Abstract
When steel structures exposed to atmospheric environment are repainted, corrosion product containing chloride tends to be left on the surface. As a results, under-film corrosion will occur in an early stage after the repainting. In author's previous studies, an anticorrosive method with Al-Zn sacrificial anode material and fiber sheet which has functions of continual water absorption and retention has been developed as anticorrosive method without a high quality surface preparation. The purpose of this research is to investigate the anticorrosive effect and practicability of the developed anticorrosive method. Tensile strength tests were carried out on deteriorated Al-Zn sacrificial anode plates to clarify the mechanical properties. In addition, atmospheric exposure tests were conducted on the model specimens with the anode plate holes of various diameter and arrangement to quantitatively evaluate the influence of alloy composition of casting plate and water-absorbing route on current efficiency of the anode material. Furthermore, the practicability was also investigated by applying the method to hot-rolled H-section steel that simulated an actual structure and a steel I-section girder bridge of which almost paint coating has deteriorated and disappeared.
