предговор
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Парт 1 of the ISO/IEC Directive describes the procedures used to develop this document and for further maintenance. Нарочито, обратите пажњу на различите стандарде одобрења који су потребни за различите типове ИСО докумената. This document has been drafted in accordance with the editorial rules in Part 2 ИСО/ИЕЦ директиве (види исо.орг/дирецтивес).

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This document has been prepared by Technical Committee ISO/TC 35, Боје и лакови, 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.

Any feedback or questions on this document should be referred to the user’s national standards body. A complete list of these institutions can be found at iso.org/members.html.

ИСО 22553-7-2020, Боје и лакови – electrodeposition coatings – Парт 7: Wet film resistance

увести
Wet film resistivity provides information about the deposition behavior of electrodeposited coatings, то је, information about film thickness and film thickness variation, homogeneous plating capacity, and possibly deposition properties under specific conditions.

1 Обим примене
This document specifies a method for determining the resistivity of wet films of electrodeposited coatings (e-coat) for the automotive industry and other general industrial applications (на пример. cooling units, consumer products, radiators, aerospace, agriculture).

2 Normative reference files
When the following documents are referenced in the context, part or all of them constitute the requirements of this document. За датиране референце, citation-only versions apply. За цитате без датума, the most recent version of the referenced document (including any amendments) примењује.

ИСО 1514, Боје и лакови — Standard plates for testing

ИСО 4618, Боје и лакови – Terms and definitions

ИСО 22553-1, Боје и лакови – electrodeposited coatings – Парт 1: Vocabulary

ИСО 23321, Paints and varnishes solvents – softening water for industrial applications – Specification and test methods

3 Terms and Definitions
For the purposes of this document, the terms and definitions given in ISO 4618, ИСО 22553-1 and below apply.

3.1 Resistance R

The ratio of the potential difference along a conductor to the current through it

Ентри Ноте 1: Resistance is given by Ohm’s law as shown in formula (1) :

u is the potential difference;

I is current.
The unit of resistance is ohm (Ох), given by the following formula:

Resistance depends on the material, size (length and cross section) and temperature of the conductor.

[Извор: ИСО 15091:2019, 3.1]

3.2 Resistivity ρ

Cross-sectional area The resistance per unit length of a material

Item Note 1: Resistivity is given by formula (2) :

A is the cross-sectional area of the conductor;

I is the length of the conductor.
Resistivity is measured in ohms · meters (Ω·m).

[Извор: ИСО 15091:2019, 3.2]

3.3 Wet film resistance Rw

Measure the total resistance (3.1) of electrodeposited coatings, including substrates, pretreatments, and other coatings

Белешка 1: When measuring resistance, technical measurement conditions also have an effect, на пример. membrane, measuring electrode.

Белешка 2 The unit of wet film resistance is ohm (Ох).

3.4 Dynamic wet film resistance

The measured total resistance (3.1) of the electrodeposited coatings (including substrates, pretreatments, and other coatings) is a function of deposition time

Белешка 1 The unit of wet film resistance (3.3) is ohm (Ох).

3.5 Electrostatic wet film resistance

Measure the total resistance (3.1) of the electrodeposited coatings, including substrates, pretreatments and other coatings read out at the end of deposition time

Белешка 1 The unit of wet film resistance (3.3) is ohm (Ох).

3.6 Wet film resistivity ρw

The wet film resistance (3.3) is multiplied by the electrode area relative to the distance between the electrodes

Белешка 1: Wet film resistivity is given by formula (3) :

Rw is wet film resistance;

A is the area of the electrode;

l is the length of the conductor.
The unit of wet film resistivity is ohm ·m (Ω·m).

3.7 Electrical conductivity γ

Reciprocal of resistivity (3.2)

Белешка 1: The conductivity is given by formula (4) :

The unit of conductivity is Siemens · m-1 (S · m-1).

[Извор: ИСО 15091:2019, 3.4]

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