Taber abrasive wear resistance of organic offshore wind power coatings at varying normal forces

Abstract

Thirteen organic coatings with three base polymers (epoxy, polysiloxane, polyurethane) were tested in a load-controlled Taber abrasion tester at different normal force levels (2.5 to 25 N). Abrasive wear functions, as well as two partial abrasive wear resistance coefficients, were estimated. Results of scanning electron microscopy (SEM) investigations indicated that both plastic deformation mechanisms and fracture mechanisms caused material removal during the abrasive wear of the materials. The predominant and rate-controlling mechanism depended on normal force and polymer type. Abrasive wear in terms of coating layer thickness loss, as well as the probability of fracture/cracking-based material removal mechanisms, increased with increasing normal force. The ranking of abrasive wear resistance was as follows: epoxy > polysiloxane > polyurethane. The relationship between abrasive wear and normal force followed a power law with power exponents between 0.45 and 1.4. The power exponents were found to depend on the polymer types. The type of polymer was very important for low normal forces, whereas the importance of polymer variation vanished for the higher normal forces.

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Abbreviations

a, b:

Abrasive wear function constants

d1, d2 :

Abrasion path diameters

FN :

Normal force

FNc :

Threshold normal force for microfracturing

h0 :

Initial coating thickness

HC :

Coating material hardness

HM :

Material hardness

hN :

Coating thickness after abrasive wear

HP :

Polymer material Vickers hardness

K, K1, K2 :

Abrasive wear resistance parameters

KIc :

Mode-I fracture toughness

N:

Number of abrasion cycles

VA :

Volume removed due to abrasive wear

β:

Geometry parameter

Δh:

Coating layer thickness loss due to abrasive wear

Ψ:

Constant

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Acknowledgments

The investigations were funded by the German Federal Ministry of Education and Research (BMBF) in the frame of the innovation initiative “Wachstumskerne—Unternehmen Region,” sub-program: “OWS-MV: Offshore Wind Solutions-Mecklenburg-Vorpommern.” Thanks are given to Fraunhofer IFAM, Bremen, Germany, where the hardness measurements were performed. Thanks are also addressed to Kathrin Hasche of Fraunhofer IGP, Rostock, Germany, who conducted the SEM inspections.

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Momber, A.W., Irmer, M. Taber abrasive wear resistance of organic offshore wind power coatings at varying normal forces. J Coat Technol Res (2021). https://doi.org/10.1007/s11998-020-00437-x

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Keywords

  • Coatings
  • Durability
  • Offshore
  • Polymers
  • Taber test