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J Chin Soc Corr Pro  2012, Vol. 32 Issue (1): 80-84    DOI:
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FAILURE ANALYSIS OF PLUNGERS SPRAYED BY  Ni-BASE ALLOY ON HYDRAULIC FEEDBACK SUBSURFACE PUMP
HU Chunlian1, HOU Shanglin2
1. Alloy Powders Co., Ltd, Lanzhou University of Technology, Lanzhou 730050
2. School of Science, Lanzhou University of Technology, Lanzhou 730050
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Abstract  The causes of failure of plungers sprayed by Ni-base alloy were investigated by means of scanning electron microscopy (SEM) and X-ray diffraction meter(XRD). The results indicate that sulfuration and oxidation corrosion occurs in Ni-base alloy coatings of plungers operating in S-O-C mixture condition in oil wells, the complicated loosing and peeling sulfide and oxide salt-like microstructure phase, such as CrS, Cr3S4, Ni3S2, FeS, NiO and other phase are produced to enlarge the diameter of the plungers and make the plungers match difficultly, the hardness of the coating surface remarkably decreases. The corrosion mechanism of Ni-base coatings was studied to prove that the sulfuration resistance and comprehensive applications are dramatically improved by adding Mo and Nb which can refine the grain size and have excellent sulfuration resistance.
Key words:  hydraulic feedback subsurface pump      failure of plungers      Ni-base alloy for spray      sulfuration corrosion     
Received:  09 August 2010     
ZTFLH: 

TG113.231

 
Corresponding Authors:  HU Chunlian     E-mail:  huchl2005@126.com

Cite this article: 

HU Chunlian, HOU Shanglin. FAILURE ANALYSIS OF PLUNGERS SPRAYED BY  Ni-BASE ALLOY ON HYDRAULIC FEEDBACK SUBSURFACE PUMP. J Chin Soc Corr Pro, 2012, 32(1): 80-84.

URL: 

https://www.jcscp.org/EN/     OR     https://www.jcscp.org/EN/Y2012/V32/I1/80

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