Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
EFFECT OF CONCENTRATION, STIRRING AND TEMPERATURE ON CORROSION BY NAPHTHENIC ACID IN A335-P5 STEELS USING THE ELECTROCHEMICAL NOISE TECHNIQUE
Submission Author:
Adalberto Baptista , PR , Brazil
Co-Authors:
Adalberto Baptista
Presenter: Adalberto Baptista
doi://10.26678/ABCM.COBEM2017.COB17-0783
Abstract
During the oil refining process, the equipment is exposed to the action of compounds such as sulfides, chlorides and carboxylic acids present in the oil. The choice of materials used to perform the design of a refinery or a petrochemical plant considers the different compounds present in petroleum, but the different compositions present in the oils from different parts of the world make this task more complicated, making it even more difficult to choose materials that can withstand all of these process conditions. The control of corrosion by naphthenic acids is one of the great challenges of refineries that process acid oils. This corrosive process, which mainly affects high temperature circuits in oil refineries can lead to rapid mass loss and equipment failure. Many jobs have been developed for information that minimizes corrosion damage. The objective of this work is to analyze the effects of agitation and temperature on the kinetics of corrosion by naphthenic acids, using the technique of Electrochemical Noise in solutions of mineral oil and naphthenic acids in various concentrations. The technique of Electrochemical Noise is based on the non-perturbation of the reaction medium, that is, it does not suffer external interferences. They are spontaneously generated current and potential fluctuations in corrosive reactions. Data acquisitions were performed at temperatures of 100 °C (373.15 K), 150 °C (423.15K) and 175 °C (448.15 K) and at rotational speeds of 0 rpm, 200 rpm and 400 rpm. Three cylindrical and solid electrodes were used for the acquisition of electrochemical noise data, two working electrodes (ASTM A335 P5) and one reference electrode (AISI 316). This study proposes the use of the Electrochemical Noise technique as a tool to evaluate an on-line monitoring methodology, allowing a quantitative evaluation of the corrosion rate.
Keywords
corrosion, Naphtenic Acid, Electrochemistry Noise, Petroleum, Mass transfer
