Study On The Environment-friendly Water-based Antirust Liquid

In2013, the production of crude steel reached to7.79tons in China, which is48.5%ofthe crude steel production in the world. Every year, however, due to the corrosion of steelproducts in our country is about10,000,000tons, Therefore, the development of theenvironmental and efficient iron rust products is very important. In the numerous antirustproducts, the environment-friendly water-based antirust liquid is widely concerned as its manyadvantages, for instance, it could take the place of flammable solvent oil.Using single factor screening to select the main inhibitors in sebacic acid, eleven-carbondicarboxylic acid, twelve carbon dicarboxylic acid, L190and all kinds of additives TJ-1, D-Sodium gluconate, RH-25-1, HEDP, EDTA-2Na,7610and7550antifoaming. The resultsshowed that sebacic acid and eleven-carbon dicarboxylic acid have the best single anti rust. Onthe role of promoting agent are TJ-1, D-Sodium gluconate, RH-25-1, EDTA-2Na,7610antifoaming. Then, to determine the optimum amount of each component in working fluid byorthogonal experiment method, and then to determine the best optimum proportion of theconcentrated water-based anti rust liquid, and the various physicochemical properties weredetected.The orthogonal experimental method was adopted to determine the optimal reaction massratio of the main inhibitor including sebacic acid, eleven-carbon dicarboxylic acid, boric acid,monoethanolamine, triethanolamine, then to determine the optimal concentration of the maininhibitor through the single factor experiment. The orthogonal experimental method wasadopted to determine the optimal mass ratio of D-Sodium gluconate, urotropine, urea. Thesingle factor experiment was adopted to determine the optimum dosage of TJ-1, RH-25-1,EDTA-2Na,7610, and then to determine the optimal formula of water-based antirustconcentrated liquid. In addition, the physicochemical properties were detected. The resultsshowed that the compound environment-friendly water-based antirust liquid concentratedSGD-1is the light yellow and transparent liquid. The formula composition is the mass ratio ofsebacic acid: eleven-carbon dicarboxylic acid: monoethanolamine: triethanolamine0.5:0.5:1.6:0.8as the reaction product H140g, the mass ratio of D-Sodium gluconate:urotropine: urea0.1:10:10as the mixture H216.08g, TJ-16g, EDTA-2Na0.12g,76100.12g,deionized water37.56g. Anti rust property test results showed that the rust grades of5wt.%SGD-1standarddetection of monolithic, lamination and hanging pieces were grade0(no rust anddiscoloration). Typical inventory environment hanging pieces test, hot rolled steel plate, coldrolled steel plate, cast iron HT300antirust period can reach to120h. The antirust period of threekinds of plates hanging indoor can reach to2months. In the dynamic heat test, antirust period ofhot rolled steel plate and cold rolled steel plate can reach to96h, antirust period of cast iron HT300is18h.The film forming test results showed that hot rolled steel plate, cold rolled steel plate and castiron HT300are qualified through the improved method of blue point detection. The corrosioninhibitor layer evenly covers the basal body surface of the plates, and the basal body has no exposeddefects through the observation of scanning electron microscope. The membrane is complete anddense.The polarization curves showed that the normal temperature of SGD-1can make the threeplates appearing widely anodic passivation region. Thecorrosion current is smaller than the blanksolution and the inhibition efficiency is average up to87%. In addition, the polarization curvesshowed that the SGD-1antirust performance at room temperature is better than that of SGD-1during heating.The SGD-1implements the normal atmospheric temperature using, and makes the hot rolledsteel plate, cold rolled steel plate, cast iron HT300at high temperature and high humidityenvironment performing excellent anti rust properties, which is a water-based products of non-toxic,environment-friendly and alternative solvent antirust oil.