Standard and parameters of zinc steel guardrail

The base material of the zinc steel balcony guardrail consists of six layers, which are:

(1) Base steel: base material, hardness value of 159 DPN;

(2) Zeta steel layer: a dense alloy layer closest to the substrate, complex structure, strong corrosion resistance, combined with FeZn7 and FeZn13, hardness value of 211 DPN, containing Fe 7% - 11%;

(3) Delta layer (Delta layer): significantly monoclinic columnar structure, Fe content of 6%, non-toxic, corrosion-resistant, hardness value of 179 DPN;

(4) Eta layer: dense hexagonal crystal system, deformation processing is not easy to break, zinc purity is 98.5%, hardness value is 70DPN;

(5) High zinc phosphating layer: has good corrosion resistance and enhances the adhesion of the coating film to the substrate;

(6) Color-free molecular high-temperature curing layer: excellent anti-corrosion performance and impact resistance, excellent anti-ultraviolet, anti-oxidation and surface self-cleaning performance, the color change rate is less than 5% in 15 years.