Low PPGI Roofing Sheet Substrate Will be More Prone to Corrosion?

May 08, 2024

Myth:

Low PPGI Roofing Sheet Substrate Will be More Prone to Corrosion?
In metal activity, zinc is active metal, so it does not prevent acid corrosion.Zn+2HCl=ZnCl2+H2 The reaction of zinc and hydrochloric acid is redox reaction. Zinc as a reducing agent, HCl as an oxidizing agent, which is why in the return of halogenated board will be found in the bulge and the board surface of the water beads of the reason.
Analysis of the composition of the water droplets on the surface of magnesium glass, found that the main components of the water droplets are shown in the figure below

chemical composition	Cl -	Mg ++	K +	Na +
Concentration(g/L)	40.13	13.73	12.24	4.16

Opposing point of view:

zinc plating after the final formation of zinc oxide or zinc hydroxide on the surface, zinc plating is very fine, the formation of a protective layer, so there is a role in corrosion prevention, otherwise what is the role of zinc plating?

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