CAJ | 학술논문

通过集气、动电位极化曲线、恒流放电、扫描电镜和X射线能谱等方法研究了纯铝在含有锡酸钠的4mol·L-4氢氧化钾的甲醇-水(甲醇和水的体积比为4:1,下同)混合溶液中的腐蚀和阳极溶解行为.实验结果表明,锡酸钠的添加通过具有较高析氢过电位的金属锡在电极表面的沉积,极大地抑制了铝在4 mol·L-1氢氧化钾的甲醇-水溶液中的腐蚀;而由于在锡沉积层中裂纹的出现,导致较大浓度锡酸钠的缓蚀作用有所降低.恒流放电结果表明,铝在含有锡酸钠的4 mol·L-1氢氧化钾的甲醇-水溶液中的恒流放电性能明显改进,而且铝阳极的放电性能随着锡酸钠含量的增大而逐渐提高.在20 mA·cm-2的放电电流密度下,铝阳极在含有10.0 mmol·L-1锡酸钠的电解液中显示了电位相对较低且较平坦的放电平台.
통과집기、동전위겁화곡선、항류방전、소묘전경화X사선능보등방법연구료순려재함유석산납적4mol·L-4경양화갑적갑순-수(갑순화수적체적비위4:1,하동)혼합용액중적부식화양겁용해행위.실험결과표명,석산납적첨가통과구유교고석경과전위적금속석재전겁표면적침적,겁대지억제료려재4 mol·L-1경양화갑적갑순-수용액중적부식;이유우재석침적층중렬문적출현,도치교대농도석산납적완식작용유소강저.항류방전결과표명,려재함유석산납적4 mol·L-1경양화갑적갑순-수용액중적항류방전성능명현개진,이차려양겁적방전성능수착석산납함량적증대이축점제고.재20 mA·cm-2적방전전류밀도하,려양겁재함유10.0 mmol·L-1석산납적전해액중현시료전위상대교저차교평탄적방전평태.
The corrosion and anodic dissolution behaviors of pure aluminum in Na2SnO3-containing 4 mol·L-1 KOH methanol-water mixed solutions with a methanol/water volume ratio of 4:1 were investigated. This was carried out by means of hydrogen collection, polarization curve, galvanostatic discharge, scanning electron microscopy (SEM), and energy dispersive analysis of X-ray (EDAX). The experimental results indicated that the addition of stannate inhibited the corrosion of aluminum in the 4 mol·L-1 KOH methanol-water solutions by the deposition of tin with a higher hydrogen evolution overpotential on the electrode surface. In the electrolytes with higher stannate contents the inhibiting effect decreased because of the occurrence of some cracks on the tin deposition film. The results of galvanostatic discharge showed that the discharge of aluminum in the Na2SnO3-containing 4 mol·L-1 KOH methanol-water solutions were obviously improved. In addition, the improvement effect enhanced with the increase of stannate content. It was noted that the aluminum anode showed a very flat discharge plateau at relatively low potentials in the electrolyte with 10.0 mmol·L-1 Na2SnO3 at 20 mA·cm-2 discharge current density.