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EROSION CORROSION BY SOLID PARTICLES IN SUSPENSION IN AN AQUEOUS CORROSIVE MEDIA Jean-Pierre Audouard Christophe Dernonc

EROSION CORROSION BY SOLID PARTICLES IN SUSPENSION IN AN AQUEOUS CORROSIVE MEDIA Jean-Pierre Audouard Christophe Dernoncourt. to be completed . Revision : 29 July 1999. PICTURE OF EROSION-CORROSION IN PHOSPHORIC ACID WITH SOLID PARTICLES. MECHANICAL PROPERTIES.

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EROSION CORROSION BY SOLID PARTICLES IN SUSPENSION IN AN AQUEOUS CORROSIVE MEDIA Jean-Pierre Audouard Christophe Dernonc

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  1. EROSION CORROSIONBY SOLID PARTICLESIN SUSPENSION IN AN AQUEOUS CORROSIVE MEDIAJean-Pierre AudouardChristophe Dernoncourt to be completed ... Revision : 29 July 1999

  2. PICTURE OF EROSION-CORROSION IN PHOSPHORIC ACID WITH SOLID PARTICLES

  3. MECHANICAL PROPERTIES

  4. EROSION-CORROSION by SOLID PARTICLES

  5. EROSION-CORROSIONSolid particles : 50 g/l SiC 99 microns, Impact Angle 90d, Velocity 5.5 m/s, temperature 25°C/77°F

  6. EFFECT OF EROSION BY SOLID PARTICLES200 ppm Cl- , 20°C. Solid particles: 300 microns, 100 g/l

  7. EFFECT OF EROSION BY SOLID PARTICLESin 30% P205 synthetic phosphoric acid at 80°C/176°F Corrosion rate (mm/yr) Corrosion Erosion-Corrosion 1,5 1,0 0,5 0 N08904 32550/S32520 S31266 UR B6 UR 52N+ UR B66

  8. FIELD TESTS IN RHONE-POULENC PLANTSCorrosion-Abrasion of Central Agitators Di-hydrate process ( 80°C/176°F) Corrosion rate (g) Corrosion rate (mm/year) 50 1 Samples fastened to Surface Agitators - Dn1 reactor 40 - Samples attached to surface agitators 30 - linear speed < 5 m/s 0,5 20 - test duration : 9 months 10 0 0 08028 URB28 08926 URB26 URB6 08904 32520 UR 52N 32520 N 06625 08926 URB26 + + UR 52N UR 625 In GREECE In BELGIUM

  9. UR 35N - 2304 DUPLEX IMPROVED ABRASION CORROSION RESISTANCE 1.0 H2O/Na2 SO4 + Na Cl + Si O2 + PH = 3 - V = 3 m/sec 9 ft/sec 80% savings Weight loss 0.4 0.2 C.Mn steel 2304UR 35N 304L • UR 35N - Duplex 2304 has improved corrosion resistance properties when considering water/aqueous solutions containing chloride ions and/or abrasive particles (Si O2, sand...)

  10. GENERAL BEHAVIOUR OF MATERIALS Abrasion vs Corrosion 8 Co - Cr - Ni + W, Mo 7 etc Aciers outils Fontes au rapides chrome Moins cher que Co 6 plus performant que les inox 8000 5 Résistance croissante à l ’abrasion + UR 52N 4 (Mn +N) 500 PH UR B6 Duplex HB 3 17/7 400 13/4 instables HB 2 13/4 Mo 4003 16/5 Mo 3Cr 12 1 Aciers 304 316 durs Sec Humide Corrosion croissante 1 2 3 4 5 6 - Tôles plaquées Produits économiques - Revêtements et plaques anti-usure - Mise en œuvre simple

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