通过室内埋片实验研究了X70钢在内蒙古西部地区苏里格大气田土壤中的腐蚀行为.在不同含水量的土壤中进行埋片,然后测定试样的自腐蚀电位和腐蚀速率随时间的变化关系,最后进行了试样的形貌观察和腐蚀产物的EDS和XRD的分析.实验结果表明,...通过室内埋片实验研究了X70钢在内蒙古西部地区苏里格大气田土壤中的腐蚀行为.在不同含水量的土壤中进行埋片,然后测定试样的自腐蚀电位和腐蚀速率随时间的变化关系,最后进行了试样的形貌观察和腐蚀产物的EDS和XRD的分析.实验结果表明,随着时间的延长,其腐蚀速率是不断变化的.在不同含水量的土壤中钢试样经过相同时间的腐蚀后,在水的质量分数为10%土壤中的腐蚀最严重,5%次之,20%腐蚀最轻微.经过30 d的腐蚀后,试样的腐蚀产物主要为铁的氧化物(Fe2O3,Fe3O4).对试样的自腐蚀电位Ecorr监测结果表明,30 d内不同含水量土壤中钢的自腐蚀电位变化规律是不同的,其中水的质量分数为20%的土壤中的Ecorr最低,5%的土壤中的Ecorr最高.Corrosion of X70steel in the soil of Sulige Gas展开更多
Background In order to bind or fix bioactive materials directly to the surface of a Ti implant, the prior binding process of functional groups （FGs, -COOH and -OH） to the implant surface is necessary. Conventional b...Background In order to bind or fix bioactive materials directly to the surface of a Ti implant, the prior binding process of functional groups （FGs, -COOH and -OH） to the implant surface is necessary. Conventional binding processes are so high-cost and complex, so it is essential to find a simple and effective procedure for Ti-FG binding.Methods Various electrolyte compositions and electrochemical processing were adopted in this study to develop a relatively simple and effective Ti-FG binding process. The ability of Ti-FG binding and calcium （Ca）/phosphorous （P）absorption and corrosion resistance were evaluated according to various titanium surface treatment in electrolyte involving -COOH and -OH ion by using X ray photoelectron spectroscopy （XPS）, field emission scanning electron microscope （FE-SEM） and potentiodynamic scan method respectively.Results In cases of -COOH, the anodic oxidation process （AN） showed an effective binding ability between -COOH and Ti surface. On the other hand, in cases of -OH, there were no significant differences in the result between the conditions used. In regard to the absorption of Ca and P on Ti surface, there was a minimal amount of Ca absorbed but no P was absorbed. The anodic oxidation series showed homogenous corrosion, whereas the electrolyte immersion （EL）series showed unstable corrosion. Although EL-OH showed a novel corrosion potential, the EL-COOH series showed good corrosion resistance over the anodic potential range.Conclusions The ability of binding between FG and the Ti surface and Ca/P absorption were strongly associated with the surface potential （ξ, potential）, which was dependent on the pH of the electrolyte. Accordingly, in order to achieve the effective absorption of various FGs on the Ti surface, it is needed to develop the combination process in addition to the electric affinity, relation with the ξ, potential.展开更多
文摘通过室内埋片实验研究了X70钢在内蒙古西部地区苏里格大气田土壤中的腐蚀行为.在不同含水量的土壤中进行埋片,然后测定试样的自腐蚀电位和腐蚀速率随时间的变化关系,最后进行了试样的形貌观察和腐蚀产物的EDS和XRD的分析.实验结果表明,随着时间的延长,其腐蚀速率是不断变化的.在不同含水量的土壤中钢试样经过相同时间的腐蚀后,在水的质量分数为10%土壤中的腐蚀最严重,5%次之,20%腐蚀最轻微.经过30 d的腐蚀后,试样的腐蚀产物主要为铁的氧化物(Fe2O3,Fe3O4).对试样的自腐蚀电位Ecorr监测结果表明,30 d内不同含水量土壤中钢的自腐蚀电位变化规律是不同的,其中水的质量分数为20%的土壤中的Ecorr最低,5%的土壤中的Ecorr最高.Corrosion of X70steel in the soil of Sulige Gas
文摘Background In order to bind or fix bioactive materials directly to the surface of a Ti implant, the prior binding process of functional groups （FGs, -COOH and -OH） to the implant surface is necessary. Conventional binding processes are so high-cost and complex, so it is essential to find a simple and effective procedure for Ti-FG binding.Methods Various electrolyte compositions and electrochemical processing were adopted in this study to develop a relatively simple and effective Ti-FG binding process. The ability of Ti-FG binding and calcium （Ca）/phosphorous （P）absorption and corrosion resistance were evaluated according to various titanium surface treatment in electrolyte involving -COOH and -OH ion by using X ray photoelectron spectroscopy （XPS）, field emission scanning electron microscope （FE-SEM） and potentiodynamic scan method respectively.Results In cases of -COOH, the anodic oxidation process （AN） showed an effective binding ability between -COOH and Ti surface. On the other hand, in cases of -OH, there were no significant differences in the result between the conditions used. In regard to the absorption of Ca and P on Ti surface, there was a minimal amount of Ca absorbed but no P was absorbed. The anodic oxidation series showed homogenous corrosion, whereas the electrolyte immersion （EL）series showed unstable corrosion. Although EL-OH showed a novel corrosion potential, the EL-COOH series showed good corrosion resistance over the anodic potential range.Conclusions The ability of binding between FG and the Ti surface and Ca/P absorption were strongly associated with the surface potential （ξ, potential）, which was dependent on the pH of the electrolyte. Accordingly, in order to achieve the effective absorption of various FGs on the Ti surface, it is needed to develop the combination process in addition to the electric affinity, relation with the ξ, potential.
