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Automobile engine coolant AM60 Magnesium Alloy Corrosion and Protection

Author: WangSha
Tutor: LiLingJie
School: Chongqing University
Course: Physical and chemical
Keywords: Magnesium alloy Coolant Corrosion Inhibitor Inhibition Mechanism
CLC: TG174
Type: Master's thesis
Year: 2010
Downloads: 172
Quote: 1
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Abstract


As a lightweight magnesium alloy metal material, has been widely used in all areas of society. With the social energy saving, environmental protection, safety concept deepening, more and more auto parts begin to replace conventional cars magnesium alloy metal. If we can become a new magnesium alloy engine materials, can more effectively reduce vehicle weight, the real green energy targets. This paper studies the AM60 magnesium alloys in automotive engine cooling fluid corrosion and corrosion behavior of magnesium alloys results for guiding the vehicle accounted for a large proportion of the engine system applications have a certain significance. In this thesis, electrochemical impedance spectroscopy (EIS), polarization curves and other electrochemical methods investigated AM60 magnesium alloy in ethylene glycol / water based fluid simulation and corrosion of the coolant, and the effects of sodium silicate, sodium phosphate, dodecylbenzene sulfonate on AM60 magnesium alloy in simulated automobile coolant corrosion inhibition, according to the electrochemical parameters evaluated inhibition effect, combined with changes in the pH of the sample morphology and corrosion inhibitors discussed inhibition mechanism. In addition, the paper also through complex inhibitor to reduce the cooling fluid on AM60 magnesium alloy corrosion and optimize formulations and commodity after coolant coolant on AM60 magnesium alloy corrosion were compared. AM60 magnesium alloy in ethylene glycol / water based fluid in a very weak and very slow corrosion, temperature increased corrosion; AM60 magnesium alloy at room temperature in the simulated body fluid showed pitting corrosion, the corrosion product film surface of the alloy to a certain time and temperature range of the alloy surface protection. According to the calculated experiment shows that the activation energy values, magnesium alloy in ethylene glycol / water based liquid corrosion reaction experimental activation energy value 27.73KJ/mol, far greater than the value of the analog coolant 2.24 KJ / mol, description in ethylene glycol / water based liquid corrosion reaction harder to happen. In the simulated cooling was added sodium silicate, sodium phosphate and sodium dodecylbenzenesulfonate inhibitor, the inhibition efficiency within a certain range of concentration increases with the concentration. Sodium AM60 magnesium alloy which does not provide for a long period of protection, which may be the stability of the hydrolyzate of the phosphate. Sodium silicate and sodium dodecylbenzenesulfonate were exhibited anodic inhibitor characteristics. In addition, after adding the corrosion reaction inhibitor experiments activation than the experimental activation energy without adding larger value, describes the three inhibitors can inhibit corrosion to a certain extent, of the reaction. Among them, several experimental activation energy in the system in the order of: sodium silicate gt; dodecyl benzene sulfonate gt; sodium gt; blank. By inhibitor compound found sodium silicate and sodium tungstate compound when AM60 magnesium alloy corrosion best. AM60 magnesium alloy by the formula after the optimized coolant and coolant products A, B in corrosion research shows that several systems under normal temperature corrosion current density of the order of: coolant A gt; coolant B gt; optimized coolant; high temperature corrosion current density in the order of: coolant A gt; optimized coolant gt; coolant B. It can be explained, after optimization of the cooling liquid formulations suitable AM60 magnesium alloy at room temperature in the engine cooling system application, but the application of high temperature remains to be further optimized formulation improvements.

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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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