1. --chemical corrosion chemical corrosion
Metal corrosion (oxidation) process under non-electrochemical action. Usually refers to a non-corrosion electrolyte solution and drying gas, pure chemical action caused.
2. The electric double layer --electric double layer
Present on the interface between the electrode and the electrolyte solution equal layer of charges of opposite sign.
3. The bipolar electrode --bipolar electrode
An external power supply and connected between the anode and the cathode immersed in the electrolyte conductors. The portion closer to the anode conductor acts as the cathode, and the portion near the cathode serves as an anode.
4. dispersing ability --throwing power throwing power
Under certain conditions, the solution must be the upper electrode (usually a cathode) more uniform distribution of coating than the result obtained by the initial current distribution ability.
This term can also be used for the anodic process, which is defined similarly to the above persons.
5. decomposition voltage --decomposition voltage
Similar to those defined above.
Enables the electrochemical reaction to significantly speed the ongoing minimum voltage (ohmic voltage drop of the solution is not included).
6. insoluble anodes (inert anode) - inert anode / insoluble anode
When current is passed through the anode anodic dissolution reaction does not occur.
7. Electrochemical --electrochemistry
Research on electron conductor and ion conductor of the contact interface and the nature of the change science.
8. The electrochemical polarization (activation polarization) - activation polarization
Because of the difficulties encountered during the electrochemical reaction caused by polarization.
9. The electrochemical corrosion --electrochemical corrosion
Peel substance dissolved in the solution tuck or metal surface liquid film, and subject to the laws of the electrochemical reaction of metal corrosion (oxidation) process
10. The electrochemical equivalent --electrochemical equivalent
On the electrode (for example 1 A, 1 or 1 Coulomb Faraday), the electrode reaction of the product formed by the theoretical weight per unit of electricity. Usually in g / Coulomb or g / Ah representation.
11 conductivity (specific conductance) - conductivity
Conductance conductor cross-sectional area of the unit and the unit length, usually expressed in S / m.
12 Electrophoresis --electrophoresis cataphoresis
Transfer relatively liquid colloidal particles under external electric field in the liquid medium charged.
13 EMF --electromotive force
When the primary battery open circuit potential difference between the poles.
14 passivation potential --passivation potential
Metal anode electrode polarization, the metal anode dissolution rate of a sudden drop in potential. Typically corrosion current before reaching the passivation potential through a maximum.
15 --corrosion potential corrosion potential
Stable electrode potential metal material in a particular corrosive environment created spontaneously.
16 current density --current density
Current intensity per unit area of the electrode through, usually expressed in A / dm2.
17 current efficiency --current efficiency
Unit of electricity through the electrode, the actual quality of the electrode reaction product of the electrochemical equivalent, usually expressed as a%.
18 corrosion rate, corrosion current --corrosion rate (vcor), corrosion current (Icor)
The corrosion rate is the amount of material per unit of time on a particular surface material change. Or by Faraday's law, the corrosion rate under current corrosion potential.
Corrosion current: Icor = nFvcor;
Where: the number of electrons n- electrode reaction;
F- Faraday constant;
vcor- corrosion rate.
19 electrode --electrode
Placed in a conductive medium (e.g. electrolyte, molten, solid, or gas) in the conductor. It is a current flowing into or out through the conductive medium.
--electrode Potential electric potential electrode 20
Under standard conditions, an electrode and the standard hydrogen electrode (a negative electrode) composed of primary cells, the measured force called hydrogen standard electrode potential of the electrode, or simply electrode potential. Hydrogen standard electrode potential of various electrodes can be shown between the electrodes and the solution interface relative size of the potential difference.
21 electrolyte --electrolyte
Itself has ion conductivity or under certain conditions (e.g., high temperature melting or dissolved in a solvent to form a solution) can exhibit ion conductive substance.
22 electrolyte --electrolytic solution
A solution having ionic conductivity.
23 --degree of ionization degree of ionization
The electrolyte solution in the presence of free ions of the ratio to the total number of moles. It is typically expressed in%.
24 depolarization --depolarization
Join some depolarizer leaving reduce electrode polarization phenomena in the electrolyte solution or the electrode.
25 equilibrium electrode potential --equilibrium electrode potential
Electrode potential of the electrode reaction in thermodynamic equilibrium.
26 positive --positive electrode
Two electrodes in a galvanic cell potential than the positive electrode.
27 negative --negative electrode
More negative electrode potentials in the two electrodes of a galvanic cell.
28 cathode --cathode
Electrode reduction reaction, that the reactants thereon to obtain electronic electrodes.
29 cathodic polarization --cathodic polarization
When a current is passed, the cathode electrode potential in the negative direction of the phenomenon of migration.
30 cathodic coating --cathodic coating
Than the electric potential of the base metal electrode corrections metal coating.
31 anode --anode
Electrode oxidation reaction, i.e. can accept electrons given electrode reactant.
32 anode slime --anode slime
In the current action, the anodic dissolution process produces insoluble residue.
33 anodic polarization --anodic polarization
When a current is passed, the potential of the anode electrode to the positive direction of the phenomenon of migration.
34 anodic coating --anodic coating
Electrode potentials more negative base metal metal coating.
35 transport number --transport number
When the current through the electrolyte solution, a solution of an ion in the total current carried by the current ratio of the ion transport number is called.
36 overpotential --overpotential
There thermodynamic equilibrium electrode potential and the current through the electrode potential difference between the electrodes.
--diffusion Layer diffusion layer 37
When the current through the electrode surface in the vicinity there is a thin layer of solution concentration gradient.
38 stray current --stray current
Through the loop (for example, the plating tank or tank heater, etc.) other than the current line of the current flowing in.
