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Suggestion of Deterioration Curve for New-type Coating on Atmospheric Environment by Acceleration Corrosion Test

부식촉진 실험을 통한 대기환경에서 신설 도장계의 노화곡선 제안

Jeong, Young-Soo;Kim, Min-Jeong;Jeon, Seok-Hyeon;Ahn, Jin-Hee;Kim, In-Tae
정영수;김민정;전석현;안진희;김인태

  • Received : 2018.11.22
  • Accepted : 2019.01.27
  • Published : 2019.03.01

Abstract

In this study, to propose the deterioration curves of urethane, ceramic, polysiloxane and fluorocarbon coating for the steel bridge, an accelerated corrosion tests were carried out. The each coating system wes applied on the top of the specimens, and circular initial defects were introduced with different diameters with 0.5, 1.0, 3.0, 5.0 mm. An accelerated corrosion test condition was used to simulate severe corrosive environment depending on ISO 20340. The deterioration curve of each coating type was evaluated based on deteriorated area from the circular defects. In order to evaluate the coating service life of installed steel bridge using deterioration curve, the acceleration coefficient was calculated at correlation between ISO 20340 and corrosivity categories by ISO 9223 based on field corrosion rate. From test results, the propagation rate of coating deterioration area was different to diameter of circular defects. In case of urethane coating, the coating service lifes of 3% deterioration area was evaluated in 31.8, 15.8, 9.9 and 3.9 years with C2, C3, C4 and C5 category.

Keywords

Accelerated corrosion test;Steel bridge coating system;Acceleration coefficient;Coating service life

Acknowledgement

Supported by : 한국연구재단