Effect of sealing treatment on the corrosion resistance of thermal-sprayed ceramic coatings

Effects of sealing on corrosion behaviour of plasma-sprayed Cr2O3–8TiO2 coating

“…Additionally, there are considerable limitations when an optical microscope is used to characterise the presence of artefacts (pull-out of particles as the ceramic is brittle) produced during metallographic preparation. 10 Anyhow, from the porosity results in Table 2, the same trend in porosity variation is obtained from both methods. The electrochemical method could be considered as more useful than image analysis since it allows the measurement of the coatings' effective porosity without taking into account the presence of artefacts.…”

“…Since the porosity determined from the electrochemical data represented the connected porosity of the coating, 10 it could be observed that more than 91% of such porosity was sealed in this case. Comparing the porosity of the epoxy resin-sealed coating with that of the silicone resinsealed coating, the porosity is sealed more effectively in the latter case.…”

Effect of Sealing Materials and Parameters on the Corrosion Resistance of HVOF-Sprayed CrC-NiCr Coatings

“…. 또한 인산, 페놀 및 에폭시 계열의 실링재를 플라즈마 용사된 Al 2 O 3 -13%TiO 2 코팅에 적용한 결과, 페놀과 에폭시 계열 의 실링재가 인산보다 우수한 실링특성을 보인 결 과도 보고된 바 있다 15) . 지금까지의 연구결과를 종합해 보면 실링재의 종 류에 따른 침투깊이를 관찰하여 코팅의 내식성에 미치는 영향, 또는 실링처리가 코팅의 경도 9,14) , 내 마모성 9,11,18) , 밀착력 9,11,19) , 표면 거칠기 …”

Microstructure, Corrosion, and Fatigue Properties of Alumina-Titania Nanostructured Coatings

“…Because of their lamellar structure, ceramic coatings usually are characterized by a relatively high open porosity and incomplete bonding between lamellae, which are detrimental when the coatings have to perform in an aggressive environment. The porosity allows a path for electrolytes from the outer surface to the substrate [10,11].…”