The Effects Of Shot And Grit Blasting Process Parameters On Steel Pipes Coating Adhesion

• Main Author: Khorasanizadeh, Saeed
• Format: Text
• Language: English
• Published: Zenodo 2010
• Subjects: surface preparation; abrasive particles; adhesionstrength; permafrost
• Online Access: https://dx.doi.org/10.5281/zenodo.1062342; https://zenodo.org/record/1062342

Adhesion strength of exterior or interior coating of steel pipes is too important. Increasing of coating adhesion on surfaces can increase the life time of coating, safety factor of transmitting line pipe and decreasing the rate of corrosion and costs. Preparation of steel pipe surfaces before doing the coating process is done by shot and grit blasting. This is a mechanical way to do it. Some effective parameters on that process, are particle size of abrasives, distance to surface, rate of abrasive flow, abrasive physical properties, shapes, selection of abrasive, kind of machine and its power, standard of surface cleanness degree, roughness, time of blasting and weather humidity. This search intended to find some better conditions which improve the surface preparation, adhesion strength and corrosion resistance of coating. So, this paper has studied the effect of varying abrasive flow rate, changing the abrasive particle size, time of surface blasting on steel surface roughness and over blasting on it by using the centrifugal blasting machine. After preparation of numbers of steel samples (according to API 5L X52) and applying epoxy powder coating on them, to compare strength adhesion of coating by Pull-Off test. The results have shown that, increasing the abrasive particles size and flow rate, can increase the steel surface roughness and coating adhesion strength but increasing the blasting time can do surface over blasting and increasing surface temperature and hardness too, change, decreasing steel surface roughness and coating adhesion strength. : {"references": ["A. Qanbarzadeh, \"Surface Preparation\", first ed., Tehran, Iran, 2007.", "A. Baldan, \"Review adhesively-bonded joints and repair in metallic\nalloys polymers and composite materials: Adhesives Adhesion theories\nand surface pre-treatment\", Journal of materials science, 39, 2004, pp.\n1-49.", "NIST Special Publication 1035, \"Coatings for Corrosion Protection:\nOffshore Oil and Gas Operation Facilities, Marine Pipeline and Ship\nStructures\", April 2004, pp. 14-16.", "L. NIU, Y.F. Cheng, \"Development of innovative coating technology for\npipe line operation crossing the permafrost terrain, Construction and\nbuilding Material\", 2008, 22, pp. 417-422.", "E. Metabrasive, \"Training course blasting using wheel machines\",\nEngland, 2009.", "S.H. Leigh, C.C. Berndt, \"A test for coating adhesion on flat substratesa\ntechnical note, Journal of thermal spray technology, Vol. 3(2), June\n1994, pp. 184-190.", "International Organization for Standardization, \"Paints and Varnishes-\nPull-Off Test for Adhesion\", ISO 4624, 2004.", "A.W. Momber, Y.C. Wong, \"Over Blasting Effects on Surface\nProperties of Low-Carbon Steel\", April 2005, pp. 453-461."]}