The present investigation is related to a well known problem in the regenerative heat exchangers: the internal part corrosion due to acid formation during the gas cooling phase. The Ljungström heat exchanger type has been considered and in particular the internal heating element made by different materials have been investigated in order to identify the best solution in terms of corrosion resistance. In particular two different materials for the heating elements have been considered: an anticorrosion steel (S355JOWP) known as COR-TEN A and a decarburized steel coated with a new generation of porcelain enamel composite. In order to study the anticorrosion effectiveness of the porcelain enamel composites two different coating techniques have been used: a wet flow coating and an electrostatic powder coating. Laboratory accelerated life tests have been performed according to ISO-2722 and ISO-2743 and in particular 30% sulphuric acid solution for different time exposure have been used. Experimental results showed that decarburate steel coated with the porcelain enamel composite via wet flow coating technique exhibit the best behaviour in terms of corrosion resistance.
R. Poletti, A. Zucchelli, A. Chelli (2005). Experimental investigation on corrosion resistance of porcelain enamal composite coating for regenerative air heaters parts. s.l : s.n.
Experimental investigation on corrosion resistance of porcelain enamal composite coating for regenerative air heaters parts
ZUCCHELLI, ANDREA;
2005
Abstract
The present investigation is related to a well known problem in the regenerative heat exchangers: the internal part corrosion due to acid formation during the gas cooling phase. The Ljungström heat exchanger type has been considered and in particular the internal heating element made by different materials have been investigated in order to identify the best solution in terms of corrosion resistance. In particular two different materials for the heating elements have been considered: an anticorrosion steel (S355JOWP) known as COR-TEN A and a decarburized steel coated with a new generation of porcelain enamel composite. In order to study the anticorrosion effectiveness of the porcelain enamel composites two different coating techniques have been used: a wet flow coating and an electrostatic powder coating. Laboratory accelerated life tests have been performed according to ISO-2722 and ISO-2743 and in particular 30% sulphuric acid solution for different time exposure have been used. Experimental results showed that decarburate steel coated with the porcelain enamel composite via wet flow coating technique exhibit the best behaviour in terms of corrosion resistance.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
