tailieunhanh - Volume 13A - Corrosion Fundamentals, Testing, and Protection Part 14

Tham khảo tài liệu 'volume 13a - corrosion fundamentals, testing, and protection part 14', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | these standards are essentially the same however each standard specifies a different design and dimeni substrate that is the diameter varies from to 40 mm 1 to in. and the length is from to 50 m to in. . The TAT arrangement involves attaching a support fixture to the coated specimen with an epoxy so th tensile force may be applied. The stress at failure is calledzihfe adhesion strength or bond strength and is an important property to characterize coatings. However there are some shortcomings of the TAT procei such as variations in the penetration of epoxy and in the alignment of test fixtures. The mixed mode of fai may also occur and this makes the interpretation of results difficult. The adhesion strength or cohesion strength can be influenced by many factors. Some of them are intrinsic is related to the spray variables such as powder characteristics spray parameters substrate preparation forth. The others are extrinsic which include post-treatment and service conditions. However adhesion are usually performed at room temperature under laboratory conditions on witness samples and do I consider in-service conditions that may decrease the adhesion strength. It is important for materials design keep in mind that the adhesion strength is highly related to service conditions. As well the confidence-inte estimation for such coatings enables the reliability of the so-determined property to be ascertained. The measurement of adhesion of thermal spray materials is at least on the conceptual level a routine opei The tensile adhesion method as detailed in ASTM c 633 is simple and often used in industry for rani different coatings. However the major shortcoming of this test is that it does not promote any understand coating performance that is how coatings can be designed to be more functional. References cited in this section . Berndt s. Reddy and . Allan Optimization of Thermal Spray Parameters for Cathoc Protection of Reinforcement in Concret .