中文版Paint
The paint is one organic coatings, mainly uses in protecting the metal parts, the equipment and the structure resists corrosion of the air, is uses for to take is protected between the metal and the environment the impediment. Prevents the metal with the paint the corrosion to have the glorious history, is also one kind of application Guang Jizui the common corrosion prevention technology, the construction is convenient, the cost is inexpensive.
Paint coating effective life, decided that the durability and the coating regarding is protected in the paint itself adhesiveness of the metal, but paint suitable application to obtain permanent adhesion and the best protective function the main method. Demonstrated based on the experiment that affects a paint life most important factor is the metal surface wants suitable processing, must not have the dust, the oil, the fat, the rust, the oxide compound metal of surface by the processing and any corrodes the material at first and so on. This factor is also more important than paint's quality, the quality bad paint uses on the surface treatment good metal the paint which is better than the quality uses on the surface treatment bad metal must be good. After metal surface all dunghills, grease stains and fat available resolver either alkazid solution elimination, again laundering, rust and oxide compound available acid pickling or sand blasting way elimination.
After metal surface clean clean, the undercoat paint should spread on immediately the dry surface, achieves the good adsorption, should better spread phosphate to spread the first paint again first. The paint usually must Tu Shu say that number of times and the type the coating, to achieve the suitable rust inhibition the important attribute. In paint process, coating of great importance primer, use for supplies metal basic adhesiveness, generally must spread two rust prevention primer and finish together. Some researchers thought the steel storm fog in corrodes under the environment, wants on four paints and thickness at least do not be smaller than 0.l3mm, the Taiwan Telegraphic Transmission Nuclear power plant is three primer, two finish coats, Formosa Plastics Group Mai Liaochang is three primer, finishes together. To guard against rust the primer promising red lead paint and the rich zinc coating two kinds commonly used, the red lead paint is (lead monoxide) modulates the red lead with each kind of paint base becomes, the rich zinc coating is the material (cementing agent) mixes by the massive zinc powder and few Cheng Mo becomes, after drying varnish, the zinc powder occupies the major part (approximately above 90%). In the red lead paint's lead monoxide ion pair metal corrosion has the inhibitory action, can therefore guard against rust. But the rich zinc coating is depends upon the zinc to of cathodic protection function the metal, therefore has the good rust prevention performance.
To prevent the metal corrosion the finish coat to have the epoxy resin varnish, the silicones paint, the ethylene chloride resin varnish, the melamine resin varnish, the hydroxy-acid resin varnish commonly used and so on, belongs to the epoxy resin varnish class the epoxy coal tar bitumastic enamel, is at present internationally high efficiency of anticorrosive paint the most widespread use, its adhesiveness, ruggedness, the water resistance, bear the chemical etching and so on to compare other coatings to be outstanding.
Ceramic protective film
The ceramic protective film is the ceramic material executes in the metal surface increases it to resistance and the thermal stability the high-temperature oxidation, all corrosion environment all has regarding outside the alkalis and the hydrofluoric acid good, but the putrescence, and has wear-resisting, easy clean, good-looking merits and so on outward appearance and good insulating property. The ceramics are refer to the metal oxide compound, the carbide, the boride, the silicide and the nitride general name, has the melting point to be high, degree of hardness is high, performance crisp and so on characteristics, what at present applies are many are the oxide compound and the carbide, also few application boride and silicide.
The suitable use metallizing method of ceramic material particle the molten state, will spurt is attached to the metal surface to form the cover coating, namely ceramic protective film. The membrane is called the enamelware or the enamel generally thick in 0.4 millimeter, above 0.4 millimeter is called the glass lining generally. Spurts the ceramic to be suitable under the high temperature uses, spurts the ceramic level to be possible to prevent the metal and the alloy intergranular corrosion, takes the caustic gas the isolation barrier, reduces opportunity which the hot spot occurs, may replace the low-alloy metal regarding the important spot, and may resist the pollutant the corrosion. If uses soaks plates the law, then must after the dryness dries out again in the stove forms the adhesion good protector.
Taiwan galvanization company in beginning of this year introduction named RUSPERT compound porcelain membrane production technology, applies specially in the screw and buckles rust prevention processing. This compound porcelain membrane by the metal zinc level (first), the phosphate epithelium (second) and the ceramic surface agglutination level (third) is composed, membrane thick approximately 10, it is said that has under the severe environment remarkable guards against rust the anti-eclipse and heat-resisting and so on performance, right now (Saint wields) by the Island of Taiwan Field Ceramics Company to the field promotion.
Conclusion
Knowledge of the metal corrosion prevention technology is widespread, the content is very rich, regarding screw's corrosion phenomenon, can actually use that kind of corrosion prevention measure, cannot be generally spoken. For example the corrosion prevention expense surpasses the cost which far the screw purchases, or replaces the new screw to be more economical directly, whether to have needs specially, must uses screw of the best corrosion prevention effect not to be possible. Wants proper to select the material quality and the surface treatment way cautiously, like the stainless steel, the alloy steel, the carbon steel or the galvanized screw and so on, all should in beforehand the distribution consideration, otherwise makes remedial treatments again afterward and so on corrosion prevention, is more difficult, and the effect is not clear. Even so long as will create the corrosion the environment isolation, then can the active control corrode, like of set the Taiwan Telegraphic Transmission Nuclear power plant will all construct workshop in the seal. Also some people use one kind of screw special-purpose revertex hat (for example RADOLID), has each kind of size, may expose screw or the cap nut close cover the atmospheric achieves the corrosion prevention effect. Moreover must avoid the different metallic material as far as possible by the screw union, otherwise the screw is very easy, therefore difference of the two material electrification potential energy creates the serious corrosion. Must therefore corrode based on the screw the reason, the environmental condition, the corrosion prevention request, each measure corrosion prevention effect, and factor synthesis consideration and so on cost and economic efficiency, decided that the most economical effective corrosion prevention measure, achieves the corrosion prevention the goal.
