THE ASSESSMENT OF SURFACE WEAR OF EPOXY COATINGS AGED WITH A POTASSIUM HYDROXIDE WATER SOLUTION
Journal Title: Tribologia - Year 2009, Vol 226, Issue 4
Abstract
The paper concerns the assessment of the influence of ageing with a 20% potassium hydroxide water solution on the wear of an epoxycoated surface. FTIR and X-ray examination proved intensive oxidation of the surface layers of aged coatings. Chemical structure destruction of aged coatings caused an increase of glass transition temperature Tg. As the effect of ageing, the hardness decrease of the surface layers of coatings was noticed. Moreover, oxidised surface layers showed a decreased cohesion of coating constituents. As a result of pigments and fillers released from the coating structure, craters developed on the coating surface. This essentially influenced the roughness increase of aged coatings, the more with the longer time of aggressive medium action. For example, roughness parameter Ra for 1080 h ageing increased more than 35 times. Roughness parameter Rz and waviness parameter Wt are subjected to fewer changes in all periods of ageing. Parameter Rz (equal 0.5 μm for unaged coating) increased more than twice for 1080 h ageing. However, coating waviness for the same ageing period increased over five times, i. e. from Wt = 1.15 μm for unaged coating to Wt = = 6.03 μm for the coating aged for 1080 h. Ageing changes of coating structures also contributed to the increase of coating porosity. After 1080 h of ageing, the pore volume increased by 59%. Moreover, cracks development was stated on coating surface as the result of pore consolidation. As a result of ageing, epoxy coating resistance to erosive action of alundum particles decreased, which was proved by more than twice the increase of their erosive wear intensity after ageing for 1080 h.<br/><br/>
Authors and Affiliations
Danuta Kotnarowska
Keywords
Related Articles
- EP ID EP516767
- DOI -
- Views 71
- Downloads 0
THE APPLICATION OF THE ROUGH SETS THEORY FOR THE ANALYSIS OF SURFACE ROUGHNESS FACTORS INFLUENCING SURFACE FATIGUE LIFE
Fatigue wear is a kind of wear when the local loss of cohesion and subsequent material decrements are caused by material fatigue in the effect of cyclic action of contact stresses in surface layers of joint friction elem...
Własności tribologiczne powłok stellitowych nanoszonych elektroiskrowo
ABRASIVE WEAR RESISTANCE OF METAL-POLYMER COMPOSITES
The paper presents the results of resistance to abrasive wear of various material junctions. The purpose of this study was to assess the potential application of composite materials for the regeneration of friction pairs...
TRIBOLOGICAL AND MATERIAL CONDITIONINGS OF THE HIP ENDOPROSTHESES APPLICATION
Hip joint arthroplasty is a common operation at the Orthopaedic Surgery Departments. An increasing demand for implantation of the hip joints results from: longer and longer life span, improper nutrition and increasin...
Metodyka badań materiałów i elementów endoprotez stawu biodrowego w instytucie obróbki plastycznej
Przedstawiono metodykę tribologicznych badań materiałów i elementów endoprotez stawu biodrowego. Badania prowadzone są na dwóch etapach. Etap pierwszy dotyczy oceny różnych skojarzeń materiałowych pod względem oporów ruc...