About this erosion corossion and cavitation in impeller what is the best material for rebuilding the impeller? In625 , Hastalloy C22 , C276
i notice becase the base metal has PREN<40 it would be a galvanic corossion cell when using the Ni base layers over duplex stainless steel. the base metal...
Dear friends
I look at the other data. it seems the failure mechanism is erosion corrosion caused by sand and glass type particles available in sea water in this region. by combining this with highly agitated water in the surface of blades you can see many scratches in the root of blades. the...
Hi i think it is cavitation. excuse me for misleading. about HVOF most of the time i doubt about proper bonding to the tips of blades. I think it is not a good surface and substrate for proper bonding of HVOF. you can see the corossion and erosion on the surface in this picture. the blades are...
@cap1a79 the pump is vertical one. the api 610 is about centrifugal pumps. I am not sure if it can be applied to this standard. However as you and weldstan mentioned it is important the duplex SS does not exposed after welding overlay. We have all range of inspection available. Moreover we try...
@ weldstan thanks. is there any consideration about weld overlay? some general guidlines used for duplex SS welding also should be used here?
@edstainless the pump is an old version. it works for years and now the owner does not like to disassemble the whole shaft and impeller. i think using...
Dear freinds
for repairing a highly corroded impeller made from duplex stainless steel which is working in a sea water pump i suggest to use IN625 or Hastalloy C276 overlay for rebulding and restoring blades. The impeller blades has crevice corrossion and lost thickness during many years of...
