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terminology of electrophoretic coatings and application



amine value

    and the number of milligrams of basic amine 1g needed perchloric acid and potassium hydroxide equivalents. (amine based epoxy resin curing agent is widely used, which represents the value of common functional amine)




glass transition temperature

    transition from high polymer elastic temperature glassy amorphous polymer means (polymorphs including an amorphous polymer portion) by a glassy state or a high elastic latter toward the former to the transition temperature, the amorphous the lowest temperature of the polymer macromolecules segment of free movement is usually represented by tg.





film forming material

   base coating composition, an adhesive having a function of other components of the coating formed in the coating film. the nature of its coatings and coating play a decisive role.


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    under low pressure pump, the flow of liquid removed from the hydrated salt to dissolve a process, the key is a thin, semi-permeable polymer film, the barrier film is selectively dissolved macromolecules or colloidal particles, while allowing water, salts, solvents, and other small molecules from passing through the ultrafiltration is continuous running at low pressure, the feed solution that is divided into two fluid spacer fluid and through the process fluid.




electrophoretic coating

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    general paint, like a film-forming substances, pigments, solvents and additives of four parts, which can dissociate in water-soluble film forming polymer is charged, and the role of the electric field, swimming in the opposite electrode ( be coated) deposited on its surface, it is a water-based paint. it is divided into anodic electrophoretic coating and cathodic electrodeposition coating.


    also known as electrodeposition coating, applied electric field is the use of the suspension in the electrophoretic liquid resin and pigment particles such as directional migration and deposited on the substrate surface of one of the electrodes of the coating method. it is impregnated with a conductive filled with water to be coated in a diluted, low solids electrophoretic coating as the working fluid in the anode (or cathode), in the electrophoresis tank corresponding to the recording of another cathode (or anode ), between both through direct current, homogeneous precipitation on the surface to be coated, a coating method of water-insoluble coating film. electrophoretic painting belongs immersion coating, production methods are continuous and intermittent two.

electrophoresis tank

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    electrophoretic dip tank coating job (or main groove)


also known as specific conductance, indicating a distance between poles 1cm (area 1cm2 female - between the anode) electrical conductance (& micro; s / cm), the greater the value, the stronger conductivity. in the electrophoretic coating process, the working fluid, uf liquid, and extent of the polar night with pure water conductivity difficulty expressed by conductivity.


    the current through the electrolyte solution or the molten electrolyte (also known as the electrolyte), causing oxidation-reduction reaction at the cathode and anode. electrophoresis electrophoretic coating electrolytic coating process into anionic or cationic colloidal particles, water electrolysis into hydrogen ions and hydroxide ions and emit hydrogen at the cathode, oxygen is released at the anode, the anode to be dissolved.


    colloidal particles in the conductive medium point charge affected by the electric field of the opposite electrode surging phenomenon. the use of charged particles in an electric field to move at different speeds and to achieve separation technology as electrophoresis.


    paint particles in precipitation phenomenon electrode called electrodeposition. when cathodic electrodeposition coating positively charged particles in the cathode cohesion, negatively charged particles in the anode plate aggregation, when the cation (resin and pigment) to react with the hydroxyl ions produced when he becomes insoluble coating film, electrically electrophoretic coating deposition process is the most important role.


just to be deposited on the film surface is coated with a semi-permeable membrane, under the continuing role of the electric field, the water contained within the film from the film dialyzed out toward the bath, the coating dehydration, a phenomenon become electro-osmosis. electroosmosis applicator into the hydrophilic coating hydrophobic, so that the coating film densification dehydration.




    electrophoretic coating or working fluid below 120 ℃ drying left part of the non-volatile solid electrophoretic coating or excessive fluid. however, electrophoretic coating belongs to thermosetting coating, electrophoresis coating at 120 ℃ only lost moisture and volatile organic solvents, not yet solidified, still wiping dissolved with the corresponding organic solvent at an elevated temperature to a predetermined curing temperature for a certain time to cure , so there will be weightlessness.

pigment to binder ratio

    electrophoretic coating, dry bath in a pigment to binder (resin) content ratio.

gel fraction

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electrophoresis coating after curing, in a mixed solvent in a predetermined period of time, the weight of the electrophoretic dip paint solvent before electrophoresis coating weight ratio to become electrophoretic paint gel fraction. gel fraction is a test method for measuring the degree of cure electrophoresis coating.




loss on heating 

    below 120 ℃ dry cathodic electrodeposition coating obtained after drying further warmed to a predetermined drying temperature after reaching full cure in the process of thermal decomposition of the low molecular weight compounds (ie, smoke phenomenon), so that the coating film weightlessness, a phenomenon known as heat reduction. heating loss is one of the merits of the cathodic electrodeposition coating measure.




coulomb efficiency

in the case of electrophoretic coating, the coating growth coulombic efficiency represents the degree of difficulty of the target, there are two representations: power consumption 1c deposited film quality to mg / c says it is also known electrical efficiency; solid or deposit 1g the number of coulombs of electricity required for the film to c / g expressed. the higher coulomb efficiency coating, the less need to deposit a certain amount of power consumed by the film quality. coulomb efficiency is one of the important electrophoretic coating workability.


