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MOISTURE CORROSION IN OPERATING CYLINDERS OF MARINE DIESEL ENGINES

The phenomenon of moisture corrosion in cylinders of marine internal combustion engines operating on sulfuric fuels is analyzed. The generation of acidic products on a sulfur base and the process of formation of an active film of moisture condensate on the working surface of the cylinder bushing are discussed in detail. The formation of a sulfuric anhydride in relation to the temperature and the pressure of the gas mixture in the cylinder and the excess air ratio and the formation of sulfuric acid in relation to the gas mixture temperature in the cylinder and the partial steam pressure are described. According to corrosion processes developed under conditions close to those in diesel engine cylinders, the correlation between the actual and critical surface temperatures, when the cylinder wall becomes damp, is considered to be the principal factor affecting corrosion. The precipitation of the condensate on the cylinder wall is analyzed and demonstrated. To directly combat corrosion in marine diesel engine cylinders operating on high sulfuric fuels, additives are introduced in the form of anticatalysts either into the fuel, thus retarding the production of sulfuric acid, or into the cylinder lubricant, thus neutralizing the condensed acid on the wall. Corrosion can also be directly combatted by using the effect of mass transfer of a water-sulfuric acid mixture in the cylinder and a decreased amount of heat drawn off and stored as in a heat machine by the cooling water. The combined use of the direct and indirect methods is considered to be the most effective means of combatting moisture corrosion in cylinders of marine diesel engines.

  • Corporate Authors:

    TsNIIMF

    Leningrad,   USSR 
  • Authors:
    • Vinogradov, T L
  • Publication Date: 1967

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00014910
  • Record Type: Publication
  • Source Agency: Joint Publications Research Service
  • Files: TRIS
  • Created Date: May 7 1973 12:00AM