In the chemical power supply, rarely used by a single material manufactured plate electrode (or called the whole electrode), and most of the powder porous electrode.
Corrosion of steel is strongly influenced by the environment, and corrosion under moist atmospheres and other humid gases is the most common corrosion phenomenon. In addition, since steel is the most commonly used metal in the manufacture of industrial equipment, the corrosive environment of industrial electrolytes and gases is even more hostile.
The experiment was divided into four parts: pretreatment of the specimens, electrodeposition of Zn-Ni alloy coating, corrosion of the specimens observed by metallurgical microscope, and Tafel curve test of the specimens in NaCl.
The precipitation of hydrogen is the most common reaction in the aqueous solution system, is the basic reaction of electrolysis of water, but also the secondary battery charging process, electroplating process is often accompanied by side reactions, therefore, is a common and important reaction in the electrochemical system.
Cyclic voltammetry has been widely used in electrochemical research due to its features of simple experiment, abundant information and theoretical analysis. For example, it can be used to quantitatively analyse the peak current, qualitatively analyse the peak potential difference, determine the reversibility of electrode processes, explore the electrochemical behaviour of unknown electrochemical systems, and apply it in various fields of applied electrochemistry.
The AC impedance method is also known as electrochemicalim pedance spectroscopy (EIS) when applied to electrochemical systems. The method involves controlling the current (or potential) through an electrode to vary sinusoidally with time under small amplitude conditions, and simultaneously measuring the pattern of variation of the electrode potential (or current) with time as its response, or directly measuring the AC impedance (or conductance) of the electrode.
Cyclic voltammetry refers to controlling the potential under study to scan from the initial potential to the reverse potential at a constant speed, changing the scanning direction, scanning back to the initial potential at the same speed, and continuing to reverse the potential, repeatedly scanning, and recording the current-potential The curves are called cyclic voltammetry lines.
To measure the chemical impedance at complex frequencies, a frequency response analyzer, known as the digital version of the lock-in amplifier, is used to make the frequency sweep easier to use.
Constant current charging and discharging method, also known as timing potential method. Its basic working principle is to charge and discharge the tested electrode under constant current conditions, record the change rule of its potential with time, and then study the electrode's charging and discharging performance and calculate its actual specific capacity.
