Copper Dissolution Rate as a Function of the Corroding-Surface Tilt

Miečinskas, Povilas

doi:10.1007/s11175-005-0132-x

Cited by 3 publications

(2 citation statements)

References 15 publications

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“…Copper and its alloys, as well as zinc and it alloys due its protection from corrosion, are the most applicable materials used in industry due to their high electrical conductivity, mechanical workability, relatively noble properties, and good availability. There are many experiments for zinc and copper reactions in dilute sulfuric acid [15][16][17][18][19]. In the textbooks, dissolution of copper in concentrated sulfuric acid is expressed by a typical reaction equation [20,21] It has been noted that along with reaction 1, the formation of black Cu 2 S deposit (reaction 3) occurs.…”

Section: Introductionmentioning

confidence: 99%

Copper Dissoliution in Concentrated Sulfuric Acid

Šulčius¹,

Griškonis²,

Žmuidzinavičienė³

2019

WJCE

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When redox reactions are studied in the chemistry course, focus is limited to the use of a series of metal activity, electron or electron-ion balance method, and writing of the reaction equations. Students find the redox reactions that occur during the dissolution of metals in acids difficult. Motivated students should be able to solve four problems while studying redox reactions: 1) indicate oxidizing agent and reducing agent; 2) write correct products forming and balance the redox reaction; 3) calculate the electromotive force E 0 of the redox reaction; 4) indicate the thermodynamic possibility of the occurrence of redox reaction by calculating Gibbs energy ∆G 0. The proposed improved methodology for studying the reactions of dissolution of metals in acids allows students to systematize and expand knowledge about redox reactions in inorganic chemistry. To improve the assimilation of knowledge about the dissolution of copper in sulfuric acid, mnemonic scheme has been proposed that makes it possible to understand better composition of the products. Copper reacted with concentrated sulfuric acid only when heated and precipitation of black deposit was observed. The amount of black deposit in the acid and on the surface of copper depended on the method and intensity of heating: heating with interruptions or intensive continuous heating. It has been determined, that during copper dissolution in concentrated 96% sulfuric acid two reactions take place (the main and the parallel) and precipitation of black deposit, consisting mainly of Cu 2 S and a small amount of Cu 2 O, is observed.

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Section: Introductionmentioning

confidence: 99%

Copper Dissoliution in Concentrated Sulfuric Acid

Šulčius¹,

Griškonis²,

Žmuidzinavičienė³

2019

WJCE

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“…In 7xxx aluminum alloys, copper is one of the alloying elements with the concentration of up to 2.0 wt.%. Several investigators have investigated the dissolution of pure copper and its properties in several acidic solutions such as sulfuric acid [1,2], hydrochloric acid [3,4], and ethylene diamine tetra acetic acid/ethylene diamine (EDTA/EDA) base solutions [5]. Several others have investigated the copper dealloying and or nucleation and growth behaviors in aluminum alloys in the presence of sodium chloride [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Determination of Copper Dissolution Activation Energy in Concentrated Hydrogen Peroxide

Sofyan

2011

AMR

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Determination of copper dissolution activation energy in concentrated hydrogen peroxide used as a decontaminant agent on aircraft has been carried out. This work was performed in conjunction with the determination of the effect of hydrogen peroxide used as a decontaminant agent on selected aircraft metallic materials. The main idea of this work was to simulate the worst possible condition, i.e. spillage of the liquid concentrate due to operator abuse or conditions where large-scale condensation of the peroxide takes place due to the failure of decontamination process control. Due to inherent properties of the chemical used as a decontaminant agent, it possibly could affect the airliner metallic materials during or after the decontamination process, particularly copper. Since copper is one of the important alloying elements in the aluminum alloys, this work was performed to get the idea how fast the process takes place and so to help understanding the subsequent corrosion process, if any, on the aircraft’s flightworthiness at least qualitatively and ideally quantitatively. The results showed that the rate of copper dissolution increased for the first 15 minutes of the reaction time with an activation energy of 19 kJ/mol, and then the fraction of copper dissolved became constant. This constant dissolution was expected to be due to the formation of copper hydroxide, which was observed to precipitate after the solution settled for some time. However, because the final consumption of hydrogen peroxide was not controlled, the exact reason for this constant dissolution cannot be determined at this time. The value of activation energy is within the range of activation energy found in the literature for other dissolution process. The low activation energy for dissolution of pure copper correlates with the observation of dissolution of copper from intermetallic particles in the aluminum alloys.

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Energy Flow Analysis of Nonlinear Dynamical Systems

Trzaska

2023

Studies in Systems, Decision and Control

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Copper Dissolution Rate as a Function of the Corroding-Surface Tilt

Cited by 3 publications

References 15 publications

Copper Dissoliution in Concentrated Sulfuric Acid

Copper Dissoliution in Concentrated Sulfuric Acid

Determination of Copper Dissolution Activation Energy in Concentrated Hydrogen Peroxide

Energy Flow Analysis of Nonlinear Dynamical Systems

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