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电工钢带(片)涂层绝缘电阻和附着性测试方法
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GBT 2522-2017
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标准编号: GB/T 2522-2017 (GB/T2522-2017)
中文名称: 电工钢带(片)涂层绝缘电阻和附着性测试方法
英文名称: Methods of test for the determination of coating insulation resistance and coating adhesion of electrical strip and sheet
行业: 国家标准 (推荐)
中标分类: H21
国际标准分类: 77.040.99
字数估计: 7,751
发布日期: 2017-07-12
实施日期: 2018-04-01
旧标准 (被替代): GB/T 2522-2007
采用标准: IEC 60404-11-2012, NEQ
起草单位: 武汉钢铁股份有限公司、宝山钢铁股份有限公司、首钢总公司、冶金工业信息标准研究院
归口单位: 全国钢标准化技术委员会(SAC/TC 183)
提出机构: 中国钢铁工业协会
发布机构: 中华人民共和国国家质量监督检验检疫总局、中国国家标准化管理委员会
范围: 本标准规定了电工钢带(片)涂层绝缘电阻和附着性的测试方法。本标准适用于无取向和取向电工钢带(片)表面绝缘电阻和层间电阻的测试，以及无取向和取向电工钢带(片)绝缘涂层附着性的测试。
GB/T 2522-2017: 电工钢带(片)涂层绝缘电阻和附着性测试方法
GB/T 2522-2017 英文名称: Methods of test for the determination of coating insulation resistance and coating adhesion of electrical strip and sheet
1 范围
本标准规定了电工钢带(片)涂层绝缘电阻和附着性的测试方法。
本标准适用于无取向和取向电工钢带(片)表面绝缘电阻和层间电阻的测试,以及无取向和取向电
工钢带(片)绝缘涂层附着性的测试。
2 涂层绝缘电阻的测试
2.1 测量原理
采用只能进行单涂层测量的富兰克林法。
设备电路示意图如图1所示。在规定的电压和压强下,将10个固定面积的金属触头压在钢板的一
个涂层表面上。通过测量流过10个触头的电流来评定表面绝缘涂层的效能。
2.2 试样
2.2.1 每个试样应由一个样片或一段样带构成。试样的长度和宽度应分别大于2.3所述的触头部件的
长度和宽度。测试是破坏性的,试样只能使用一次。
2.2.2 为了得到具有代表性的结果,试样应从钢板的整个宽度上剪取。试样表面应清洁、平整、无斑痕和划痕。
2.3 测试装置
2.3.1 触头部件
待测试样被压在平板底座和触头部件之间,触头部件由10根垂直安装的金属杆组成,这些金属杆
可压缩弹簧在固定的单元内轴向移动。这10个触头通常排成两行,为方便使用也可排成一行。每根杆
的端部由一个用青铜或其他合适的材料(如不锈钢)做的触头极靴,并与框架绝缘。
2.3.2 电源
应使用最大负载电流为1.0A的直流稳压电源,确保两电极间电压稳定在500mV。
2.3.3 电流测试
以±2%或更小的测量不确定度的方法测试流过触头极靴的电流。这可以在稳压电源的输出端与
触头极靴之间靠近电源一侧接入一只电流表。
稳压电路和电流测试系统电路原理图如图2所示。
2.3.4 外加力的测定
应以±5%或更小的测量不确定度的合适的方法测试所有触头施加在待测试样上的合力。
2.4 设备确认
设备的确认宜采用以下三种形式:
a) 在额定试验压力下,把触头和钻头施加于洁净的铜板上,流过10个触头的总电流应是1.0×
(1±3%)A,如果实际情况与之不符,应检查触头的清洁度、钻头的锐度和接触电阻。
b) 在额定试验压力下,通过触头把复写纸压在白纸上,这时应出现均匀的压痕,而没有力集中的
痕迹。可用颜色密度变化显示施加压力的力度测量板来代替复写纸和白纸。
c) 依次把0.1Ω、1Ω、10Ω和100Ω的标准电阻连接到钻头与触头极靴之间,示值稳定,并达到
所要求的电流水平。
2.5 测试步骤
2.5.1 把试样放在试样台和10个触头之间,缓慢施加一定的力:对于645mm2的总面积施加1290×
(1±5%)N的力,对于1000mm2的总面积施加2000×(1±5%)N的力,相当于2N/mm2 压力。
2.5.2 以稳压电源对电极供电,并读取总电流(或由计算机读取)。
2.5.3 如果测试是评价单面的涂层绝缘质量,应使10个触头在钢板的10个具有代表性的不同区域或
者10个测试样上测取10个数据。
2.5.4 如果测试是综合评价双面涂层的绝缘质量,则应使用10个触头在钢板的每一面选取5个具有代
表性的不同区域或者在5个测试试样上进行测试,在测试试样的同一个区域不应进行两面的测试。
2.6 涂层绝缘电阻的计算
2.6.1 表面绝缘电阻系数
将10个并联触头10次测量的电流值代入式(1),计算得出表面绝缘电阻系数(单面涂层10次测量
值,或涂层上下表面每个面各5次测量值)。
2.6.2 层间电阻系数
