Cliquez EROSION CORROSION BY SOLID PARTICLES IN SUSPENSION IN AN AQUEOUS CORROSIVE MEDIA Jean-Pierre Audouard Christophe Dernoncourt Revision : 29 July.

Présentation au sujet: "Cliquez EROSION CORROSION BY SOLID PARTICLES IN SUSPENSION IN AN AQUEOUS CORROSIVE MEDIA Jean-Pierre Audouard Christophe Dernoncourt Revision : 29 July."— Transcription de la présentation:

1 Cliquez EROSION CORROSION BY SOLID PARTICLES IN SUSPENSION IN AN AQUEOUS CORROSIVE MEDIA Jean-Pierre Audouard Christophe Dernoncourt Revision : 29 July 1999

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

3 Cliquez MECHANICAL PROPERTIES

4 Cliquez EROSION-CORROSION by SOLID PARTICLES

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

6 Cliquez EFFECT OF EROSION BY SOLID PARTICLES 200 ppm Cl-, 20°C. Solid particles: 300 microns, 100 g/l

7 Cliquez 0 0,5 1,0 1,5 Corrosion Erosion-Corrosion Corrosion rate (mm/yr) N08904 UR B6 32550/S32520 UR 52N+ S31266 UR B66 EFFECT OF EROSION BY SOLID PARTICLES in 30% P 2 0 5 synthetic phosphoric acid at 80°C/176°F

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

9 Cliquez  UR 35N - Duplex 2304 has improved corrosion resistance properties when considering water/aqueous solutions containing chloride ions and/or abrasive particles (Si O 2, sand...) 0.2 0.4 1.0 Weight loss C.Mn steel 304L 2304 UR 35N H 2 O/Na 2 SO 4 + Na Cl + Si O 2 + PH = 3 - V = 3 m/sec 9 ft/sec 80% savings UR 35N - 2304 DUPLEX IMPROVED ABRASION CORROSION RESISTANCE

10 Cliquez GENERAL BEHAVIOUR OF MATERIALS Abrasion vs Corrosion 1 2 3 4 5 6 7 8 123456 SecHumideCorrosion croissante Aciers durs 304316 400 HB 4003 3Cr 12 500 HB PH (Mn +N) Duplex UR B6 UR 52N + 17/7 instables 13/4 Mo 16/5 Mo Aciers outils rapides Fontes au chrome Moins cher que Co plus performant que les inox Co - Cr - Ni + W, Mo etc 8000 13/4 Résistance croissante à l ’abrasion Produits économiques - Tôles plaquées - Revêtements et plaques anti-usure - Mise en œuvre simple