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Erosion-Corrosion Assessment of CR White Irons

Product Number: 51321-16478-SG
Author: Md. Aminul Islam/Jiaren (Jimmy) Jiang /Yongsong Xie
Publication Date: 2021
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Erosion-corrosion  possesses  a  serious  problem  for  the  mining  and  mineral  processing  industries. Handling  and  processing  of  silica-based  solids  results  in  extremely  severe  wear  conditions. Simultaneous  action  of  erosion,  corrosion  and  their  synergistic  interactions  accelerates  the material  damage.  Chrome  white  irons  (CWI)  are  extensively  used  in  the  oilsands  industry  for slurry  handling  equipment.  Erosion-corrosion  resistance  of  CWI’s  depends  on  the  chemical composition,  matrix  microstructure,  types  and  volume  fraction  of  carbides.  In  this  study,  high-Cr white  irons  were  assessed  using  a  slurry  pot  erosion-corrosion  testing  apparatus,  where  the  total erosion-corrosion  (E-C)  rate  as well  as the  separate components  of  synergy  were  determined.  It was  found  that  corrosion  resistance  of  white  irons  largely  depends  on  the  amount  of  dissolved chromium  in  the  matrix.  On  the  other  hand,  erosion  resistance  is  controlled  by  the  type  and volume  fraction  of  carbides.  During  erosion-corrosion,  corrosion  enhanced  erosion  dominates  the synergistic  component.  Material  degradation  rate  depends  on  the  involved  wear  mechanisms. SEM  observation  revels  that  cutting  of  the  metal  matrix  by  erodent  at  low  impingement  angles, micro-fracture of  the  carbides  and spallation are  the  dominant  mechanisms.   

Key  words:  Erosion-corrosion,  synergistic  effect,  CWI,  slurry  pot  testing 

Erosion-corrosion  possesses  a  serious  problem  for  the  mining  and  mineral  processing  industries. Handling  and  processing  of  silica-based  solids  results  in  extremely  severe  wear  conditions. Simultaneous  action  of  erosion,  corrosion  and  their  synergistic  interactions  accelerates  the material  damage.  Chrome  white  irons  (CWI)  are  extensively  used  in  the  oilsands  industry  for slurry  handling  equipment.  Erosion-corrosion  resistance  of  CWI’s  depends  on  the  chemical composition,  matrix  microstructure,  types  and  volume  fraction  of  carbides.  In  this  study,  high-Cr white  irons  were  assessed  using  a  slurry  pot  erosion-corrosion  testing  apparatus,  where  the  total erosion-corrosion  (E-C)  rate  as well  as the  separate components  of  synergy  were  determined.  It was  found  that  corrosion  resistance  of  white  irons  largely  depends  on  the  amount  of  dissolved chromium  in  the  matrix.  On  the  other  hand,  erosion  resistance  is  controlled  by  the  type  and volume  fraction  of  carbides.  During  erosion-corrosion,  corrosion  enhanced  erosion  dominates  the synergistic  component.  Material  degradation  rate  depends  on  the  involved  wear  mechanisms. SEM  observation  revels  that  cutting  of  the  metal  matrix  by  erodent  at  low  impingement  angles, micro-fracture of  the  carbides  and spallation are  the  dominant  mechanisms.   

Key  words:  Erosion-corrosion,  synergistic  effect,  CWI,  slurry  pot  testing 

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