by Before painting steel members, the metal surface shall be strictly subject to sand blasting and rust prevention treatment, and the durability life of anti-corrosion coating shall not be less than 15 years.
Many people always have doubts about the selection of inorganic zinc rich and epoxy zinc rich primers.
What kind of paint is good? Inorganic zinc rich paint is superior to epoxy zinc rich paint in heat resistance, solvent resistance, chemical resistance and electrostatic conductivity, and the flexibility and construction performance of paint film are poor.
Inorganic zinc rich paint has some special requirements in construction, such as its curing depends on high relative humidity, surface porosity, fog spraying technology, etc., while the construction requirements of epoxy zinc rich paint are much simpler.
Comparison table of advantages and disadvantages of epoxy zinc rich primer and inorganic zinc rich primer in construction comparison project epoxy zinc rich primer inorganic zinc rich primer curing environment low relative humidity has no impact on curing.
It requires high relative humidity to cure and stir.
The construction is simple, continuous stirring is not required, continuous stirring is required, recoating performance is easy, and there is no need to close the pores on the primer surface, It will lead to pinholes and bubbles in the subsequent coat of paint.
The special spraying technique of fog spraying / / unified spraying needs to be adopted.
The recoating time is 1.5 hours.
It takes a long time to determine whether the intermediate paint can be constructed after curing test (MEK).
The damaged area is easy to repair, is sensitive to poor surface treatment, and the damaged part is easy to layer.
The performance of the paint film is less brittle than the inorganic zinc rich primer, Good flexibility, brittle paint film, poor flexibility, low requirements for steel surface treatment, at least SA2 5 or SSPC-SP6 application scope is mainly used in urban pipeline anti-corrosion, internal and external anti-corrosion of buried pipeline, joint coating, elbow, anti-corrosion overhaul of buried pipeline and other heavy anti-corrosion fields.
It can be used for oil tanks, oil tanks, solvent tanks, ballast tanks and marine steel structures, stadiums, bridges and chimneys with harsh environment and conditions.
It can also be used as anti rust and heat-resistant coatings.
In conclusion, inorganic zinc rich is required to be cured by water vapor.
The recoating interval is very long at room temperature.
The post coating can only be applied after curing test, And special spray technology is required; The epoxy zinc rich primer can recoat the intermediate paint in only 1.5 hours.
The conventional construction has high efficiency and can greatly shorten the tense construction period.
For construction, of course, epoxy zinc rich is easier to use than inorganic zinc rich.
It not only has low requirements for surface treatment, but also has short recoating time and good adhesion.
Even if the surface treatment is not in place, there will be no problems in a short time.
For the performance of paint film, inorganic zinc rich has high hardness and brittleness, so it is not suitable for thin-walled steel structure, but it is very suitable for large steel structure, because the deformation of large steel structure is not large, and inorganic zinc rich has high hardness, so it is not easy to be damaged after curing; For salt spray resistance, inorganic zinc rich is much higher than epoxy zinc rich.
Especially in seawater, the performance of single-layer inorganic zinc rich is very excellent, which can fully achieve long-term anti-corrosion.
Inorganic zinc rich coating is difficult to fake, so as long as it is strictly done, if the inorganic zinc rich coating is done well, the performance of the coating will be very good; The epoxy zinc rich primer is too easy to fake, and the problem can not be seen in a short time, resulting in a flood of low zinc epoxy zinc rich primers in the market.
Conclusion: considering the performance and service life, the first choice is inorganic zinc rich primer.
From the perspective of construction, the construction of epoxy zinc rich primer is simple.
Specifications involved: zinc rich primer Hg / t3668-2009..
