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Application of novel sol-gel composites on magnesium alloy

Journal of Magnesium and Alloys 2019年第3期7卷 419-432页

作者： S.Nezamdoust D.Seifzadeh z.rajabalizadeh Physical Chemistry Research Laboratory Applied Chemistry DepartmentFaculty of ScienceUniversity of Mohaghegh ArdabiliArdabilIran

Application o f defect-free,adherent,and corrosion protective sol-gel film on the magnesium alloys is generally *** this study,two novel sol-gel/conversion coating composites were successfully deposited on AM60B magnesium alloy in order to provide sufficient protection against the *** first composite(Ti-zr/hybrid)was obtained via combination o f a hybrid sol-gel film(synthesized by mixing tetraethoxysilane(TEOS),and 3-glycidyloxypropyl-trimethoxysilane(GPTMS))as outer layer and Ti-zr conversion coating as ***,the second composite(Ti-zr/PTMS)was applied in a similar manner by combination o f phenyl-trimethoxysilane(PTMS)so lgel film with the Ti-zr conversion *** morphology and elemental composition of the Ti-zr conversion film were assessed by the Scanning Electron Microscopy(SEM)and Energy Dispersive X-ray Spectroscopy(EDS),respectively.A cracky conversion film was applied on the alloy surface after immersion in the Ti-zr conversion coating bath which was mainly composed of MgO,T i02,zr02,and MgF2 ***,but not-adherent PTMS and hybrid sol-gel films(pure sol-gel films)with obvious defects were directly deposited onto the magnesium alloy without the Ti-zr pretreatment which were morphologically characterized by the ***,formation o f relatively uniform and completely defect-free Ti-zr/hybrid and Ti-zr/PTMS composites after using the Ti-zr conversion coating as pretreatment was revealed by the SEM *** addition,the defects of the Ti-zr conversion coating were completely filled by the sol-gel *** Ti-zr/PTMS and Ti-zr/hybrid composite coatings were provided much better corrosion protection capacity than the pure PTMS and hybrid sol-gel films,respectively which was confirmed by the Electrochemical Impedance Spectroscopy(EIS)and Potentiodynamic Polarization(PDP)examinations in 0.05 M NaCl solution.

关键词： Sol-gel Composite Magnesium alloy Corrosion

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Online evaluation of electroless deposition rate by electrochemical noise method

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Transactions of Nonferrous Metals Society of China 2019年第8期29卷 1753-1762页

作者： z.rajabalizadeh D.SEIFzADEH A.HABIBI-YANGJEH Applied Chemistry Department Faculty of Basic Science University of Mohaghegh Ardabili

Continuous noise resistance calculation(CNRC)technique was used for online determination of the electroless nickel deposition rate on zirconium pretreated magnesium *** this purpose,the noise resistance(R_n) variation with time was calculated for the pretreated alloy surface in the electroless plating *** CNRC results were described by energy dispersive X-ray spectroscopy(EDS)and scanning electron microscopy(SEM)***,potentiodynamic polarization and gravimetric measurements were used for determination of the electroless deposition rate at the same time period and the results were compared with the CNRC *** Rn variation with plating time shows that the electroless plating consists of different stages with various deposition *** results of the CNRC and polarization methods were not in acceptable agreement due to the limitations of the polarization method for online monitoring of the deposition ***,the results of the gravimetric measurements were in complete agreement with the CNRC technique and so,the CNRC can be considered as suitable tool for online evaluation of the electroless deposition rate.

关键词： magnesium alloy electroless plating deposition rate electrochemical noise SEM EDS

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Corrosion protection and mechanical properties of the electroless Ni-P-MOF nanocomposite coating on AM60B magnesium alloy

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Journal of Magnesium and Alloys 2022年第8期10卷 2280-2295页

作者： z.rajabalizadeh D.Seifzadeh A.Khodayari Sh.Sohrabnezhad Applied Chemistry Department University of Mohaghegh ArdabiliArdabil ***Iran Department of Chemistry Faculty of ScienceUniversity of GuilanP.O.Box 1914RashtIran

Al-based MIL-53 MOF nanostructure was synthesized hydrothermally and then co-deposited in the electroless nickel coating on AM60B magnesium alloy using zr pretreatment as an eco-friendly *** MIL-53(Al)nanostructure was synthesized in the form of layered semi-cube crystals with the surface area and mean pore diameter of 985.72 m^(2)g^(-1) and 2.00 nm,*** SEM images captured with two various zooming scales from the surface of the plain and MOF containing electroless layers showed cauliflower-like morphology with even distribution of nodule ***,the sub-grains of the plain coating disappeared after incorporation of the ***,both the normal and nanostructure-containing electroless layers have crystalline-amorphous structure,but the nanocomposite coating showed less *** average surface roughness of the plain electroless coating was about 309 nm,which decreased to about 222 nm after incorporation of the *** XRD patterns showed that the characteristic peak of Ni broadened after incorporation of the MOF,probably due to the decreasing of the *** the heat-treated normal and MOF containing coatings at 200℃ no phase transition takes place,but new peaks appeared for heat-treated coatings at 400℃ due to the crystallization and second-phase *** results of the EIS tests showed an increase in the amount of the charge transfer resistance(from 19 to 29 kΩcm^(2))after addition of the MOF,which means an improvement in the corrosion ***,low Jcorrof the composite coating represents its higher corrosion resistance with respect to the plain *** micro-hardness values of the composite coating before and after the heat treatment were higher than the plain ***,the Ni-P-MOF coating has a lower wear rate both before and after the heat treatment due to an improvement in its micro-hardness.

关键词： Electroless plating MOF Magnesium alloy Wear EIS

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