39 conductive salt --conducting salt
Added to the electrolyte solution can be improved conductivity salts.
40 volume current density --volume current density
Unit volume of the electrolyte solution through the current intensity. Typically A / L expressed.
41 deposition rate --deposition rate
Unit time-plated surface deposited metal thickness. Usually μm / h Fig.
42 initial current distribution --primary current distribution
When the electrode polarization does not exist, the current distribution on the electrode surface.
43 --local corrosion localized corrosion
Corrosion damage mainly in the local area of the surface, while the other part is almost a phenomenon that is not subject to corrosion.
44 polarization --polarization
Current through the electrode, the electrode potential from its equilibrium value phenomenon.
45 polarization --polarizability
Electrode potential with the rate of change of the current density, which is equivalent to changing the electrode potential of the unit current density caused by the change.
46 polarization curves --polarization curve
The relationship between the electrode potential and the current density of the electrode is described by the curve.
47 pole spacing --Interelectrode distance
Distance (positive and negative electrode or cathode and anode) between the two primary cell or cell electrodes.
48 emulsifying --emulsification
Tiny droplets of one liquid in another liquid dispersion phenomenon immiscible in uniform.
49 --stress corrosion stress corrosion
Cracking metal material under stress and corrosive environment interaction occurred.
50 gassing --gassing
There during the electrolysis visible outgassing phenomenon.
51 activation --activation
By adjusting the effective concentration to achieve the desired behavior to eliminate the passive state of the electrode surface.
52 activity --activity
In the standard state thermodynamic concentration in the solution components, namely real effective concentration calibration solution and the nature of the deviation from the ideal solution for use.
53 standard electrode potential --standard electrode potential
Under standard conditions, the electrode reaction activity of all reactants and products (or fugacity) are equal to the balance of the electrode potential l.
54 concentration polarization --concentration polarization
There are current through the reactant or product concentrations change near the surface of the electrode polarization caused by the electrodes.
55 passivation --passivation
Some solution to a metal anode polarization after more than a certain value, the metal dissolution rate not only did not increase, but intense decreases, the metal surface by the "activation state" to "passive" process is called passivation. Anodic polarization caused by the passivation electrochemical passivation, passivation solution by the action of some cause passivating agents are called chemical passivation.
56 --spot corrosion pitting
Dot appearing on the surface of the metal corrosion.
57 coordination compound --complex compound
Coordination bond compound having a metal ion or atom with a certain number of negatively charged groups or electrically neutral polar molecules.
58 double salt --double salt
A certain percentage of the two salts crystallize together from the compound. Coordination compound crystal form of which is essentially based.
59 --hydrogen embrittlement hydrogen embrittlement
Metal or alloy to absorb hydrogen brittleness under stress and have caused.
60 hydrogen permeation --seepage hydrogen
Metal works in the etching, degreasing or plating process often adsorption phenomenon of hydrogen atoms.
61 --interracial tension interfacial tension
The interface between the two phases present in the interfacial force of contraction called interfacial tension. If one is a gas phase is called surface tension.
62 critical current density --critical current density
The desired electrode reaction in the plating potential range, the reaction can be carried out to maintain the highest or lowest current density. Above the highest current density, potential moves beyond the desired range, will have new side effects occur. Below the threshold current density, the electrode reaction rate and reach the requirements of the production on.
63 semi --half-cell battery
And a single electrode system constituted by an electrolytic solution.
64 --galvanic cell primary battery
Can chemical energy directly into electrical energy. A primary battery can be viewed as being composed of two half-battery.
65 salt bridge --salt bridge
Connecting the two half-cell potential for reducing junction device, typically containing a higher concentration of the electrolyte solution (for example, saturated KCL solution) glass tube.
66 pH value --pH value
Hydrogen ion activity αH + (or approximated by concentration) negative common logarithm, ie a pH = logaH +.
67 base material --basis material (substrate)
Which can be formed or deposited metal film material.
68 auxiliary anode --auxiliary anode
Additional anode in order to improve current distribution on the surface to be plated parts used.
69 auxiliary cathode --auxiliary cathode
Some parts of the additional current is too focused on certain parts of the cathode shape to avoid glitches and burning and other defects, such additional auxiliary cathode is a cathode.
70 contact potential --contact potential
When two different electrically conductive material in contact potential difference generated at the interface.
Between 71 --intercrystalline corrosion corrosion
Selective occur along the grain boundary corrosion.
72 --solubility product solubility product
Undissolved electrolyte at a temperature corresponding to the saturated solution concentration of product ions, wherein the power of each ion concentration in the electrolyte with its ionization coefficient of the same equation.
73 Solubility --solubility
At a certain temperature and pressure, a solvent that can dissolve in 100g maximum number of grams of solute.
74 microscopic coverage --microcovering power
Under certain conditions, the ability of metal ions in the pores or scratches in the electrodeposition of the plating solution.
75 cell voltage --tank voltage
Electrolysis unit cell between the two poles of the total potential difference.
76 stationary electrode potential --static electrode potential
When no external current through the metal electrode potential of the electrode in the electrolyte.
77 chelate --chelate compound
Central ion ligand complex with a number of compounds having a cyclic structure formation.
78 leveling effect --1eveling action
The coating bath surface smoother than the capacity of the substrate surface.
79 coverage --covering power
Under certain conditions electroplating, metal plating deposition ability to cover the entire surface of the plating.
80 major surface --signiflcant surface
Predetermined surface plating on the front and rear parts of the coating on the surface of the article and the appearance (or) performance is extremely important.
81 --striking current surge current
Instantaneous large current through the plating process equipment