A MÖSSBAUER STUDY OF ME INTERACTION BETWEEN α-ION AND ALUMINOPHOSPHATE AND ALUMINO-CHROMO-PHOSPHATE ADHESIVES

(1)

HAL Id: jpa-00219637

https://hal.archives-ouvertes.fr/jpa-00219637

Submitted on 1 Jan 1980

HAL

is a multi-disciplinary open access archive for the deposit and dissemination of sci- entific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers.

L’archive ouverte pluridisciplinaire

HAL, est

destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

A MÖSSBAUER STUDY OF ME INTERACTION BETWEEN α-ION AND ALUMINOPHOSPHATE

AND ALUMINO-CHROMO-PHOSPHATE ADHESIVES

T. Peev, G. Iovkov, A. Vértes, S. Nagy

To cite this version:

T. Peev, G. Iovkov, A. Vértes, S. Nagy. A MÖSSBAUER STUDY OF ME IN- TERACTION BETWEEN

α-ION AND ALUMINOPHOSPHATE AND ALUMINO-CHROMO-

PHOSPHATE ADHESIVES. Journal de Physique Colloques, 1980, 41 (C1), pp.C1-393-C1-394.

�10.1051/jphyscol:19801151�. �jpa-00219637�

(2)

JOURNAL DE PHYSIQUE Coiioque C1, supplkment au n O 1 , Tome 41, janvier 1980, page Cl-393

A &SBAUER SnalY OF M E INTERACTION BETWEEN a-ION AND ALUMINOPHOSPHAE

AND

ALUMINO-CHROm)-PHOSPHATE ADHESIVES

R

T.M. Peev, G.M. Iovkov, A. V6rtes and S. ~ a g ~ "

Higher school of Chemical technology, Dept. Phys. Chem., 8010 Bourgas, Bulgaria.

x ~ordrzd EUtvbs University, Dept. Phys. Chem. and Radiozogy, 1088 Budapest, Hungary.

The aluminophosphate and alumino-.chrmo- #2

-.

⁶⁰mg iron powder

+

100 mg alumino-.

phosphate

+

^{50 mg Ti0}

phosphate are frequently used as metal ado- 2'

hesives. Ti02 is generally an additional component of these materials and it incre- ases the coating effect. These coatings' adhesion to the metals is considerable and they give an intensive protection to the metals against the chemical and thermal corrosion. The aim of this work is to study the chemical interaction between the a-iron and these types of adhesives.

# 3

--

5 0 ma iron nowder

+

120 mg alumino--

-choromo-phosphate.

#I ^-,0 0 mg iron powder

+

120 mg alu-ino- -chroma-phosphate

+

⁶⁰^{mg TiOZ}

All the four samples were stirred and heat-treated at 2 7 5 O ~ for 6 hours,

This process results in an amorphous phaSe (adhesive) in which the nhosphate an- ions and-metal cations form nolymer struc-

17 / ture

.

EXPERIP,IENTAL

The dry material was mixed with ooly-- The preparation of aluminophosphate was

vinylalcohol and nra&to form tablets in carried out by stirring 156 cm3 75% H3P04+

2

+

60 g Al(0Ii)

+

130 cm3 H20 at 80°c for which the iron content was 15 mg/cm

.

20 min and then the solution was boiled for The Mijssbauer source was 1'5-10 Bq ⁸ 10

minute^'^-^/.

The pH and the density of 5 7 ~ o ( ~ d ) but the results were given rela-

tive to a-iron.

the solution were 2,55 and d = 1,75 g/cm

(at 20°c) respectively. RESULTS AND DISCUSSION

The alumino-chromo-phosphate was pre-. The recorded snectra are shown in Fig.1.

pared stirring 300 crn3 65% H 3 W 4

+

20 g Thev demonstrate that the studied phosphate Cr03

+

50 g A1(OH)3 at 80°c for 20 minutes adhesives interact with a-iron at 2 7 5 O ~ and and at boiling temperature for 30 minutes. a significant Dart of a-iron transforms to crV1 was reduced to crlI1 by ethylerglycolif'61 iron(I1) and iron(II1) com?ounds.for 6 hours The main parameters of this solution were: The tabulated data of Table I. show that pH = 2,21 and d = 2,38 g/cm3 (at 20°c). the presence of Ti02 hinders the oxidation

