Corrosion II

Sep 21, 2012

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Corrosion II / Objectives. Define activation polarization and concentration polarization.Explain galvanic corrosion.. Corrosion II / Objectives. Define activation polarization and concentration polarization.Explain galvanic corrosion.Describe basic general rules for good corrosion preventing des

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Corrosion II

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Corrosion II

Corrosion II. Oxidation- Protective Oxide Films. Oxides form on metals due to reaction with air . Degree to which oxide films form depends on following factors. Volume ratio of oxide to metal consumed after oxidation should be close to 1. Good adherence.

914 views • 15 slides

Corrosion

Corrosion. Chapter 1.9-1.10. What is corrosion? (1.9). Corrosion is the slow chemical change that occurs when a metal reacts with oxygen from the air. This chemical reaction forms a new substance called an oxide. Different kinds of corrosion: Rusting Aluminum corrosion Silver tarnish.

721 views • 8 slides

Corrosion

Corrosion. When a metal corrodes it loses electrons and forms positive metal ions. When iron metal corrodes it forms an Iron oxide layer, which is better known as rust. Only Iron rusts all other metals corrode. Two factors are required for Corrosion .

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CORROSION

CORROSION. Rusting of iron is the commonest form of corrosion. It is the process that gradually destroys motor car bodies, steel bridges and other structures and iron roofing and guttering. R ust is the reddish-coloured, flaky or porous deposit that forms on exposed

797 views • 15 slides

Corrosion

Corrosion . What constitutes an anode/cathode pair?. In summary– Anything that makes two half-cells different gives anode & cathode ––> corrosion. We can call these types macro cells. Corrosion . Then what about micro cells? anode & cathode within single material

450 views • 18 slides

CORROSION

CORROSION. INTRODUCTION THERMODYNAMICS OF CORROSION KINETICS OF CORROSION GALVANIC CORROSION CORROSION PROTECTION. INTRODUCTION. Corrosion – from Latin “to gnaw” Corrodere – “to gnaw to pieces”. Corrosion is the degradation of a metal by electrochemical reaction with its environment.

1.23k views • 22 slides

Corrosion

Corrosion. Today’s Lesson. What is corrosion and how can it be prevented. Corrosion Questions Start Write Up for Design Task Finish Ore Questions. Corrosion. When a metal is attacked by air, water, or other substances in its surroundings, the metal is said to corrode.

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Corrosion!

Corrosion!. By: Sarah Stallings. Problem. Out of Rubbing Alcohol, Peroxide, Lemon Juice, and Vinegar what cleans corroded pennies the best?. Introduction.

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Corrosion

galvanized electrical conduit. Corrosion. -- spontaneous redox reactions in which a metal reacts with some substance in its environment to form an unwanted compound . -- For some metals (e.g., Al and Mg)… . a protective oxide coating (Al 2 O 3 , MgO) prevents further

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Corrosion

Corrosion. By Ross James and Alex. Corrosion- What is it?. Corrosion comes from the Latin word “ Corrodere ” and means “To gnaw ”.

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Corrosion

Corrosion. Formation of Oxides. Corrosion:. The chemical reaction which occurs between a metal and oxygen which results in the formation of a new substance called an oxide. There are both positive and negative forms of corrosion. Negative Corrosion:. commonly known as RUSTING

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Corrosion

Corrosion. What Causes It and What Prevents It ?. What is Corrosion ?. Corrosion is an electrochemical reaction. The corrosion of metals is an example of an oxidation-reduction reaction, or also referred to as a “redox reaction.”. What is a redox reaction?.

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Corrosion

Corrosion. Corrosion is the disintegration of an engineered material into its constituent atoms due to chemical reactions with its surroundings. There are factors that accelerate corrosion, such as, water, salts and other pollutants. Rust.

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CORROSION

CORROSION. The University of Technology Brno, School of chemistry. 20.4.2005 Pavel Haška. Something about corrosion. When was rust define? In 30th years 20th century. What´s heart of corrosion? Physical-chemical destruction of materials by ambient enviroment.

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CORROSION:-

CORROSION:-. TYPES EFFECTS & PREVENTION PRESENTED BY: GAUTAM AHUJA 1207535 . What is Corrosion ?.

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Corrosion

Corrosion. What is corrosion?. In general Corrosion is the deterioration of a material by electrochemical reaction with its surrounding environment

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CORROSION

CORROSION. CONTENTS. Introduction Forms of Corrosion Uniform Corrosion Pitting Corrosion Stress Corrosion Cracking Crevice Corrosion Erosion Corrosion Intergranular Corrosion Hydrogen Damage Corrosion Fatigue

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Corrosion

Corrosion. Degradation 0f a metal due to reaction with its environment Impairs function and appearance of component. Electrochemical Cell. Anode: oxidizes; corrodes Cathode Electrical connection Electrolyte. Reactivity. Concentration of reactants Temperature Catalysts.

694 views • 32 slides

Corrosion

Corrosion. What constitutes an anode/cathode pair?. In summary– Anything that makes two half-cells different gives anode & cathode ––> corrosion. We can call these types macro cells. Corrosion. Then what about micro cells? anode & cathode within single material

363 views • 18 slides

Corrosion

Corrosion. Objectives Corrosion process Environmental factors Common forms of corrosion Methods of corrosion control and prevention. Dr Suban K Sahoo MSc, NET (JRF), PhD. Metal Corrosion. “The destruction of a material by chemical or electrochemical reaction to its environment”

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Corrosion

Corrosion. Intermediate 2 Unit 3(c). WHAT IS CORROSION?. Potassium. When the surface of a metal changes from being an element into a compound The surface goes from being shiny to dull Nearly all metals corrode They don’t all corrode at the same rate Suggest a metal which does NOT corrode.

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CORROSION

CORROSION. INTRODUCTION. The word corrosion is as old as the earth, but it has been known by different names. Corrosion is known commonly as rust, an undesirable phenomena which destroys the luster and beauty of objects and shortens their life.

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