ABSTRACT

To reduce the destruction of organic biological fouling in marine steel, nickel-based (NiCrAlY) transition coatings with and without silver (Ag) doping were prepared on AH32 marine steel by plasma spraying. The coatings exhibited a layered structure, and AlNi₃ (111), (200), and (220) diffraction peaks were detected. The Ag (111) peaks were also observed for the Ag-doped coatings. The number of sulphate-reducing bacteria (SRB) adsorbed on the coating surfaces reduced after immersion in the bacterial solution, and their shells were disintegrated because of the presence of Ag. The corrosion potentials of AH32, NiCrAlY, and NiCrAlY(Ag) coated AH32 plates were nearly identical at approximately −720 mV. After being covered with organic paint, the corrosion potential and current density of the NiCrAlY(Ag) coating increased to −624 mV and decreased by one order of 2.75 × 10⁻⁶ A cm⁻², respectively. The NiCrAlY(Ag) coating effectively inhibited biological fouling.

摘要

为了减少船用钢中有机生物污垢的破坏，采用等离子喷涂方法在AH32船用钢上制备了掺杂和不掺杂银（Ag）的镍基（NiCrAlY）过渡涂层。涂层呈层状结构，AlNi ₃检测到(111)、(200)和(220)衍射峰。还观察到 Ag 掺杂涂层的 Ag (111) 峰。浸泡在菌液中后，吸附在涂层表面的硫酸盐还原菌（SRB）数量减少，并且由于Ag的存在，其外壳被解体。AH32、NiCrAlY 和 NiCrAlY(Ag) 涂层 AH32 板的腐蚀电位几乎相同，约为 -720 mV。覆盖有机涂料后，NiCrAlY(Ag)涂层的腐蚀电位和电流密度分别增加至-624 mV和降低了一个数量级2.75 × 10 - ^{6 A}  cm ^-2。NiCrAlY(Ag)涂层有效抑制生物污垢。