Yanjin Lu
材料科学技术（英文）
A biodegradable Ca-P coating mainly consisting of β-tricalcium phosphate (β-TCP) was fabricated on pure magnesium via the chemical deposition in a simulated Hank0s solution. The method significantly accelerated the coating formation on magnesium. Moreover, the morphology, phase/chemical composition, the coating formation mechanism as well as degradation behavior in phosphate buffered saline (PBS) solution were investigated. Scanning electron microscopy (SEM) images showed that the coating had three layers and X-ray diffraction (XRD) patterns showed that the coating mainly contained Ca3(PO4)2 and (Ca,Mg)3(PO4)2. Electrochemical test showed that the corrosion current density (Icorr) of the coated Mg was decreased by about
one order of magnitude as compared to that of pure magnesium. The immersion test indicated that the coating could obviously reduce the degradation rate.
关键词:
Magnesium
王朋
,
刘宏
,
吕媛媛
,
姜魁经
表面技术
doi:10.16490/j.cnki.issn.1001-3660.2015.10.002
目的：研究化学沉积Ni-4.11%Mo-6.50%P和Ni-9.19%P合金镀层退火晶化转变特征,通过定量表征镀层的晶化程度、晶粒尺寸及结晶相的质量分数,建立显微组织与耐蚀性的关联。方法采用XRD衍射技术和Jade软件分析,定量表征镀层的晶化组织特征,由SEM/EDS测试确定镀层的成分及表面形貌,通过浸泡腐蚀实验及金相显微观察,对比两种镀层的耐蚀性。结果 Ni-Mo-P镀层在低于400℃退火时,只有Ni相结晶；在≥400℃退火时,发生Ni3 P晶化反应,同时伴有Ni-Mo固溶体的形成,600℃时的晶化程度为88.13%。相比之下,Ni-P镀层中Ni3 P相开始析出的温度降至300℃,600℃时的晶化程度达到91%。在相同温度进行热处理时,Ni-Mo-P镀层晶粒尺寸小于Ni-P镀层。在发生Ni3 P晶化反应的温度下,两种镀层中Ni3 P的晶粒尺寸总是大于Ni相。在0.5 mol/L的H2 SO4中,对于Ni-Mo-P镀层,除300℃外,其他温度下的热处理均能显著改善其耐蚀性；而对于Ni-P镀层,镀态下具有最好的耐蚀性能。在10%的HCl溶液中,退火温度为600℃时,Ni-Mo-P镀层的耐点蚀性能更好；而Ni-P合金则相反,镀态及低温200℃退火后的耐点蚀性能最好。结论 Mo的共沉积提高了Ni-Mo-P镀层Ni3 P的析出温度,降低了镀层的晶化程度及晶粒尺寸；与Ni-P镀层相比,高温退火的Ni-Mo-P镀层表现出了优异的耐点蚀性能,但耐硫酸均匀腐蚀的性能较差。
关键词:
化学沉积
,
Ni-Mo-P镀层
,
Ni-P镀层
,
退火
,
显微组织
,
耐蚀性
刘建平
,
杨小敏
,
王雪芳
,
赵永刚
材料导报
以聚二甲基硅氧(PDMS)弹性体为印模,十八烷基三氯硅烷(OTS)为"墨水",采用微接触印刷法分别在平整的玻璃基片表面和弯曲的玻璃棒表面进行印刷操作,将印刷后的基片浸入到PbS化学浴液中沉积得到微图案化的PbS薄膜.交叉印刷和光学显微观察结果表明,所沉积的PbS微图案边界清晰规整,并且PbS会选择性沉积在基片表面没有被OTS覆盖的区域.
关键词:
微接触印刷
,
微图案
,
化学沉积
