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Evaluation of the Resistance of Metallic Tank Materials Under the Influence of Biofuels

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Research to determine the corrosion behavior of commercial metallic tank materials in fuels and heating oil with admixtures of biogenic sources, such as gasoline with addition of ethanol (E10, E85), pure biodiesel and heating oil with 10 % biodiesel (B10).

Product Number: 51317--8854-SG
ISBN: 8854 2017 CP
Author: Margit Weltschev
Publication Date: 2017
Industry: Pipelines, Tanks, and Underground Systems
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The question arose whether the resistance of the commercial tank to fuels with bioethanol and biodiesel (rapeseed oil fatty acid methyl ester) is given.Changes in fuel composition and the introduction of alternative fuels often create problems of corrosion and degradation in materials. The objective of this research was to determine the corrosion behaviour of commercial metallic tank materials [unalloyed steels austenitic CrNi- and CrNiMo-steels aluminium (-alloys)] in fuels and heating oil with admixtures of biogenic sources such as E10 E85 biodiesel and B10 (heating oil with 10% biodiesel).Metallic tank materials are evaluated as resistant in a liquid if the annual corrosion rate due to uniform corrosion does not exceed 0.1mm/year and localized corrosion effects in form of pitting corrosion stress corrosion cracking and crevice corrosion do not occur.The corrosion rates of the metallic materials after exposure to E10 E85 non-aged and two year aged biodiesel and bioheating oil B10 with 10% biodiesel (non-aged and one year aged) for four weeks at 50°C according to DIN50905/4 were well below the limit of 0.1mm/year. For the un-alloyed steels the formation of rust was observed independently of the biofuels amount of ageing. U-bend specimens made of unalloyed steel were not damaged in form of stress corrosion cracking.

Key words: biodiesel, bioethanol, tank materials, corrosion resistance, stress corrosion cracking

The question arose whether the resistance of the commercial tank to fuels with bioethanol and biodiesel (rapeseed oil fatty acid methyl ester) is given.Changes in fuel composition and the introduction of alternative fuels often create problems of corrosion and degradation in materials. The objective of this research was to determine the corrosion behaviour of commercial metallic tank materials [unalloyed steels austenitic CrNi- and CrNiMo-steels aluminium (-alloys)] in fuels and heating oil with admixtures of biogenic sources such as E10 E85 biodiesel and B10 (heating oil with 10% biodiesel).Metallic tank materials are evaluated as resistant in a liquid if the annual corrosion rate due to uniform corrosion does not exceed 0.1mm/year and localized corrosion effects in form of pitting corrosion stress corrosion cracking and crevice corrosion do not occur.The corrosion rates of the metallic materials after exposure to E10 E85 non-aged and two year aged biodiesel and bioheating oil B10 with 10% biodiesel (non-aged and one year aged) for four weeks at 50°C according to DIN50905/4 were well below the limit of 0.1mm/year. For the un-alloyed steels the formation of rust was observed independently of the biofuels amount of ageing. U-bend specimens made of unalloyed steel were not damaged in form of stress corrosion cracking.

Key words: biodiesel, bioethanol, tank materials, corrosion resistance, stress corrosion cracking

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