Supercritical CO2 cleaning of carbonaceous deposits on diesel engine valve

Weiwei Liu, Xiaochuan Qing, Mingzheng Li, Lihong Liu, Hongchao Zhang

Research output: Contribution to journalConference articlepeer-review

5 Scopus citations


Carbonaceous deposits can reduce the durability and performance of diesel engines. Chemical cleaning methods are widely used to remove the deposits in remanufacturing industry but the wasted liquid is harmful to the environment. In this paper the supercritical CO2 cleaning technology, an environmentally friendly approach, has been used to remove these contaminants. The surfaces of diesel engine valve before and after cleaned were examined by field emission scanning electron microscope (FE-SEM) and Fourier transform infrared spectroscope (FT-IR). The testing results showed that most organic compounds were dissolved and the stubborn contaminants were changed to be removed easily after cleaning by supercritical CO2 fluid. The new cleaning method can reduce carbonaceous deposits significantly without changing the surface properties of the diesel engine valve.

Original languageEnglish
Pages (from-to)828-832
Number of pages5
JournalProcedia CIRP
StatePublished - 2015
Event22nd CIRP Conference on Life Cycle Engineering, LCE 2015 - Sydney, Australia
Duration: Apr 7 2015Apr 9 2015


  • Carbonaceous deposits
  • FE-SEM
  • FT-IR
  • Remanufacturing
  • Supercritical CO


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