Desgaste corrosivo-cavitativo-erosivo de um aço-carbono em meio aquoso com frações de sal (NaCl), CO2 e particulados sólidos (SiO2)
A batch of eighty-four coupons of low carbon steel were investigated at laboratory conditions under a corrosive, cavitative-corrosive (CO2) and corrosive-erosive (SiO2 + CO2) in an aqueous salt solution and two levels of temperature. The following measurements were made on Vickers (HV0,05, HV0,10, H...
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| Formato: | Dissertação |
| Idioma: | por |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/15699 |
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| Resumo: | A batch of eighty-four coupons of low carbon steel were investigated at laboratory
conditions under a corrosive, cavitative-corrosive (CO2) and corrosive-erosive (SiO2 +
CO2) in an aqueous salt solution and two levels of temperature. The following
measurements were made on Vickers (HV0,05, HV0,10, HV0,20) Microhardness tests at
three levels of subsurface layer. A turbulent flow collided on the cylindrical sample,
with and without mechanical stirring and gas bubbling, with and without fluid
contamination by solid particles of SiO2, at two temperatures. Surface Roughness
and Waviness, under two conditions "as received, after machining" and "after worn
out", as well as gravimetric and electrochemical parameter were measured on the
two opposite generatrices of each cylindrical sample, on the flow upstream (0°) and
downstream (180°) by Profilometry, Mass Variation and Linear Polarization
Resistance (LPR). The results of the Microhardness and Surface Texture of all
coupons were subjected to statistical comparison, using the software Statgraphics®
Centurion XVI, 95% statistical certainty, and significant differences were observed in
some arrays of measurements. The corrosive wear rate measured by LPR and mass
variation shown to be sensitive to the presence of bubbles and hydrodynamic
fluctuations inside the cell, considering the temperature and contamination of
corrosive fluid by solid particles. The main results of visual inspection relative to
some topologies of the surface damages involving different mechanisms that were
seen to give explanation for some fluctuations in wear rates of the steel
experimentally investigated |
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