be lower than 150 g/m². When used as a laminate, the steel floor deck galvanized content should not be less than 150 g/m2. When used as a laminate and in relatively harsh environments, the steel floor deck galvanized content should be at the upper limit or higher.

If steel floor decks or steel form decks require a higher amount of galvanization, such as double-sided galvanizing amount of 300 g/m², 350 g/m² or aluminized zinc (5% aluminum) 275 g/m², 300 g/m², etc. The higher coating amount makes the composite floor longer Durability, the anti-corrosion ability of the same amount of aluminized zinc is about twice that of ordinary hot-dip galvanized.