CORROSION. CONTENTS. Introduction Forms of Corrosion Uniform Corrosion Pitting Corrosion Stress Corrosion Cracking Crevice Corrosion Erosion Corrosion Intergranular Corrosion Hydrogen Damage Corrosion Fatigue
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
Corrosion produced by the development of a current in an electrochemical cell that removes ions from the material.
Degradation of metals and is often called RUST
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.
Intergranular SCC Of An Aluminum Aerospace Part
Changes in alloy heat treatment recommended
Corrosion occurs at the tip of a crevice because of limited access to oxygen.
In austenitic stainless steel, precipitation of chromium carbide makes the low Cr austenite in the grain boundaries anodic.
Example of microgalvanic cells in two-phase alloys :
In steel, ferrite is anodic to cementite
Hydrogen Embrittlement of Valve Capscrew Fasteners
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
Corrosion occurs beneath a water droplet on a steel plate due to low oxygen concentration in the water.
Photomicrograph of a copper deposit in brass, showing the effect of dezincification (x50).