CAJ | 학술논문

采用化学沉积法在 AZ31镁合金基体表面制备了钙磷涂层。利用 X 射线衍射仪和扫描电镜分析了涂层的相组成和形貌。通过电化学噪声技术原位研究了涂层的化学沉积过程及其在生理盐水中腐蚀行为。结果表明，经过3 h 的化学沉积可在 AZ31基体上生成致密的二水合磷酸氢钙（DCPD）晶体涂层。涂层试样的腐蚀速率明显小于AZ31基体的腐蚀速率。AZ31基体在生理盐水中在较短的时间内会发生明显的局部腐蚀，腐蚀形态是以分散分布的多个腐蚀点的形式出现。涂层试样在生理盐水中经较长时间浸泡会发生局部腐蚀，腐蚀沿着打磨痕迹的方向发展，同时先前的局部腐蚀区域则停止发展。
채용화학침적법재 AZ31미합금기체표면제비료개린도층。이용 X 사선연사의화소묘전경분석료도층적상조성화형모。통과전화학조성기술원위연구료도층적화학침적과정급기재생리염수중부식행위。결과표명，경과3 h 적화학침적가재 AZ31기체상생성치밀적이수합린산경개（DCPD）정체도층。도층시양적부식속솔명현소우AZ31기체적부식속솔。AZ31기체재생리염수중재교단적시간내회발생명현적국부부식，부식형태시이분산분포적다개부식점적형식출현。도층시양재생리염수중경교장시간침포회발생국부부식，부식연착타마흔적적방향발전，동시선전적국부부식구역칙정지발전。
A calcium phosphate coating was prepared on AZ31 magnesium alloy surface by chemical deposition.The morphology and phase constitution of the coating was analyzed by scanning electron microscopy and X-ray diffractometer.The chemical deposition process and corrosion behavior of the coating in normal saline was in-situ investigated by electrochemical noise technique.The results showed that a compact calcium hydrogen phosphate dihydrate (DCPD)coating was formed on AZ31 substrate after deposition for 3 h.The corrosion rate of the coated sample was obviously less than that of AZ31 substrate.Localized corrosion occurred on AZ31 substrate in a short period and several pits were observed.It took relative long time for the coated sample to suffer localized corrosion. Corrosion developed along the grinding trace,meanwhile the initial corrosion area stoped to develop.