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Material Compatibility

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Published in: Mechanical
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The primary areas of concern for materials compatibility include corrosion of metals and impacts on the elastomers.

Harish C / Pune

5 years of teaching experience

Qualification: M.Tech (MIT - 2016)

Teaches: Algebra, Mathematics, Physics, All Subjects, Chemistry, Science, GATE Exam, Engineering Graphics, Mechanical, Mechanics

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  1. "MATERIALS COMPATIBILITY, By Harish M, Choudhary College of Engineering, Pune
  2. 1. 2. 3. 4. CONTENTS Introduction Alcohol Natural Gas LP Gas References Department of Mechanical Engineering, College of Engineering, Pune
  3. 1. 2. 3. INTRODUCTION The primary areas of concern for materials compatibility include corrosion of metals and impacts on the elastomers. The most common job for elastomers in fuel systems is to prevent leaks from fittings and joints. Elastomers used in fuel lines may fail, causing fuel leaks, or become porous and contribute to evaporative emissions. Department of Mechanical Engineering, College of Engineering, Pune
  4. ALCOHOL: METHANOL Methanol and ethanol are the only alcohols considered for use as fuels where they are the major components. Methanol is the most aggressive in terms of materials compatibility, affecting both metals and elastomers. Magnesium has the worst reaction when in contact with methanol. Aluminium is also corroded by contact with methanol, but the reaction is slower than with magnesium. Carbon steel and stainless steel are least affected by methanol.Brass, bronze, and die cast zinc have been found to be corroded more quickly by methanol. Department of Mechanical Engineering,MIT College of Engineering,Pune
  5. ETHANOL Less aggressive toward metals and elastomers than methanol. Ethanol typically has more water in it than methanol ,which may affect solubility of contaminants and corrosion potential. The metals recommended for use with ethanol include carbon steel, stainless steel, and bronze. Like methanol, metals such as magnesium, zinc castings, brass, and copper are not recommended. Ethanol is much less aggressive to elastomers than methanol. Department of Mechanical Engineering,College of Engineering, Pune
  6. Aluminium corrosion in dry ethanol fuel blends is highly dependent on time of 1 mm 100 pm exposure. 3 hr 4 hr 780C EIO pune 12 hr E15 24 hr E20 Department of Mechanical Engineering, College of Engineering,
  7. NATURAL GAS Natural gas contains two contaminants that cause most of its materials compatibility concerns: water vapour and hydrogen sulphide. A serious threat to the materials compatibility of CNG fuel systems is condensed water vapour. Water can cause steel and cast iron to rust and aluminium to corrode. For these reasons it has been recommended that the way to control corrosion in CNG systems is to remove sufficient water vapour to prevent it from condensing in the system LNG has minimum materials compatibility Department of Mechanical Engineering,College of Engineering,Pune
  8. 1. 2. 3. LIQUIFIED PETROLEUM GAS LP gas is predominantly propane which will drive its materials compatibility properties. Impurities in propane can include water, particulates and foreign matter, and residue which includes dissolved components that are left behind when propane is evaporated. Propane is the only alternative fuel other than liquefied natural gas or liquefied hydrogen to enter the fuel tank as a liquid and enter the engine as a completely vaporized gas. Department of Mechanical Engineering,College of Engineering,Pune
  9. 1. 2. REFERENCES Alternate fuels Guidebook, Richard L. Bechtold, SAE International . Engine Materials Compatibility with Alternate Fuels, Oak Ridge National Laboratory . Department of Mechanical Engineering,College of Engineering,Pune
  10. THANK YOU Department of Mechanical Engineering, College of Engineering, Pune

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