前言
国际标准化组织 (国际标准化组织) 是国家标准机构的全球联合会 (ISO成员机构). 国际标准的制定通常通过ISO技术委员会进行. 每个对已成立技术委员会的主题感兴趣的成员团体都有权在委员会中派代表参加. 国际的, 与 ISO 联络的政府和非政府组织也参与了这项工作. ISO 与国际电工委员会密切合作 (国际电工委员会) 关于电气标准化的所有问题.

部分 1 ISO/IEC 指令的描述了用于制定本文件和进一步维护的程序. 尤其, 注意不同类型的 ISO 文件所需的不同批准标准. 本文件是根据第 2 部分的编辑规则起草的。 2 ISO/IEC 指令的 (请参阅 iso.org/directives).

请注意，本文档的某些内容可能是专利权的主题. ISO 不负责识别任何或所有此类专利. 在文档开发过程中确定的任何专利权的详细信息将包含在收到的 ISO 专利声明的介绍和/或列表中 (参见 iso.org/patents).

Any trade names used in this document are information provided for the convenience of the user and do not constitute an endorsement.

自愿性相关标准说明, ISO specific terms related to conformity assessment and the expression of meaning, and the ISO in the technical barriers to trade (技术性贸易壁垒) 坚持世界贸易组织原则 (世贸组织) 信息, please refer to the iso.org/iso/foreword.html.

This document has been prepared by Technical Committee ISO/TC 35, 油漆和清漆, 小组委员会SC 9, 油漆和清漆的常用测试方法.

ISO 中所有部件的列表 22553 系列可以在 ISO 网站上找到.

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.

国际标准化组织 22553-7-2020, 油漆和清漆 – 电泳涂料 – 部分 7: 湿膜电阻

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

1 适用范围
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 (例如. cooling units, consumer products, radiators, 航天, 农业).

2 规范性参考文件
当上下文中引用以下文档时, 部分或全部构成本文件的要求. 对于注明日期的参考文献, 仅引用版本适用. 对于未注明日期的引文, the most recent version of the referenced document (包括任何修订) 适用.

国际标准化组织 1514, 油漆和清漆 — Standard plates for testing

国际标准化组织 4618, 油漆和清漆 – 术语和定义

国际标准化组织 22553-1, 油漆和清漆 – 电沉积涂料 – 部分 1: 词汇

国际标准化组织 23321, Paints and varnishes solvents – softening water for industrial applications – 规格及测试方法

3 术语和定义
就本文件而言, ISO 中给出的术语和定义 4618, 国际标准化组织 22553-1 和以下适用.

3.1 Resistance R

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

参赛须知 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 (哦), given by the following formula:

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

[来源: 国际标准化组织 15091:2019, 3.1]

3.2 Resistivity ρ

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

项目备注 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).

[来源: 国际标准化组织 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

笔记 1: When measuring resistance, technical measurement conditions also have an effect, 例如. membrane, measuring electrode.

笔记 2 The unit of wet film resistance is ohm (哦).

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

笔记 1 The unit of wet film resistance (3.3) is ohm (哦).

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

笔记 1 The unit of wet film resistance (3.3) is ohm (哦).

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

笔记 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)

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

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

[来源: 国际标准化组织 15091:2019, 3.4]

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