National Engineering Laboratory for Advanced Coatings Technology of Metal Material

Beijing, China

National Engineering Laboratory for Advanced Coatings Technology of Metal Material

Beijing, China

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Lu Q.,Control Iron and Steel Research Institute, China | Lu Q.,National Engineering Laboratory for Advanced Coatings Technology of Metal Material | Wang L.-D.,Dalian University of Technology | Liu G.-C.,Dalian University of Technology | And 2 more authors.
Chinese Rare Earths | Year: 2014

This paper indicates the optimum techniques parameters of rare earth cerium conversion coating on the aluminum silicon alloy surface by orthogonal as follows: Ce(NO3)3: 14g/ L; KMnO4: 1.5 g/ L; K2S2O8: 1.0 g/ L; NaF: 0.8 g/ L; pH value of solution: 2.0, immersing 60 min at room temperature. Results of the SEM, EDS and XRD show that Ce-Mn conversion coating, which is close to the matrix, is composed of a matrix film and particles of different sizes adhesive on the film; the coating thickness is about 10 ~ 5 μm, consisting essentially of oxide or hydroxide of Ce and Mn. The coating is amorphous structure, with the same direction, can inhibit the generation of micro-battery electrolyte. The polarization curve, electrochemical impedance spectroscope (EIS) and soak test results have the following findings: 1) the Ce-Mn conversion coating corrosion potential increases 210 mV; 2) the corrosion current density decreases to 1/10 compared with the previous; 3) it has higher layer resistance and charge transfer resistance, the lower layer capacitor and electric double layer capacitor, higher dielectric constant. Ce-Mn conversion coating is more compact and has less surface defect and uniformly covers the surface of aluminum silicon alloy. It has a good protective effect on flue gas condensate.


Gu B.-S.,Control Iron and Steel Research Institute, China | Gu B.-S.,National Engineering Laboratory for Advanced Coatings Technology of Metal Material | Yi H.-L.,Control Iron and Steel Research Institute, China | Yi H.-L.,National Engineering Laboratory for Advanced Coatings Technology of Metal Material | And 10 more authors.
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2013

In order to study the curing process of chromium-free non-oriented silicon steel coatings, phosphatic chromium-free non-oriented silicon steel insulating coating was prepared and TG-DSC analysis of the coating was conducted, then the change of the actual temperature of the coated non-oriented silicon steel sheet with time at different curing temperatures was studied. Based on the experiments, the processing curves of curing temperature vs. curing time (T-t) for the chromium-free non-oriented silicon steel coatings were obtained. Salt spray experiment, potentiodynamic polarization, electrochemical impedance spectroscopy, adhesion testing and SEM, EDS were used to examine properties of the coatings. The results show that the coatings withe dense structure and excellent performance can be obtained based on the processing curves of curing temperature vs. curing time (T-t).


Yi H.,Control Iron and Steel Research Institute, China | Yi H.,National Engineering Laboratory for Advanced Coatings Technology of Metal Material | Gu B.,Control Iron and Steel Research Institute, China | Gu B.,National Engineering Laboratory for Advanced Coatings Technology of Metal Material | And 6 more authors.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2013

Influence of boric acid on the performance of chromium-free non-oriented silicon steel insulating coating based on aluminum dihydrogen phosphate was investigated. Salt spray experiment, potentiodynamic polarization and electrochemical impedance spectroscopy were used to study the influence of boric acid content on the corrosion resistance and electrochemical behavior of the insulation coating of silicon steel. Surface morphologies of the coatings were tested by SEM. Result shows that when the boric acid content is 9.7%, the coating has the best corrosion resistance and electrochemical performance.


Yi H.-L.,Control Iron and Steel Research Institute, China | Yi H.-L.,National Engineering Laboratory for Advanced Coatings Technology of Metal Material | Gu B.-S.,Control Iron and Steel Research Institute, China | Gu B.-S.,National Engineering Laboratory for Advanced Coatings Technology of Metal Material | And 6 more authors.
Cailiao Kexue yu Gongyi/Material Science and Technology | Year: 2013

This paper studies the influence of zinc oxide on the performance of chromium-free non-oriented silicon steel insulating coating which based on aluminum dihydrogen phosphate. Salt spray experiment and potentiodynamic polarization were used to study the influence of zinc oxide content on the corrosion resistance and electrochemical behavior of the insulation coating of silicon steel. The surface morphology and adhesion of coating were tested by SEM and stereo microscope. The results show that when the zinc oxide content is 4.0%, the free phosphoric acid in the coating surface can be completely neutralized by zinc oxide and the coating has best corrosion resistance and adhesion; when zinc oxide content is too low or too high, the coating has poor corrosion resistance and adhersion.


Gu B.-S.,Control Iron and Steel Research Institute, China | Gu B.-S.,National Engineering Laboratory for Advanced Coatings Technology of Metal Material | Ge H.-L.,Control Iron and Steel Research Institute, China | Ge H.-L.,National Engineering Laboratory for Advanced Coatings Technology of Metal Material | And 4 more authors.
Cailiao Kexue yu Gongyi/Material Science and Technology | Year: 2013

This paper studies the influence of acrylic resin on the performance of insulating coating of aluminum dihydrogen phosphate on chromium-free non-oriented silicon steel. Salt spray experiment, potentiodynamic polarization and electrochemical impedance spectroscopy were used to study the influence of acrylic resin content on the salt spray resistance and electrochemical behavior of the insulation coating of non-oriented silicon steel. The surface morphologys and adhesion of coating were tested by SEM. Result shows that when the acrylic resin content are 19.9~29.4%, the coatings have best corrosion resistance and adhesion; when the acrylic resin content is too high, the coating has poor corrosion resistance and adhesion.

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