Tham khảo tài liệu 'hydroblasting and coating of steel structures 2011 part 8', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 128 Hydroblasting and Coating of steel Structures Table Time to failure by blistering for linings Mitschke 2001 . Chloride level in pg cm2 Time to blistering in weeks at various temperatures 88 c 77 c 66 c 54 c 43 c Epoxy novolac DET 320 im 56 56 56 56 56 56 56 56 56 56 56 56 56 56 56 56 56 56 56 56 56 36 56 56 56 Epoxy. DFT 193 pm 3 26-36 56 56 56 6 26-36 56 56 56 6 26-36 56 56 56 5 26 56 56 56 2 2 4 10 56 Epoxy. DFT 239 un 36 11 12 56 56 3 7 12 56 56 3 7 56 56 3 7 56 56 3 5 3 Epoxy novolac. DFT 262 pm 56 56 56 56 56 56 56 56 56 56 56 56 56 56 56 56 56 56 56 56 56 56 56 56 56 Epoxy. DFT 252 pm 56 56 56 56 4 56 56 3 56 56 10 56 56 3 56 56 Epoxy DFT 252 pm 36 3 56 56 56 56 36 43 43-56 56 56 56 3 3 56 56 56 23 23 56 56 56 3 3 43-56 56 56 The very extensive study performed by Soltz 1991 also contains an investigation about the effect of chloride-contaminated abrasives on the coating performance. However the major criterion for salt content is the safe or permissible respectively salt level that prevents under-rusting or blistering of the applied paint system. There Surface Quality Aspects 129 Figure The effect of chloride level on blistering in coal tar epoxy coatings Soliz 1991 . Table Permissible chloride levels on steel substrates. Institution Permissible chloride content in cm2 NASA 5 US Navy non-immersion service 1 5 US Navy immersion service 1 3 NORSOK immersion service 3 2 Hempel non-immersion service 2 Hempel immersion service 2 1 Cited in Appleman 2002 . 2 Hempel Paints. 3 NORSOK Standard M-501. 1999. are different values available in the literature some are summarised in Tables and and in Fig. . It must be considered that these global values may be modified for certain applications and coating systems in those cases paint manufacturers should be .
