The inner anode and its choice for copper plating on stainless steel was emphatically introduced.
The inner anode includes insoluble carbon and phosphorous-copper bar.
In the test, phosphorus-free copper bar replaced phosphorous copper bar as inner anode of acidic copper plating. The characteristics and control methods of anodic reaction were given.
Through simulating the influential factors of the duct device in two-sides electroplating utilizing physical model,the knowledge of device size and positioning of duct device was achieved: in order to obtain uniform plate,the radius of the inner anode should be greater than the half of that of the device to be plated and with its position close to the device,and the ion concentration in solution should be reduced.
Asymmetric anode substrate and temperature raised rapidly are the main factor of anode substrate warp and crack under molding pressure 25MPa-250MPa.
The oxidation peak current at 0.46v is in direct proportion to concentration of Hg 2+ during 8.0×10 -6 and 5.0×10 -8 mol/L. The mehtod is applied to determine Hg 2+ in waste water.
结果表明 ,在 8 0× 10 6～ 5 0× 10 8mol/L浓度范围内 ,阳极峰电流与二价汞离子的浓度成正比 ,与未经修饰的裸玻碳电极相比 ,电流响应的灵敏度得到了很大提高 ,并应用于污水中汞含量的测定。
The oxidation peak potential of NO at the modified electrode was lowered by 230mV compared with that at the bare electrode. The peak current was proportional to the concentration of NO in the range of 8.4×10 -8 ～1.4×10 -5 mol/L with correlation coefficient of 0 999 and detection limit of 2.8×10 -8 mol/L.
NO在修饰电极上的阳极峰电位比在裸电极上降低 2 30 m V,NO浓度在 8.4× 1 0 -8～ 1 .4× 1 0 -5mol/L范围内 ,阳极峰电流与 NO的浓度呈线性关系 ,相关系数 r=0 .999,检测限为 2 .8× 1 0 -8mol/L。
Normal temperature analogue experiment of anode bubble's behavior in aluminum electrolysis cells
In aluminum electrolysis production process, characteristic sound is followed when electrolyte and aluminum liquid circularly flow in aluminum reduction cell, contact surface undulates, anode gas discharges and anode effect occurs.
As an inner radiation anode, it has more outstanding advantages.
Mild steel inside the crevice was anode and that outside the crevice was cathode in 5%NaCl solution.
Selection of Cr plating anodes
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The paste is then inserted between the battery outside layer and the inner anode.
A simulated crevice corrosion cell was used to study the anolyte within crevice of Steel Cr18Ni9Ti in 3% NaCl sulotion.As the anodic current increased the pH value decreased rapidly and the alloying element Cr was the main factor for the lowering of pH value of anolyte within crevice.It was found that the Cr(Ⅲ)existed in the form of stable soluble hydroxy-chloro-complexes in the occluded solution within crevice.The insoluble hydroxide Cr(OH)_3 precipitate was not observed.It was deduced that the passive film...
is not the same as the material and production process to have different special properties, stainless steel imported cold rolled stainless steel, high purity, high hardness, better corrosion resistance than copper, he will generally not to contact the corrosive goods. what's the big problem.。17-4ph stainless steel has excellent corrosion resistance. corrosion tests and service experience have shown that in all aged conditions it is superior to standard hardenable stainless grades such as 420, 431 and 410. its corrosion resistance is comparable to grade 304 stainless.。间隙腐蚀 crevice corrosion。
采用摸拟缝隙的闭塞电池研究了0Cr18Ni9Ti 奥氏体不锈钢在3%氯化钠溶液中闭塞区内溶液的变化和 Cr(Ⅲ)存在的形态。当电流通过闭塞区时,随电量的增加,溶液的 pH 值迅速下降,Cl~-离子浓集。合金元素 Cr 是导致该体系中缝内阳极液低 pH 值的主要因素。用分光光度法和电化学分析法研究了阳极液,发现 Cr(Ⅲ)是以稳定而可溶的羟氯络合物形态存在于缝内闭塞液中,没有观察到 Cr(Ⅲ)因水解而形成的难溶 Cr(OH)_3沉淀物。根据上述实验结果推断:由于 Cl~-离子在缝内不锈钢表面的特性吸附,并进一步与膜中主要成份 Cr 形成可溶性的羟氯络合物而淡钝化膜遭到破坏,从而使腐蚀加剧。
The effect of thiocyanate ion on the electrochemical behavior of armc6 iron in deoxygenated acidic perchlorate and sodium sulphate solutions(total ionic strength 1N) has been investigated by means of galvanostatic polarization measurements under steady-state conditions. The results of investigations show that the electrochemical behavior of iron in perchlorate solutions in the absence and presence of SCN~- is identical with that obtained in the corresponding sodium sulphate solutions. In different SCN"-concentration...
The effect of thiocyanate ion on the electrochemical behavior of armc6 iron in deoxygenated acidic perchlorate and sodium sulphate solutions(total ionic strength 1N) has been investigated by means of galvanostatic polarization measurements under steady-state conditions。 The results of investigations show that the electrochemical behavior of iron in perchlorate solutions in the absence and presence of SCN~- is identical with that obtained in the corresponding sodium sulphate solutions。 In different SCN"-concentration ranges thiocyanate ion exerts quite different influence on the electrochemical behavior of iron。
At low SCN"-concentration range(C_(SCN~-≤0。05N) thiocyanate ion inhibits both iron anodic dissolution and hydrogen evolution reactions, in higher SCN~-- concentration solutions(C_(SCN~-≥0。lN) thiocyanate ion acts as an accelerator for iron anodic dissolution but impedes hydrogen evolution process on iron electrode。 Kinetic models which may elucidate the experimental results are proposed。
The corrosion of carbon materials in the presence of Pt catalyst was studied in pH 0.3～11.8 using mass spectrometric cyclic voltammetry (MSCV). The corrosion was found to be greatly accelarated by Pt for both active carbon and acetylene black as evidenced by a negative shift of the onset potential (φ_s) of CO_2 evolution which is more negative than the O_2/H_2O equilibrium potential. Both active carbon and acetylene black are corroded when they are used for either anodes or oxygen cathodes. In the case of active...
The corrosion of carbon materials in the presence of Pt catalyst was studied in pH 0.3～11.8 using mass spectrometric cyclic voltammetry (MSCV). The corrosion was found to be greatly accelarated by Pt for both active carbon and acetylene black as evidenced by a negative shift of the onset potential (φ_s) of CO_2 evolution which is more negative than the O_2/H_2O equilibrium potential. Both active carbon and acetylene black are corroded when they are used for either anodes or oxygen cathodes. In the case of active carbon Pt does not change the pH dependence of φ_s and the overpotential η_s of the onset of CO_2 evolution (they follow broken lines deflecting near pH = 7) while the situation is more complicated for acetylene black. The presence of Pt changes the φ_s-pH and η_s-pH from broken lines into straight lines. Moreover, there are two waves on the I_M-φ curves for CO_2 formation, probably indicating two types of oxides on the acetylene black surfaces.