Wpływ czynników eksploatacyjnych na zużycie erozyjne powłok epoksydowych

• Autorzy: Kotnarowska D.

Warianty tytułu

EN

Influence of environment factors on the resistant to erosive wear of the epoxy coatings

• Języki publikacji: PL

Abstrakty

PL

W artykule zawarto ocenę (na podstawie badań modelowych) wpływu czynników eksploatacyjnych w postaci promieniowania ultrafioletowego, jak również mediów agresywnych (wodnych 20% roztworów kwasu siarkowego, wodorotlenku potasu lub chlorku sodu) na: pękanie, pęcherzenie, porowatość, a także chropowatość powierzchni powłok epoksydowych. Ustalono, że zużycie warstw powierzchniowych powłok epoksydowych pod wpływem starzenia, a także zwiększenie ich porowatości są przyczyną znacznego obniżenia odporności erozyjnej powłok.

EN

The paper presents (on the basis of the model research) an influence evaluation of environmental hazards like ultraviolet radiation and aggressive media (20% water solutions of sulphuric acid, natrium chloride and potassium hydroxide) on the destruction (cracking, blistering, porosity, roughness increase) of epoxy coatings. Under the action of sodium chloride, sulphuric acid or potassium hydroxide aqueous solutions as well as ultraviolet radiation, epoxy coatings underwent both chemical and physical (cracking, blistering, increased porosity and surface roughness) destruction. It results from rentgenographic investigations that epoxy coatings undergo oxidation under the action of these media. The highest oxidation level showed coatings aged with ultraviolet radiation. The action of aggressive media caused the cracking of epoxy coating surface layers. Sulphuric acid action caused additionally significant coating blistering. In the case of ageing with ultraviolet radiation, so-called "silver" cracks (typical for this ageing kind) were generated on the coating surface. Oxidised coating layers showed increased brittleness that caused the deterioration of the bonding strength of pigments and fillers with polymer matrix. In the next stage, pigments and fillers were crumbled up from surface layers. This resulted in a significant increase of surface roughness of the aged coatings. For instance, the value of the surface roughness parameter Ra increased over 25 times for a coating aged with ultraviolet radiation for 1008 hours. Polymeric coating destruction under the action of environmental factors - as a result of their cracking, blistering and surface roughness increase - decreases the coating tightness. Surface roughness increase causes a decrease of coating gloss that deteriorates coating decorative properties. Loss of coating tightness and decorative properties decreases the service life of coating. Wear resulting from ageing of epoxy coating surface layers as well as from coating porosity increase is the reason of essential decrease of their resistance to erosive wear. Destruction of coatings under the influence of ultraviolet radiation leads to the greatest decrease of coatings resistance to erosive wear reaching amount of 57% for 1320 h of ageing. The decrease of resistance to erosive wear for other types of coating was from 34% for ageing with 20% aqueous solution of potassium hydroxide to 51% for ageing with 20% aqueous solution of sodium chloride.

Słowa kluczowe

PL

destrukcja powłok epoksydowych; pękanie; pęcherzenie; porowatość; chropowatość powierzchni; odporność erozyjna

EN

destruction of epoxy coatings; cracking; blistering; porosity; surface roughness; resistance to erosive wear

• Wydawca: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
• Czasopismo: Tribologia
• Rocznik: 2008
• Tom: nr 2
• Strony: 321--332
• Opis fizyczny: Bibliogr. 25 poz., rys.

Twórcy

autor

Kotnarowska D.

• Politechnika Radomska, Wydział Mechaniczny, Instytut Eksploatacji Pojazdów i Maszyn, ul. Bolesława Chrobrego 45, 26-600 Radom

Bibliografia

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