Estudo dos efeitos de descargas atmosféricas em estruturas de aço-carbono com e sem revestimento


Structures, equipment and products used in oil and gas industry pipelines are usually exposed to the atmosphere or are buried in natural soil and thus are subject to corrosion damages. Traditionally, the control of corrosion in this type of product is done by means of organic coatings associated with cathodic protection. Although this combination proves to be effective, in recent years failures in service have been observed, even on coated and cathodically protected pipelines. Some of these failures have been attributed to the interference of stray DC or AC electric current, but there are other sources of damage, such as lightning. It is known that lightning cause damages on metallic roofs. However, specific studies o the effect of lightning on other metallic structures and equipment are rare. The objective of this study is to evaluate the effects of lightning on metallic materials. For that, coated and uncoated carbon steel panels were submitted to 400-A electric discharges in order to simulate the current continuing stage of natural lightning. After that, the tested panels were characterized by means of visual examination, metallographic examination and microprobe analysis with the aid of a scanning electron microscope by field emission (FEG-SEM). This paper discusses the influence of lightning time, the presence of the organic coating and the type of medium (air or soil) on tested metals.

PAGOTTO JR., Sidney Oswaldo; PANOSSIAN, Zehbour; SANTOS, Fabiano Raymoundo dos; PIMENTA, Gutemberg de S.; LAURINO, Eduardo W.; OLIVER, João Hepólito L.; GERVÁSIO, João Paulo Klaising; ARAÚJO, Marcelo; TAQUEDA, Maria Helena dos Santos. Estudo dos efeitos de descarga s atmosféricas em estruturas de aço-carbono com e sem revestimento. In: CONGRESSO BRASILEIRO DE CORROSÃO, INTERCORR 2012, 32., 2012, Salvador. Anais…Salvador: ABRACO, 2012. 17p.

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