CORROSION
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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

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Corrosion

CORROSION


Corrosion

CONTENTS

  • Introduction

  • Forms of Corrosion

    • Uniform Corrosion

    • Pitting Corrosion

    • Stress Corrosion Cracking

    • Crevice Corrosion

    • Erosion Corrosion

    • Intergranular Corrosion

    • Hydrogen Damage

    • Corrosion Fatigue

    • Concentration Cell Corrosion

    • Fretting Corrosion

    • Dealloying

    • Corrosion in Concrete


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Electrochemical cell

A cell in which electrons and ions can flow by separate paths between two materials, producing a current which, in turn, leads to corrosion or plating.

The components in an electrochemical cell


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Electrochemical corrosion

Corrosion produced by the development of a current in an electrochemical cell that removes ions from the material.

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Degradation of metals and is often called RUST


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Examples

Car Corrosion


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Corrosion of Implants


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Portion Of Different Forms Of Corrosion


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Uniform Corrosion


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Pitting Corrosion


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Stress Corrosion Cracking

Examples of stress cells

Cold work required to bend a steel bar introduces high residual stresses at the bend, which then is anodic and corrodes.


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Because grain boundaries have a high energy, they are anodic and corrode.


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River Branching Pattern


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The arrows indicate the primary crack shown in both pictures

Intergranular SCC Of An Aluminum Aerospace Part

Changes in alloy heat treatment recommended


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Crevice Corrosion

Corrosion occurs at the tip of a crevice because of limited access to oxygen.


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Erosion Corrosion


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Intergranular Corrosion

In austenitic stainless steel, precipitation of chromium carbide makes the low Cr austenite in the grain boundaries anodic.


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  • Exfoliation Corrosion


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Galvanic Corrosion

Example of microgalvanic cells in two-phase alloys :

In steel, ferrite is anodic to cementite


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Hydrogen Damage

Hydrogen Embrittlement of Valve Capscrew Fasteners


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Corrosion Fatigue


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Corrosion Fatigue Cracks In AISI 1020 Steel In Oil And Gas Downhole Service

Corrosion fatigue cracks on the I.D. of a Admiralty brass exchanger tube


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Concentration Cell Corrosion

Corrosion occurs beneath a water droplet on a steel plate due to low oxygen concentration in the water.


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Fretting Corrosion


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Dealloying


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Photomicrograph of a copper deposit in brass, showing the effect of dezincification (x50).


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Filiform Corrosion


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Corrosion in Concrete


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THANK YOU FOR YOUR KIND ATTENTION


Corrosion

  • References :

  • http://corrosion.ksc.nasa.gov

  • http://www.corrosion-doctors.org

  • http://www.hghouston.com

  • The Science and Engineering of Materials, 4th ed Donald R. Askeland – Pradeep P. Phuile’


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