anti-rust paint with non-toxic paint Research Progress

 Metals and their alloys applications throughout all areas of the national

economy. According to statistics, the global annual metal loss due to

corrosion caused by the  tin stabilizer annual metal production capacity of up to 20% to

40%, about earthquakes, floods, typhoons and other natural disasters, the

sum of six times, resulting in huge economic losses. Meanwhile metal

corrosion damage of equipment and facilities will also affect the stability

of production and disrupt people's lives in order and even lead to

accidents resulting in personal injury. Therefore, the metal corrosion is

very important [1-3]. Organic coatings against corrosion has become by far

the most effective, most economical and most common method [4], with

excellent performance, ease of manufacture, low price and a number of other

methods can not match advantage. And more attention to environmental

protection today, the development of new anti-rust paint environmental

pollution became one of the trends [5,6].
Anti-rust paint anti-rust paint varieties and dosage, as well as with

anti-rust paint binder resin interactions occurring protective properties

of the coating greatly affected [7]. The traditional use of the anti-rust

paint coatings containing more chromium, lead, cadmium and other pigments

such as red lead, lead oxide, and  dibutyl phthalate zinc, barium, lead chromate, with its

mixture of the coating while having good anti-corrosion , but in itself

toxic, and in the production and use of the process will pollute the

environment and health hazards, many countries have strict restrictions on

the use [8]. Therefore, the development of non-toxic anti-rust paint and

coatings efficiently has become imperative. Researchers at home and abroad

have developed a phosphates, molybdates, borates and flake pigments and

other non-toxic and efficient anti-rust paint .
This article describes a variety of non-toxic anti-rust paint corrosion

mechanism and application progress, according to their mechanism of action

divided into: ① physical rust paint; ② chemical rust paint; ③ both

physical and chemical mechanisms of the integrated anti-rust rust-

preventive pigment.
A physical anti-rust paint
 Physical rust pigment itself more stable chemical properties, its anti

-rust pigment itself instead of relying on the mechanism of chemical

activity, but they have to rely on physical properties. Conventional non-

toxic physical rust red iron oxide pigments, mica iron oxide, mica, glass

flake, stainless steel scales, such as aluminum and aluminum paste.
1.1 Iron oxide red
Short red iron oxide red, formula Fe2O3, its crystalline phase with α

-Fe2O3 (used as pigments) and γ-Fe2O3 (used as a magnetic material), and

its crystal structure due to different methods of synthesis, there are

cubic, spherical, needle like type, hexagonal, diamond-and hexagonal

platelets. Red iron oxide is not soluble in water, alkali and acid, only in

the case of heating to dissolve in concentrated acid, insoluble in an

organic solvent and an organic base material, high heat resistance, α-

Fe2O3 general heat resistance up to 1200 ℃. Iron oxide red pigments are

inert, iron oxide pigments in the aluminum hydroxide  most stable, with good weather

resistance, light, water, and the role of the atmosphere is stable, and can

strongly absorb ultraviolet radiation, leaving the protected goods from red

iron UV damage. For rust in the system is based on its dense coating of the

items covered by the shielding effect from physics [13,14], while iron red

rust on the substrate have the ability, the ability of polluted gases,

alkali, coloring force, hiding power. Due to low prices, is used widely in

rust, but the rust resistance 1.2 micaceous iron oxide
Micaceous iron oxide, the main chemical ingredient of α-Fe2O3, is

hexagonal single crystal flake, mica flake as having similar structures, so

called micaceous iron oxide. Its chemical stability, non-toxic and

tasteless, high temperature, UV, also has anti-chalking, rust resistance,

alkali resistance, salt spray resistance, weather resistance and excellent

performance [15].
MIO MIO divided into natural and synthetic micaceous iron oxide two kinds.

Natural micaceous iron oxide is made from natural minerals (eg iron ore)

crushing, sorting, crushing derived, heat resistance up to 800 ℃ or more,

contain more impurities, particle size distribution is uneven. Most of the

world use natural micaceous iron oxide. The synthetic micaceous iron oxide

due to high purity, particle size distribution, with a sense of three-

dimensional sense of strong light, heat resistance is even higher than the

natural micaceous iron oxide