316 L不锈钢表面氧化物复合涂层的制备和阻氢性能研究

Preparation and hydrogen barrier properties of oxide composite coatings on 316 L stainless steel surfaces

为提高涉氢部件在高温高压下的阻氢渗透性能,采用浆料法-高温熔烧法在316 L不锈钢表面制备不同含量的α-Al_(2)O_(3)、La_(2)O_(3)、SiO_(2)金属氧化物复合陶瓷涂层。选用扫描电镜(SEM)、X射线衍射(XRD),以及X射线能谱(EDS)等手段对氧化物陶瓷涂层的表面形貌、相结构、表面成分等进行表征,并采用气体驱动渗透装置对其进行氢渗透性能测试。结果表明,该涂层制备工艺简单,可涂覆于复杂结构器件内外表面,制备出的涂层均匀、致密度高;随着温度的升高,涂层对氘的渗透阻挡性能几乎没有改变,在650℃时,涂层中氧化物含量为20%的阻氢因子(PRF)达到295左右,或涂层中氧化物含量为15%的PRF达到512左右时,均表现出最优的阻氢性能。

In order to improve the hydrogen permeation resistance of stainless steel under high temper-ature and high pressure in nuclear reactors,composite ceramic coatings of differentα-Al_(2)O_(3),La_(2)O_(3),SiO_(2),metal oxides were prepared on the surface of stainless steel using the slurry method and high-temperature melting method.The surface morphology,phase structure,and surface composition of ox-ide ceramic coatings were characterized by scanning electron microscopy(SEM),X-ray diffraction(XRD),and energy dispersive X-ray spectroscopy(EDS).The hydrogen permeation performance of the coatings was tested using a gas-driven permeation device.The results indicate that the coating preparation process in this work is simple and can be applied to the surfaces of complex structural components.The coating has high uniformity and density.With increasing temperature,the hydrogen permeation resistance of the coatings to deuterium kept constant.At 650 C,the permeation resistance factor(PRF)for coatings with an oxide content of 20%was around 295,while coatings with an oxide content of 15%achieved a PRF of approximately 512,demonstrating optimal hydrogen permeation re-sistance.