| 英文摘要 |
In this paper, the off shore wind turbine tower coating systems had been evaluated. The coatings include Zn-rich primer, Zn-Al and Al thermal spray, epoxy resin anti-corrosion primer. ISO 12944, NORSOK M501 test standards were followed. The results showed that all the coating systems could meet the requirements of ISO 12944. For Tai-power expectation of 40-years off shore atmospheric exposure, the anti-corrosion primer with heavier film thickness was recommended, Zn-rich primer coating performed secondly. The Zn-Al and Al thermal spray metal layers failed to establish a passive state in chloride ions contained wet salt spray condition. The dissolutions of the thermal spray coatings were faster than the other coatings, which resulted in a wider coating peeling length. However, the rust formed on the thermal spray metal layers was in red color, which indicates that the corrosion was only happened on the coating. Zn-Al and Al coating system could meet the requirements of aging test of NORSOK M501. The corrosion-resistant primer with heavier film thickness coating performed well in seawater immersion and cathodic corrosion coating test of NORSOK M501. Due to the cathodic corrosion protection potential had been designed for steel corrosion immunity, the Zn-Al and Al coating systems were found having a poor performance in the cathode corrosion coating test. It has been known that Zn-Al and Al coating are active materials, therefore the protection of exposed Zn-Al and Al layers should be insufficient for cathodic protection for wind turbine underwater structure. |
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