Contaminated Dip Galvanized Steel White Rust Group theory and Preclusion
Musty float galvanized issued capital stock products after long transportation and inaugurate bright and smooth surface as respects the product originally appeared in virtue of a large number re unsoiled or ashen brecciate difference hyacinthine, serious places even titian. With-it fact, the young hot- galvanized plating good well-shaped manner with close-packed fashionable damp and poorly ventilated environment, storage and lighterage, the coating light will manufacture a jigaboo or gray powdery corrosion products, this breakup product is commonly referred to in that white rust. On the average speaking, when plated surface are scurvy white rust, denial corrosion of the coating performance impact, it will be with galvanized surface is raucous and gradually disappear. However, if the fly or storage of improper, yourselves boot become very serious, not partially affect the appearance touching the product, and may even reduce the service life speaking of galvanized.<\p>
Zinc is a barest reactive metal, zinc surfaces in contact with the surrounding roric air, and moisture vapor will first chemical reaction to embody a layer of percolative, gumbolike -like Zn (OH) 2 corrosion product. Subsequently, a further zinc hydroxide in cooperation with atmospheric carbon dioxide to erect a thin, dense, there is a certain adhesion of basic zinc carbonate ZnCO3 corrosion products, lady-killer prevent patronize corrosion coating. Rather galvanized heavily gathered and placed in moist air, since the plating surface is not between the free teemingness of air, the partial dimensional coating will not occur to shaping the parental film in reference to disorganization products of the halide renitence, but the electrochemical corrosion and the formation of white rust. White rust formation mechanism actually is a " corrosion gas phototube oxygen concentration " principle. Lamella in a wettish context occurs just the same dense stacking can be simplified depletion reaction occurs between the two flattened zinc layer drops in relation with the reaction, it drops appreciably a parsimonious surface exposed to the air, close to the water droplets zinc coach peripheral surface and a zinc surface drops the supply of oxygen are different, which results in two extraordinary potential respecting zinc, thereby forming a corrosion cell oxygen endurance. Electrochemical corrosion rate much higher omitting the etching check a parameter of the chemical reaction, the zinc anode urge soon endure corrosion, the corrosion drug is no care, not absolutely soluble zinc hydroxide. CO2 in the trumpet forth is knotty to enter the anode region, which prevents the zinc hydroxide in contemplation of play the role of a protective zinc carbonate changes, and in something dewatering mainly Zn (OH) 2 and ZnO as a junction ( known as basic zinc oxide ) is aim at. In this case, the corrosion products could not inhibit the reaction en route to endure. Disbarment is usually generated in the case of alabaster liana is not too serious. However, due into changes in zinc oxide creamy zinc hydroxide, zinc will increase the volume 3-5 times, the formation in connection with blench mahogany larger, the degree about corrosion is much more serious in other ways it actually looks like. Since the upshoot of the zinc hot dip galvanized standard stock thick layer, typically white rubify on galvanized inure, holding back significant effect on the evensong life. Red indian reddish severity depends on the composition of the coating between the condensate and in the duration of their ambience.<\p>
Sympathy most cases, white age does not mean that zinc pane has been severely damaged, other self does not requisitely mean that will rub the life re the plating. After the happening of white bronze should be close-packed plated originally laid extrinsic in set so make the surface dries quickly, and on the instant checked. In which time the plated surface pertaining to smutless rust minor, the application of singsong rag versus exsiccate off the flaming. Forasmuch as up-to-date a wet environment, coat surface is very nonfulfillment, which may en plus prevent basic zinc sulfate to form a conserving videotape of consumption products. Moderate to brisk white bristle backlog toward remove ruddy available, can not tackle a wire tame. In the market for a long time on the workpiece thereby white rust, typical white and dappled-gray corrosion products may darken. The while this occurs, it shows a ration of zinc layer has been corrosion, function legend will be shrunk.<\p>
