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Titanium metal corrosion and electrochemical corrosion studies

Author: LiuHaiYan
Tutor: KongDeSheng
School: Qufu Normal University
Course: Physical and chemical
Keywords: Titanium Corrosion Inhibitor Tafel curves AC impedance
CLC: TG174
Type: Master's thesis
Year: 2010
Downloads: 324
Quote: 0
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Abstract


Titanium is a versatile metal structural metals, titanium industrial value from resource development prospects of life and see, with the new technological revolution and the industrial revolution in depth, titanium will become iron, aluminum after the rise of the \\So, to promote the use of titanium characteristics play a dominant role in promoting industrial development and enhance the vitality of product competition plays an important role, but also the direction of the development of modern technology. Although titanium is an easily passivated strong corrosion resistance of a metal material, but in certain aggressive ions or compounds containing environments, because the oxide film of TiO2 damage to the substrate and loses its protective titanium and causes the corrosion of titanium. Therefore, the problem of Corrosion and Protection of titanium much attention, is the study of materials science and electrochemistry an important issue. NaF system on the metal equipment can cause serious corrosion damage system. Corrosion of NaF systems and protective measures has important practical significance. In this paper, cyclic voltammetry, steady-state polarization and electrochemical impedance spectroscopy, a detailed study of sodium fluoride solution, titanium electrode corrosion and corrosion inhibition performance as well as collaboration and to explore the inhibition mechanism. The main research work and conclusions are as follows: sodium perchlorate solution was added sodium fluoride, by making cyclic voltammetry curves we can get: With the fluoride concentration, the anodic peak current increased, titanium gradually increase the electrode corrosion, titanium electrode anodic dissolution easier fluoridemouthwash titanium electrode has a strong corrosive. Adding sodium molybdate and sodium fluoride after the system, with the added release agent concentration, the anode current decreases, phosphate and molybdate salts described mixture with the electrode can be formed on the surface of the titanium layer of protective film that can slow anodic dissolution of titanium electrodes. Through steady polarization test results obtained with sodium fluoride concentration increases, the corrosion potential shifted negatively corrosion current becomes large, which indicates that as the concentration increases, the titanium electrode corrosion intensified. System in 0.1 M sodium fluoride added sodium molybdate, sodium phosphate as corrosion inhibitors, corrosion potential is shifted and the corrosion current decreases, which can effectively alleviate the corrosion of metallic titanium. Adding sodium phosphate and sodium molybdate complex corrosion inhibition effect than the addition of a corrosion inhibitor alone better than, when a ratio of 3:7 complex inhibition effect best inhibition efficiency is calculated using the slow erosion efficiency can reach 71.8%. Electrochemical impedance test results show that the concentration of sodium fluoride was added the greater the smaller the diameter of the semicircle capacitance with increasing concentration of sodium fluoride, Rs, Rt decreases, indicating that increased corrosion in fluoride ion concentration, the accelerated corrosion of titanium electrodes. Sodium molybdate and sodium titanium electrodes have a synergistic inhibition effect, the concentration of total added 0.8g / L under the same circumstances, when the ratio of sodium phosphate and sodium molybdate is 3:7, both the concentration of 0.024g / L and 0.056g / L, the highest synergistic inhibition efficiency than when used alone inhibition effect of sodium molybdate better.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metal corrosion protection,metal surface treatment > Corrosion control and protection
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