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Coatings

How to choose the Best Coating System

For selecting the most appropriate coating system, different criteria should be taken into consideration, such as:

  • Maintenance type and strategy (predictive or corrective)
  • Wear resistance and thickness of coatings
  • Mechanical properties of coatings (pressure, impact, temperature)
  • Corrosion resistance of coatings
  • Surface position during the coating procedure
  • Amount of heat input during coating
  • Necessity for preheating or postheating
  • Repairability of coatings

Price/efficiency ratio, economic priorities and specific needs are other important criteria for decision making.
Furthermore, for repair coating it is of interest to know if dismantling is necessary or if in situ repair is possible.

Coating selection:

Procedure for coating selection
Procedure for coating selection

Wear mechanisms

  • Friction / adhesion
  • Abrasion

Abrasion
Abrasion

  • Erosion

Erosion: Heavily worn Pelton wheel
Erosion: Heavily worn Pelton wheel

  • Cavitation

Cavitation: Agitator propeller
Cavitation: Agitator propeller

  • Surface fatigue

Surface Fatigue: Tread of wheel (railway)
Surface Fatigue: Tread of wheel (railway)

  • Combined wear

Combined wear: Hot working die
Combined wear: Hot working die

Systematic wear analysis

  • Design properties
  • Base body (initial stage)
  • Opposing body / Intermediate body
  • History
  • Base body (final stage)
  • Special parameter / properties

Corrosion mechanisms

Different types of corrosion
Different types of corrosion

  • Wet corrosion - without mechanical stress

Uniform corrosion
Uniform corrosion

Crevice corrosion
Crevice corrosion

Pitting corrosion
Pitting corrosion

  • Wet corrosion - with mechanical stress

Stress corrosion,<BR>
 Microsection
Stress corrosion,
Microsection

  • Chemical

High temperature corrosion<BR>
 combined with erosion,<BR>
 Stainless steel,<BR>
 Drying plant - Cement work
High temperature corrosion
combined with erosion,
Stainless steel,
Drying plant - Cement work

Hardness test

The hardness tester forces a small sphere (Brinell, HB), a diamond pyramid (Vickers, HV) or a cone (Rockwell C, HRC) into the surface of a metallic material.

Hardness tests
Hardness tests

Tensile strength
N/mm2
  Vickers
HV
  Brinell
HB
  Rockwell C
HRC
720   225   214   ---
800   250   238   22.2
880   275   261   26.5
985   300   285   29.8
1125   350   333   35.5
1290   400   380   40.8
1485   460   437   46.1
1665   510   ----   49.8
1845   560   ----   53.0
2039   610   ----   55.2
2180   650   ----   57.8
------   700   ----   60.1
------   800   ----   64.0
------   900   ----   67.0

Thermal conductivity

Thermal conductivity
Thermal conductivity

For further information, on-site training, technical advise or project management, please do not hesitate to contact us.

Last update: September 7, 2015

All information is supplied in good faith and without prejudice.
Wear-Management provides all information without any warranty.
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Verbatim copying and distribution of this entire document is permitted in any medium, provided this notice is preserved.