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采用微弧氧化技术,以7N01铝合金为基材,在铝酸盐体系电解液中制备出MAO陶瓷层,并研究了该涂层微观形貌及相关的生长规律。结果表明,涂层表面分布着大量火山口形态的放电孔洞,周围堆积覆盖着重新凝固的氧化物,以及由于内应力所引起的微裂纹。氧化初期陶瓷层生长速率较快,随氧化时间的延长,陶瓷层的厚度逐渐增加,当氧化时间超过30 min时,陶瓷层的生长速率降低。在恒压条件下,微弧氧化过程的电流密度均很快达到峰值再随陶瓷层厚度增加而下降。
The micro-arc oxidation technology was used to prepare the MAO ceramic layer in the electrolyte of aluminate system with 7N01 aluminum alloy as substrate, and the microstructure and the related growth rules of the coating were studied. The results show that a large number of volcano-shaped discharge holes are distributed on the surface of the coating, and the re-solidified oxide is accumulated around the coating and micro-cracks caused by the internal stress. The initial growth rate of the ceramic layer is faster. With the extension of the oxidation time, the thickness of the ceramic layer gradually increases. When the oxidation time exceeds 30 min, the growth rate of the ceramic layer decreases. Under the condition of constant voltage, the current density of MAO rapidly reaches the peak and then decreases with the increase of ceramic layer thickness.