Dear Esteemed Colleagues,
Can increase in hardness and tensile strength of metals exposed to biodiesel be linked with any of the following factors:
1. Inter molecular reaction of the metals with the presence of biodiesel;
2. Akhlaghi et al. (2015) noticed tensile strength and hardness values for the elastomers exposed in rapeseed biodiesel were lower than these values of diesel fuel. What is additives loss in metals? Akhlaghi et al. (2015) reports about the additives loss in rubber. Is it possible to make the same relationship for metals?
3. loss in the alloy element of metal such as brass.
Kindly explain.
Akhlaghi, S., Hedenqvist, M. S., Braña,M.C., Bellander, M., Gedde, U. W. (2015). Deterioration of acrylonitrile butadiene rubber in rapeseed biodiesel, Polymer Degradation and Stability, 111, 211-222.
I suspect aging. The biodiesel may be prolonging heat retention within the metal (insulation effect) and thus heightening and prolonging aging.
What kind of metals? Usually polymers change their properties because od biodiesel impact. Biodiesel has similar chemical structure what influence on polymer's chemical structure. According to metals - got not so many ideas. Different metals in electrolyte environment making voltage and corrosion may be found. Some special layer may be formed on the metal surface because biodiesiel is bio, and some live bacteria may cover surface. The question is what type of hardness test was used?
The reasonable explanation for the higher hardness and tensile strength of and its blends compared to pure diesel fuel can be attributed to the increase of dissolved oxygen concentration and conductivity of the biodiesel-diesel fuel blends which positively improve mechanical properties of metals
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