introduction
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ISO 22553-1- Paints and varnishes electrodeposited coatings – Part 1: Vocabulary

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This document was prepared by Technical Committee ISO/TC 35, Paints and Varnishes, Subcommittee SC 9, Common Test Methods for paints and varnishes.

A list of all the parts in the ISO 22553 series can be found on the ISO website.

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introduce
In the electrodeposition coating process, the non-volatile substances in the water-dilutive electrodeposition coating are deposited on the workpiece by the electrophoretic process. During this process, the internal and external areas of the workpiece, including all cavities, are touched. Cathode deposition or anode deposition is distinguished according to whether the workpiece is used as cathode or anode. The cathodic electrodeposition coating process is commonly used (see Figure 1).

Figure 1 – Example of the deposition process during cathodic electrodeposition coating

ISO 22553-1- Paints and varnishes electrodeposited coatings – Part 1: Vocabulary

Key

Through the combination of adhesives, pigments and deposition processes, hardening creates a very corrosion-resistant coating on the workpiece, which contributes significantly to corrosion protection in both internal and external areas.

The electrical properties of the material are also important for the electrical energy consumption (bulk charge density) of the process.

Since the electrophoretic paint is jointly responsible for the overall appearance of the coating system, it is often emphasized that the coating works well and has no visible defects.

Therefore, for extensive corrosion protection and sealing of the workpiece, additional joint sealing materials, adhesives or foams are recommended.

Inside the electrophoresis tank, bacterial contamination may be present due to the material being dragged in and the physical conditions (heat, water-based media, carbon sources, etc.).

This document specifies the terms and definitions of electrodeposited coatings. The subsequent part of the ISO 22553 series specifies methods of characterization and testing of electrodeposited coatings. An overview of the test methods is given in Annex A.

ISO 22553-1- Paints and varnishes electrodeposited coatings – Part 1: Vocabulary

1 Scope of Application
This document defines the terms for electrodeposited coatings.

It is suitable for electrodeposition coatings in the automotive industry and other general industrial applications, such as chiller, consumer goods, radiators, aerospace, agriculture.

2 Normative reference documents
There are no normative references in this document.

3 Terms and definitions

3.1 Volume charge density ρ

Quotient of charge Q and volume V, as shown in the formula:

Paints and varnishes – electrodeposited coatings – Part 1: Glossary Diagram 2

Note 1: The volume charge density is expressed in coulombs per cubic meter (C/m 3).

Article Note 2:1 C/m 3 = 1 A⋅s/m 3.

3.2 Deposition voltage u

The voltage is adjusted on the corresponding device to deposit an electrodeposited coating material (3.9) by an anode or cathode method, having a film thickness specified for the coating material

Note 1: The deposition voltage is measured in volts (V).

3.3 Deposition time

The time required to obtain the desired film thickness

3.4 Anode electrodeposition coating process

Anodic electrophoresis process

A variant of an electrodeposited coating in which the coated components are connected as an anode and the reverse electrode is connected as a cathode

3.5 Pigment content, determined by ashing

Mass fraction of residue after ashing of the product under specified conditions

Note 1: It includes inorganic pigments, fillers, and other solid components of the product that do not evaporate under test conditions, but their state may change.

3.6 Baking Process

The final drying and chemical crosslinking process of the applied paint film is initiated by heating

ISO 22553-1- Paints and varnishes electrodeposited coatings – Part 1: Vocabulary

3.7 Baking loss

Volatiles released under standard baking conditions

Note 1: Baking loss includes reaction loss.

3.8 Entry Tags

Visible defects that occur during the immersion of the panel under voltage, usually in the form of streaks parallel to the bath surface on the object to be painted

Example:

Hash marks (see Figure 5), pinholes (see Figure 4), mappings (see Figure 3).

3.9 Electrodeposited coatings

Electronic coating

Waterborne coatings for electrophoretic coating

3.10 Deposition time

The time that voltage is applied between anode and cathode during the coating process

3.11 Flores

Flower-shaped craters, formed by a combination of single craters

Entry Note 1: See Figure 2 for an example.

Figure 2 – Flores’ example

ISO 22553-1- Paints and varnishes electrodeposited coatings – Part 1: Vocabulary

3.12 Edge protection

The ability to protect edges from corrosion

Article Note 1: Edges may be produced by drilling, punching, and cutting.

3.13 Edge corrosion

Corrosion due to inadequate edge protection (3.12)

Article Note 1: Edges may be produced by drilling, punching, and cutting.

3.14 Cathode electrodeposition coating process

Cathodic electrophoresis

A variant of an electrodeposited coating in which the coated parts are connected as a cathode and the reverse electrode is connected as an anode

ISO 22553-1- Paints and varnishes electrodeposited coatings – Part 1: Vocabulary

3.15 Bacteria count

Colony count

The number of colony forming units (CFU) to form a macroscopically countable colony

3.16 Mapping

Local differences in film thickness in electrodeposited films

Entry Note 1: See Figure 3 for an example.

Figure 3 – Mapping example

ISO 22553-1- Paints and varnishes electrodeposited coatings – Part 1: Vocabulary

3.17 Pinholes

The holes in the coating extend all the way to the substrate

Article Note 1: Pinholes are often mixed with craters.

Entry Note 2: See Figure 4 for an example.

Figure 4 – pinhole example

3.18 Hash tag

Hydrogen attached during the process causes characteristic depressions in the electrodeposited coating

Item Note 1: One characteristic of the pound sign is the direction of the horizontal line. In particular, hash marks appear when the specimen is heavily impregnated.

Entry Note 2: See Figure 5 for an example. A distinct hash mark can be detected on the right side that has been moistened with softening water. On the left side of the department, there are significantly fewer hash marks.

ISO 22553-1- Paints and varnishes electrodeposited coatings – Part 1: Vocabulary

3.19 Stability

Electrodeposited coatings are often exposed to the aging process, especially during extended downtime (holidays, downtime, etc.), such as:

– evaporation of water, solvents and neutralizers;

– Chemical changes in adhesives caused by air;

— bring in bacteria;

– Other reactions of the adhesive

3.20 Effort

The ability of the electrodeposited coating to penetrate the box section

3.21 Workpieces

Objects coated with material

ISO 22553-1- Paints and varnishes electrodeposited coatings – Part 1: Vocabulary

Example:

Pipes, radiators, vehicles, steel test plates, magnesium and aluminum alloys, pre-treated plastics.

3.22 Rupture voltage

Electrodeposition coatings deposit a potential that is no longer controllable, for example, a significant change in film thickness, gas formation, or heat generation

Note 1: The rupture voltage can only be determined experimentally by the voltage series.

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