Epoxy iron red primer: a two-component anti-corrosion primer made of epoxy resin, anti-rust pigment, curing agent, etc. Epoxy zinc-rich primer: Epoxy zinc-rich primer is an anti-corrosion coating composed of epoxy resin and zinc powder as the main raw materials, thickeners, fillers, additives, solvents, etc.
1. The difference between epoxy iron red primer and epoxy zinc-rich primer is mainly the different anti-rust principle. The anti-corrosion principle of epoxy iron red primer: passivation and corrosion inhibition of iron red pigment.
The anticorrosion of epoxy iron red primer depends on the passivation and corrosion inhibition of iron red pigment on steel, and the effect of antirust pigment on metal surface to passivate or generate protective substances to improve the protection effect of coating. The corrosion inhibition effect can make up for the insufficient shielding effect of the paint, and in turn, the shielding effect can prevent the loss of corrosion inhibitor ions, so that the corrosion inhibition effect is stable and lasting.
2. Anticorrosion principle of epoxy zinc-rich primer: cathodic protection. If there are more active metal (metal with lower electrode potential) powders than steel in the paint coating, such as zinc powder or aluminum powder, they can form cathodic protection of the sacrificial anode for steel, similar to the principle of galvanizing, as long as these The content of active metal powder reaches the point of contact between the metal powder particles and between the metal powder and the steel substrate, so that the steel can be protected from corrosion. Zinc-rich coatings are typical of this type of functional coatings.
The difference of anticorrosion effect between epoxy zinc-rich primer and epoxy iron red primer
In terms of anti-corrosion effect, the effect of epoxy zinc-rich primer (national standard) is better. Generally, the anti-corrosion period of more than ten years requires epoxy zinc-rich primer, and for general anti-corrosion, epoxy iron red primer can be used. , and personally think that the non-national standard epoxy zinc-rich primer with too low zinc content is not as good as epoxy iron red primer, and if the zinc content is too low, it cannot play a cathodic protection effect.
Epoxy zinc-rich primer is used for anti-corrosion of steel structures under conditions that require long-term anti-corrosion and harsh corrosive environments, and for anti-corrosion of steel structures in moderate to severe corrosive environments.
Epoxy iron red primer is used for general anti-corrosion and general corrosive environment, mild or moderate corrosive environment steel surface anti-corrosion primer.
Epoxy zinc-rich primer has higher requirements on substrate treatment, and the requirement is Sa2.5 level or higher, and epoxy iron red primer has relatively low requirements on substrate treatment.
For the matching, the matching of the two is similar, both can be matched with epoxy micaceous iron intermediate paint/acrylic topcoat/polyurethane topcoat/fluorocarbon topcoat, etc. However, epoxy zinc-rich primer generally cannot be matched with alkyd topcoat.
In terms of price, the price of the national standard epoxy zinc-rich primer is high, the price of epoxy iron red primer is low, and the economical epoxy iron red primer is far better than the epoxy zinc-rich primer. Consider which primer to use depending on the situation.
Such as: major projects, port machinery, heavy machinery, oil storage tanks, and ships generally use epoxy zinc-rich primers, and steel structure workshops, equipment, construction machinery in mildly corrosive environments, and refurbishment projects after simple rust removal. Iron oxide red primer.
Of course, the service life also needs to be considered: if a port machinery is expected to be dismantled after 3 years of use, there is no need to use an epoxy zinc-rich primer.
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