The document discusses different types of corrosion including uniform, nonuniform, stain, pitting, point, undersurface, selective, intergranular, transgranular, and extraction corrosion. It also discusses rust protection methods such as controlling the corroding medium, material selection, surface treatments like coatings, and cathodic protection. Surface treatments aim to isolate, enrich, or form inhibitor layers on the metal surface to protect against corrosion.

1. TYPE OF CORROSION
1. Uniform
corrosion
2. Nonuniform
corrosion
3. Stain corrosion
4. Pitting
corrosion
5. Point corrosion
6. Undersurface
7. Selective corrosion
8. Intergranular
corrosion
9. Transgranular
corrosion
10.Extraction
corrosion
11.Crack of corrosion

2. UNIFORM NONUNIFORM STAIN PITTING POINT
UNDERSURFACE SELECTIVE
INTERGRANULA
R
TRANSGRANULA
R
EXTRACTION CRACK

3. RUST PROTECTION
1. Form corroding medium
2. Choice of available material
3. Model solution
4. Manufacturing technology
5. Electrochemical cover
6. Surface treatment

4. SURFACE TREATMENT
 Catodic protect (e.g. zinc coatings in steel)
 We can enrich surface of metal by
alloying elements (e.g. hot chromizing,
alumining)
 Coating isolate protect surface against
corrosion medium (e.g. corrosion
protective paint and plastics, coatings
from tin in steel)
 Synthetic compound layer of protect metal
has better protective properties (e.g.
phosphated coatings in steel, oxidized
coatings in aluminium)
 layer of matter has inhibic effect for

5. https://youtu.be/o7jb6VhzhqY
https://www.youtube.com/watch?
v=x0mE5vH-xUE

6. Cathode
The negatively charged electrode by which electrons enter
an electrical device.
the positively charged electrode of an electrical device,
such as a primary cell, that supplies current.
Anode
the positively charged electrode by which the
electrons leave an electrical device.
the negatively charged electrode of an
electrical device, such as a primary cell, that
supplies current.

7. Cathode
The negatively charged electrode by which electrons enter
an electrical device.
the positively charged electrode of an electrical device,
such as a primary cell, that supplies current.
Anode
the positively charged electrode by which the
electrons leave an electrical device.
the negatively charged electrode of an
electrical device, such as a primary cell, that
supplies current.