Evaluation of mineral oils as matrices for AISI/SAE–1020 steel naphthenic corrosion study

Petrochemical industry has suffered great economic impact due to light crude oil reserves reduction, so refineries have been processing high acidity heavy crude oils. Studies of corrosion caused by naphthenic acids are interfered by presence of other corrosive agents contained in real crude oils, so naphthenic phenomenon must be isolated using synthetic crude oils. For this reason, in present work two high purity mineral oils were used to evaluate their efficiency as synthetic crude oil matrices in AISI/SAE–1020 steel naphthenic corrosion study. Temperature levels evaluated were 200 °C, 250 °C, and 300 °C, while exposure times evaluated were 5, 10 and 15 hours. Surface morphological characterization of AISI/SAE–1020 steel was carried out using scanning electron microscopy and X–ray diffraction. Gravimetric tests showed that AISI/SAE–1020 steel naphthenic corrosion rate increases with temperature and exposure time for one of the synthetic crude oils. However, results obtained for the other synthetic crude oil did not show increasing behaviour due to presence of sulfur traces in the oil, which caused an interference with AISI/SAE–1020 steel naphthenic corrosion study, reducing the reliability of gravimetric results so they cannot be extrapolated to operating conditions in distillation units.

Corrosion Study of Carbon Steel in Carbonated BUMEA-2EE Nonaqueous Solution

Different effort has been attempted to reduce the equipment corrosion of CO2 absorption using chemical solvents. In this paper, the corrosion of carbon steel in carbonated 2-(butylamino)ethanol (BUMEA)-2-ethoxyethanol (2EE) non-aqueous solution was studied by using a CHI602E electrochemical analyser. The polarization behaviour and corrosion rate of carbon steel in non-aqueous blends of BUMEA-2EE were investigated. The influence of temperature, the mass fraction of BUMEA (wBUMEA) and CO2 loading (α) on the corrosion rate were clarified.

RESEARCH OF CATHODE PROCESS AT CORROSION STANDARDS, PROTECTED BY POLYMERIC TAPES, IN SOLUTION OF NACL

A corrosion study of ST-3 steel samples in a 3% sodium chloride solution was car ried out. The test steel samples were pre-coated with two different polymer films based on styrene acrylic latexes. The analysis of the process of cathodic polarization shows that on the metal in both.