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Discussion Forums - The Hendrix Group
HomeHomeDiscussionsDiscussionsMaterial Select...Material Select...Tungsten Carbide Vs Nickel Chrome CoatingTungsten Carbide Vs Nickel Chrome Coating
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11/18/2003 9:00 AM
 
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We are soon to construct a small wastewater pump station. We have previously used cast iron pumps with good success as the waste primarily consists of water and is therefore not particularly corrosive. In this instance the water has high chlorides (2600ppm) and dissolved solids. We have concerns that the cast iron body and impellor will corrode, particularly given that it may sit at rest for some time. The supplier has offered to coat the body with a liquid applied epoxy and coat the impellor with either Tungsten Carbide or Nickel Chrome. Can someone please give me some general info on these coating systems and give advice on which system we should be specifying based on cost/life expectancy? Thanks in advance Adrian
 
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11/27/2003 9:00 AM
 
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Adrian: Thank you for your interest in our technical discussion forum. Regarding your pump application questions, the usefullness of the recommended coating systesm will depend largely on the quality of the appcliation. Epoxy coatings and tungsten carbide are two very different applications! I question whether the epoxy coating is a long term solution as I suspect that the coating will not be applied without holidays and that it will degrade due to solids erosion. The tungsten carbide is a hard coating, more used for erosion, abrasion than corrosion resistance, although it does possess some corrosion benefits vs. CI. I would give the present CI pump a try and see what its life is, unless the on-stream time application is high and critical. Hope this helps! David Hendrix The Hendrix Group Inc.
 
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