The primer in steel structure coating is mostly zinc-rich primer, among which the most used is “epoxy zinc-rich primer” and “inorganic zinc-rich primer”, so what is the difference between these two materials? In the corrosion prevention system of steel structure of multi-channel coating system, the performance of epoxy zinc rich primer is basically the same as that of inorganic zinc rich. In many cases, epoxy zinc rich primer can be used instead of inorganic zinc rich primer. From the perspective of construction and the construction speed, the epoxy zinc-rich primer is more appropriate. In terms of the performance of paint film, inorganic zinc rich primer has high hardness and large brittleness, so it is not suitable for thin-wall steel structure, but it is very suitable for large steel structure, because the deformation of large steel structure is not large. Moreover, inorganic zinc-rich primer has high hardness and is not easy to damage after curing. For salt spray resistance, inorganic zinc-rich primer is much higher than epoxy zinc-rich primer, especially in seawater, single layer inorganic zinc-rich primer has very excellent performance, which can achieve long-term anticorrosion completely.
Steel structure coating system includes surface treatment, spraying, testing, maintenance and other links to explain. Compare around these aspects.
Steel structure coating system includes surface treatment, spraying, testing, maintenance and other links to explain. Compare around these aspects.
Lower humidity has no effect on curing; inorganic zinc-rich primer: high relative humidity is required to cure, generally more than 65%.
Convenient construction, without continuous mixing; inorganic zinc-rich primer: need continuous mixing.
Easy to reapply, without sealing primer; inorganic zinc rich primer: porous surface, will lead to pinholes and bubbles of the rear paint, need to use fog spray, spray special spraying skills.
23℃, 1.5 hours; inorganic zinc-rich primer: for a long time, the curing test (MEK) is needed to determine whether the intermediate paint can be constructed.
Damaged areas are easy to repair; inorganic zinc-rich primer: very sensitive to poor surface treatment, damaged parts are easy to layer.
Small brittleness, good flexibility; inorganic zinc rich primer: paint film is brittle, poor flexibility.
In conclusion, the use of inorganic zinc-rich requires moisture curing, and the recoating interval is very long at room temperature, before curing test can be applied, and special fog spray technology is required; while epoxy zinc-rich primer can be recoated with intermediate paint in only 1.5 hours. Conventional construction, high efficiency, can greatly shorten the tight construction period.
For construction, of course, epoxy-rich zinc is better than inorganic zinc-rich, not only the surface treatment requirements are low, but also can recoating time is short, adhesion is good, even if the surface treatment is not in place, there will be no problem in a short time!
Epoxy zinc-rich primer and top coat matching is good, while inorganic zinc-rich primer is limited.1, there are more pores on the surface of the substrate, easy to bubble when coated paint, 2, the opposite paint alkaline resistance requirements, and inorganic zinc rich primer must be fully dry before the paint, otherwise the adhesion is poor, easy to peel off.
For the performance of paint film, inorganic rich zinc high hardness, brittleness, so it is not suitable for thin-wall steel structure, but very suitable for large steel structure, because the deformation of large steel structure is not large and inorganic zinc rich hardness is high, it is not easy to damage after curing;
For salt spray resistance, inorganic zinc rich higher than epoxy rich zinc, inorganic zinc rich primer because inorganic silicate binder reaction with zinc powder also with the matrix metal iron reaction, so its corrosion resistance, durability is better than epoxy zinc rich primer, the corresponding surface treatment requirements is higher than epoxy rich zinc, especially in seawater, a single layer of inorganic zinc rich performance is very excellent, can achieve long-term corrosion.
Inorganic zinc-rich coating film has better heat resistance, solvent resistance and electrical conductivity than epoxy zinc-rich primer. Inorganic zinc-rich is difficult to cheat, so as long as strictly done, the inorganic zinc-rich coating will be very good; epoxy zinc-rich primer is too easy to fake, and in a short time, resulting in the flood of low zinc epoxy zinc-rich primer on the market.
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