Investigation into the Abrasion Resistance of Polyurea Coating by the Taber Abraser

• Main Author: Azmal Khuzairi Bin Abdul Wahab, Azmal Khuzairi
• Format: Final Year Project
• Language: English
• Published: Universiti Teknologi Petronas 2010
• Subjects: TJ Mechanical engineering and machinery
• Online Access: http://utpedia.utp.edu.my/1467/1/Azmal_Khuzairi_Abdul_Wahab_11044_ME_Dissertation.pdf; http://utpedia.utp.edu.my/1467/

Polyurea coatings is a relatively new class of industrial coating, usually applied by spray using specialised equipment and characterised by extremely fast drying and high performance. Polyurea’s strength are tailored to fill the gaps left traditional coating products used in the oil and gas industry and is the ideal coating product for the oil and gas industry’s especially for pipelines. The abrasion wear resistance for this coating is highly demanded and it relate with the surface preparation which is one of the main focus to maintain the abrasive wear resistance. To achieve good coating, steel substrate must have proper roughness in order to provide an increased effective surface area for mechanical bonding. This roughness, also known as anchor pattern or surface profile, forms micro pattern of peaks and valleys at the surface, which can be obtained via solvent cleaning methods and hand and power tool methods when an abrasive blast cleaning is not practical due to limited accessibility. The objective of the project is to determine the abrasion wear resistance of the polyurea coating and the next objective is to vary the different kind of surface preparation with the surface roughness on the coating. The abrasion resistance is determining by using Taber Abraser Machine and also using with the surface profiler machine to get the data for the surface roughness. The test is done according to the standard which is ASTM D 4060-95: Standard Test Method for Abrasion Resistance of Organic Coatings by Taber Abraser. From the data collected, it is observed that the two different surface preparations which is by Hand and Power Tool, St 3 and by Solvent Cleaning, SP 1; show some variation that effect on the abrasion wear resistance. This observation is based on the surface roughness that gives the data for average roughness on the surface, Ra. An essential feature of any coating system is the bond between the coating and the substrate. For successful coatings, the substrate surfaces needs to rough and pitted to provide a “foot-hold” (Splat-Hold) for each splat of coating that impacts the substrate.