Corrosion properties of Co-Mo and Co-Mo-P alloys
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SIDELINIKOVA, Svetlana; IAPONTSEVA, Iu.; VOLODINA, Galina. Corrosion properties of Co-Mo and Co-Mo-P alloys. In: Materials Science and Condensed Matter Physics. Editia a 7-a, 16-19 septembrie 2014, Chișinău. Chișinău, Republica Moldova: Institutul de Fizică Aplicată, 2014, p. 300.
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Materials Science and Condensed Matter Physics
Editia a 7-a, 2014
Conferința "Materials Science and Condensed Matter Physics"
Chișinău, Moldova, 16-19 septembrie 2014

Corrosion properties of Co-Mo and Co-Mo-P alloys


Pag. 300-300

Sidelinikova Svetlana1, Iapontseva Iu.2, Volodina Galina1
 
1 Institute of Applied Physics, Academy of Sciences of Moldova,
2 Vernadsky Institute of General and Inorganic Chemistry NAS Ukraine
 
Disponibil în IBN: 19 martie 2019


Rezumat

Pure molybdenum coating cannot be electrodeposited  from  aqueos  solutions it readly codeposits with iron, cobalt, nickel, forming an alloy. Alloy  electrodeposition  widly employed in the production  of new materials with   specific mechanical, chemical and phisical properties.  The indused codeposition molybdenum  with  cobalt to obtain metalic coatings with useful  properties, such as hardness, catalytic and magnetic properties [1]. Here were  examined  corrosion   resistence  Co-Mo and Co-Mo-P alloys electrodeposited   from solutions :    1.100 g/l CoSO4 ·7H2O, 20 g/l Na 2MoO4· 2H2 O, 35 g/l H 3C 6 H 5O7 , 35 g/l Na2E DTA,  pH = 4, t  =20o C. 2. 0, 6 mol /l CoSO4·7H2O, 0,3 mol / l H3C6H5O7·H2O, 0,02 mol. / l Na2MoO4 ·2H2O, 0,1mol /l NH4H2PO2 ·H2O, pH = 6, t =20 C.  The deposition occurred in the range of curent densities 2 –10 A/dm2.  Corrosion properties of  Co-Mo and Co-Mo-P alloys in neutral media  with cloride-iones (7 g/l Na2SO4 and 7 g/l NaCl) were  studied  by methods of electrochemical impedance spetroscopy and voltammetry using sistem AUTOLAB (GPSTAT 20 +FRA ) with program GPES  4,9 and FRA 4,9. Corrosion parameters  was found from analysis voltammetric curves and spectrums of electrochemical impedance. Morfology and alloys composition were studied by scanning electron microscope (TESCAN) with system for local chemical analysis (ICA Energy EDX).The structure of electrodeposits were studied by X –ray phase analysis with aplication of diffractometer (ДРОН –3) by Ø/2Ø method.  It was shown that curent density increases   from 2 to 10 A/dm2, content  of  molybdenum  in Co- Mo and Co -Mo –P alloys increase, but content of P decrease. The content of Mo in Co-Mo alloys are 6,9 – 12 at. % and in Co-Mo-P alloys – 3 –7,5 at. % and  at. % of P = 3,3 – 1,9.  Results of  X-ray diffractometry are shown the increase of texturing coatings obtained at curent density 5 – 10A/dm2 and it is very important  for corrosion characteristics of  Co-Mo and Co-Mo-P alloys.  It has been found to depend corrosion resistance of  testing simples from composition and structure. Corosion parameters of Co-Mo electrodeposited at 2  - 10 A/dm2 : Icor. = 2,6 – 20.2 ·10-5 A, Ecor. = -0,653 –0,786 V, Rcor. = 0,5 –1,12·103 Om, Vcor. - =5,4 - 24·10-5 mm/year and of   Co-Mo-P alloys  ellectrodeposited at 5 – 15 A/dm2:  Icor. =1,2 – 15,6·10-5A,  Ecor. = –0,674 – 0,779 V, Rcor. =  3,7 –1,58·103 Om, Vcor. ~ =5·10-5 mm/year.  It is shown that induced electrodeposition molybdenum  with cobalt is one method to achive materials with high corrosion resistence.