Title

STUDY OF THE SURFACE MORPHOLOGY OF A CARBON STEEL AFTER TESTINGS CORROSIVE-CAVITATIVE-EROSIVE WEAR IN AQUEOUS MEDIUM WITH SALT (NaCl), CO2 AND SOLID PARTICULATES (SiO2) FRACTIONS

Authorship

Fernando Nunes da Silva; Plínio Melo de Oliveira; Eugênio Teixeira de Carvalho Filho; Jardel Dantas da Cunha; Djalma Ribeiro da Silva; João Telésforo Nóbrega de Medeiros

Fernando Nunes da Silva

I am this author

Plínio Melo de Oliveira

I am this author

Eugênio Teixeira de Carvalho Filho

I am this author

Jardel Dantas da Cunha

I am this author

Djalma Ribeiro da Silva

I am this author

João Telésforo Nóbrega de Medeiros

I am this author

DOI

10.5151/1472-5836-25610

Downloads

Abstract

Wear mechanisms of materials that constitute the equipments and operating parts in the pre-salt area during the production of petroleum and gas can include corrosion, corrosion-cavitation and corrosion-cavitation-erosion. In the laboratory, it is realizable, but at times it is inaccurate to reproduce or visualize some of these mechanisms due to the real complexities caused by hydrodynamic flows, and the physico-chemical and mechanical non-linearities. The main objective of this work was to study coupons of low carbon steel under laboratory conditions, such as corrosive, cavitative-corrosive (CO2) and corrosive-erosive (CO2 + SiO2), in a stirring aqueous saline solution (0 and 5.0 m/s) at two levels of temperature, with bubbling of gas (5.0 L/min) and contaminated with or without (2.5 % mass), by solids particles of SiO2. The surface of the coupons subjected to upstream flow (0° in a cylindrical generatrix of coupon), and downstream flows (180º) were analyzed by profilometry. The measurements of roughness and waviness of all coupons were statistically analysed using Statgraphics® Centurion XVI, at a confidence level of 95% and significant differences observed in some matrices were discussed.

Keywords

Tribochemistry; Corrosion; Erosion; Cavitation; Surface texture