The absorbers for the Mtlssbauer mea- of a-iron ( see sample

#

^{2 and #4}1.

surements were prepared by the use of the The obtained isomer shifts ( 6 ) and following materials. quadrupole splittings CAE) for iron(II1)

#

¹

--

60 mg iron powder

+

100 mg aluminoa- were 0,30 m / s

-

0,45 m / s and 0,75 m / s -.

phosphate-

-

^0,91mm/s, resnectively, at room tempera-.

Article published online by EDP Sciences and available at http://dx.doi.org/10.1051/jphyscol:19801151

(3)

JOURNAL DE PHYSIQUE

,95. ..

.

^{; .}_*'^{> : .}_:^.

1.85.

as. .. i .:

Fig I. Mossbauer s p e c t r a r e c o r d e d a t room t e m p e r a t u r e . See e x p Z i c a t i o n s o f t h e numbers i n t h e t e x t o f t h e experirnen- t a t . ( T h e o n l y i n n e r t i n e s o f i r o n was r e c o r d e d ) .

Table I.

Areas o f t h e s p e c t r u m components i n % and caZcuZated t h i c k n e s s e s o f t h e i r o n

-

a d h e s i - v e i n t e r p h a s e s

'~e '~(11) '~(111) Calculated

- - -

I

^so ^So ^So Thicness X(pm)

These results suggest that iron(I1)- and iron(II1)-phosphates and gerhaps metha- phosphates bonds develop at the iron-adhe-.

sive interphase acd the iron(together with the ~1'" and ~r"' cations) takes its pla- ce in the formation of the metal-phosphate polimers at the iron-adhesive interphase.

The ~arameters of the F-lessbauer s@ctra measured at liquid nitrogen temperature are practically the same as those measured at room temperature. This result proves that chemical structure (distances and angles of the chemical bonds) of the iron-adhesive interphase is unsensitive (resistance) to the change of the temperature.

REFERENCES

1. Kindery, V.D., J. Amer. Ceram Soc., 33(1950)239.

-

2. Kuprog, E., Koltermann, 14., Ber. D.K.G., 44(1967)H--9.

-

3. Chvatal, Th., Osterreichisches patentank No 231377, 15.V.1963 (15.XI.1960).

'~e ⁼the area of the metalic iron componmt So ⁼the total area of the spectrum

S P 11 ⁼the area of the iron(I1) comenent S I11 = the area of the iron(III) component

P

X The awerage particle size of the used iron powder was 3 pm and it was supposed that the iron particles were spmetrical spheri-- cally

ture. For iron(I1) the measured isomer shifts were between 1,14 mm/s .- 1,24 m / s and the quadrupole splittings were between 2,16 m l s

-

2,49 mm/s. These b18ssbauer parameters are very similar to those mea-.

sured for iron(I1)- and iron(II1)--phosmtes;

-.phosphate--hydrates and metha--phosphates in the crystal- and glass--phases 10-101

4. Bectel, H., Ploss, G., Ber. D.K.G.

37(1960)H-8

.

5. Chvatal, Th., S~rechsool fur Ker.-Glass-- Email--Silikate. No 20(1966)903.

6. Chvatal, Th., Osterreichisches paten-, NO 229780. 15.11.1963. (2.VI.1959).

7. tlorrisl J.H., Perbius, P.G., Rose A.E.A., Smith, W.E., Chem. Soc. Revs, 5(1977)173.

8. ~urkjian, C.R., Buchanan, D.N.E., Phys.

Chem. of Glasses, 5(1964)63.

9. Kurkjian, C.R., Sigety, E.A., Phys.

Chem. of Glasses, 2(1968)73.

10. Taragin, Y.F., Eisenstein, J.C., Haller, W., Phys. Chem. of Glasses, 13(1972)149.

-