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The Research of Preparation and Mechanism on New Non-chromium Dacromet Anti-corrosion Coating

Author: WangQuanQuan
Tutor: KeChangMei
School: Wuhan University of Science and Technology
Course: Chemical processes
Keywords: Chromium Dacromet Coating Corrosion resistance Mechanism
CLC: TG174.4
Type: Master's thesis
Year: 2010
Downloads: 166
Quote: 1
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Abstract


With the increasing awareness of global environmental protection , Dacromet contain high carcinogenic hexavalent chromium is more and more restricted . Chrome-free Dacromet With its excellent corrosion resistance , good adhesion , no hydrogen embrittlement, no pollution , a very wide range of applications . The focus of this research is chrome Dacromet coating solution preparation and coating the corrosion mechanism . The main component of the coating solution and content on the properties of the coating to determine the best formulation of the coating solution ; operating conditions on coating performance , determine the optimum conditions for coating prepared ; through scanning electron microscopy , energy dispersive analysis , made ​​a preliminary study of the X - diffraction analysis of the formation mechanism of the coating and the corrosion mechanism . The major findings are as follows : (1) the metal powder used in this study was a zinc aluminum powder, scaly determine zinc aluminum powder ratio of 5:1, the good appearance of the coating , corrosion resistance is strong . (2) Experimental first urethane-modified epoxy resin as binder , a polyamide resin as a curing agent . When the ratio between the urethane modified epoxy resin and polyamide resin 1.0:1.0 , the binding force of the coating and corrosion resistance has been significantly improved . (3) taking into account the solubility of the resin and baking curing solvent completely volatilized organic solvent chosen xylene with n-butanol and its ratio is 7:3 . (4) Taking into account the wettability and dispersion of the metal powder in the coating solution , organic wetting agents chosen butyl acetate . ( 5 ) to the main group in the coating solution is divided into factors designed orthogonal experiment , with the appearance of the coating adhesion and corrosion resistance as the evaluation index , the best formulation of the coating solution is determined by considering all aspects of performance . (6) through the single factor experiment to determine the coating operation conditions: drying temperature of 100 to 120 ° C , the drying time of 30 min , the curing temperature of 230 ° C , curing time 25 to 30min . ( 7 ) experimental preparation chromium Dacromet silver-white , uniform surface , smooth , resistant to ammonium nitrate time reached 230 min , resistant to salt spray test up to 1200h no rust , binding force , completely chrome-free and environmentally friendly requirements. ( 8) by means of scanning electron microscopy , energy dispersive analysis and XRD chrome-free Dacromet for the first time to conduct a comprehensive analysis , preliminary exploration of the film formation mechanism and the corrosion mechanism . Speculated that the corrosion mechanism is the shielding effect of the electrochemical action and inactivation .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metal corrosion protection,metal surface treatment > Corrosion control and protection > Metal surface protection technology
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