The PITfalls of not sealing and protecting can be costly! 😱 Understanding the nuances of pitting corrosion is vital in safeguarding metal integrity. This post elaborates on the two classifications of pitting corrosion—trough and sideway pitting—each with distinct factors influencing their formation. Learn how these corrosion types affect structural elements and the challenges in their detection.

1. Types of
THAT YOU SHOULD KNOW OF
PITTING
CORROSION
7

2. Pitting corrosion is categorised into two categorisation
trough pitting corrosion and sideway pitting corrosion,
each with distinct factors and criteria governing their
formation.

3. Trough Pitting Corrosion
Forms hemispherical, cup-shaped, or irregular pits
when the protective film on the metal wall is
compromised. This corrosion swiftly penetrates
through the material thickness, impacting structures
like roof sheets, trusses, or gutter systems.

4. Types of Trough Pits
NARROW, DEEP WIDE, SHALLOW
ELIPTICAL
VERTICAL,
GRAIN ATTACK
1 2
3 4

5. Sideway Pitting Corrosion
Creates pits covered by a semi-permeable rust layer,
characterised by horizontal grain attack and
challenging detection as the surface appears
unaffected despite swift metal penetration.

6. Types of Sideway Pits
SUBSURFACE UNDERCUTTING
HORIZONTAL
5 6
7

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Pitting Corrosion
Problem?

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