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    is a chemical and electrochemical reaction to form a phosphate chemical conversion coating process, the phosphate conversion film called phosphating film formed. the main purpose of phosphating is: to provide protection to the base metal, to a certain extent, prevent metal corrosion; used in paint before bottoming, improve adhesion and corrosion resistance of the film layer.


    in the electrophoretic coating process is often as a result of fluid circulation, poor filtration, flow rate low, causing the working liquid pigment or particle sedimentation, resulting in horizontal and vertical bathing quality coating to be coated is not the same, horizontal plane of the film easy produce rough, loss of light phenomenon, coupled with the water level is easy to produce the film and then dissolved, thus affecting the smoothness of the film. swimming with painted & ldquo; l & rdquo; horizontal and vertical electrophoresis coating method quality assessment form template to be coated, and the results become & ldquo; effect, also known as horizontal deposition effect; l & rdquo.




neutralizer meq

    the amount of material, such as a water-soluble coating showing desired neutralizing agent, and the magnitude of material that is part of the consumption of neutralizing agent to mol / g (dry resin) represented. 100g solids coating may also be required to represent the neutralizer meq.

breakdown voltage

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usually the initial electrophoresis current is large, with deposition of the film, the film resistance increases, the current value abruptly falls and the voltage is above a certain electrophoresis, the current value is excessively large, sharp produce h2, thereby undermining deposited film, the coating film occurred significantly a. this phenomenon is usually called the breakdown voltage of the minimum voltage.




thermosetting resin/ coating

it refers to the production of the thermosetting resin after the resin is heated chemical changes gradually hardened molding, and then heating it should not soften, or an insoluble resin. coating a thermosetting resin as a film material composed of a thermosetting coating, electrophoretic coating belongs thermosetting coatings to be cured at a higher predetermined temperature, the drying process can also include solvent (moisture) volatile, hot melt coating, high temperature heat curing three stages.




acid value

    1 gram electrophoretic coating resins required naoh or koh in an amount (mg), commonly known as an acid value.

construction voltage 

    in order to be coated on the film coating voltage (dc).

ripening period 

electrophoresis bath is a former paint formulation plus water working fluid, stir and generally can not immediately paint samples, aging need some time to apply under the specified temperature conditions, this is known as bath curing cycle. electrodeposition bath aging is the main purpose of the bath low boiling solvent evaporates, and the resin is completely dissolved or dispersed in water.




anode electrodeposition coating

    carboxyl group-containing polymer, after ammonia or amines and carboxylic acid salts formed after, the use of such carboxylic acid salt as a binder, together with the appropriate pigments, fillers and additives, solvents prepared by grinding and dispersion paint, diluted with water as a solvent to form an aqueous solution of an anionic, the neutralizing agent is an inorganic base or an organic amine. workpiece to be coated anode, electrophoretic coating way for construction to obtain a dense film, the kind of paint called the anode electrophoretic coating.

cathodic electrodeposition coating

    containing hydroxy, amino, ether, amide and other polymers, through organic amine salts formed during and after, and the use of such themes as the amine salt resin resin, together with the appropriate pigments, fillers and additives, coating solvent and made by grinding the dispersion, diluted with water as a solvent to form an aqueous solution of a cationic, the neutralizing agent is an organic acid, to the workpiece to be coated as a cathode, electrophoretic coating manner of construction, so as to obtain a dense coating film, the kind of paint called cathodic electrodeposition coating.

throwing power

    ability electrophoretic coating process, to depart from the electrode (cathode or anode) is coated with lacquer coated surface is called throwing power. it represents the electrophoretic coating film on the film thickness distribution uniformity, it is also called the throwing. influence the level of throwing power of the electrodeposition paint corrosion resistance is one of the important characteristics of electrophoretic coating.

pigment volume concentration

    finger paint coloring pigments and the volume of all non-volatile formulations (including emulsion solids, coloring pigments and extenders) of the total volume ratio, referred to as pvc. (pvc = volume of pigments and fillers / (volume of pigments and fillers solid base volume) * 100%)





    in the case of electrophoretic coating, wet paint can be fluid and ultrafiltrate coated on again dissolved, that is, the electrophoretic coating wet film resistance capability of being dissolved again become insoluble again (or re-solubility).

impurity ion concentration

    mainly refers to be coated or linked to a pre-processing step into the main grooves of na, zn, fe and other miscellaneous ions by corrosion paint circulation piping and other reasons into iron ions, the original paint contains a very small amount of impurity ions. when the impurity ion content threshold above, the film prone to loss of light, the film performance degradation and so on.

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