层间电阻系数表示的RA 值代表了产品上下两个表面电阻值,理论上是表面绝缘电阻系数C 的
2倍。
2.7 重复性和再现性
即使设备及操作和维护等都处于良好状态时,用富兰克林法测试涂层绝缘电阻,其重复性和再现性
很大程度上受试样表面特性的影响。在实际测试中很难评估方法的重复性和再现性。
2.8 测试报告
测试报告至少包括以下信息,除非另有约定:
a) 本标准编号;
b) 试样和涂层的标识和状态;
c) 选用设备的触头总面积,645mm2 或1000mm2;
d) 测试结果:表面绝缘电阻系数或层间电阻系数。
3 涂层附着性的测试方法
3.1 装置
装置是直径分别为10mm、20mm、30mm,公差为-0.5mm~+0.1mm的表面光滑的黄铜圆
柱体。
3.2 试样
在离钢带(片)边部不小于40mm的地方,沿平行于轧制方向剪切具有代表性的试样,不得损伤试
样涂层。试样的尺寸:宽度为30mm±0.2mm,长度为280mm~320mm。如有特殊要求,供需双方协
商确定。
3.3 测试
在室温下,将试样紧紧围绕黄铜圆柱体弯曲180°,再将弯曲后的试样扳直,检查试样内表面涂层的
剥落情况。一般最先使用20mm黄铜圆柱体弯曲,如必要再使用10mm或30mm黄铜圆柱体弯曲。
3.4 评级
如无特殊要求,钢带(片)涂层绝缘附着性按表1评级。
3.5 测试报告
测试报告至少包括以下信息,除非另有约定:
a) 本标准编号;
b) 试样和涂层的标识和状态。
GB/T 2522-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.040.99
H 21
Replacing GB/T 2522-2007
Methods of Test for the Determination
of Coating Insulation Resistance and
Coating Adhesion of Electrical Strip and Sheet
(IEC 60404-11.2012, Magnetic Materials - Part 11. Method of Test for the
Determination of Surface Insulation Resistance of Magnetic Sheet and Strip, NEQ)
ISSUED ON. JULY 12, 2018
IMPLEMENTED ON. APRIL 01, 2018
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Coating Insulation Resistance Test ... 5
3 Test Method of Coating Adhesion ... 10
Foreword
This Standard was drafted as per the rules specified in GB/T 1.1-2009.
This Standard replaced GB/T 2522-2007 Methods of Test for the Determination of
Surface Insulation Resistance and Lamination Factor of Electric Sheet and Strip;
compared with GB/T 2522-2007, this Standard has the major changes as follows.
--- Change the standard name from Methods of Test for the Determination of
Surface Insulation Resistance and Lamination Factor of Electric Sheet and Strip
to Methods of Test for the Determination of Coating Insulation Resistance and
Coating Adhesion of Electrical Strip and Sheet;
--- Modify the test circuit diagram of coating insulation resistance;
--- Delete the test method B of coating insulation resistance;
--- Add test method with total area of 10 contacts of 1000mm2;
--- Modify the provisions of the total current of 10 contacts;
--- Add the calculation of interlayer resistance coefficient;
--- Add the repeatability and reproducibility requirements for the coating insulation
resistance test;
--- Add the coating adhesion levels.
This Standard was prepared by using re-drafting law and with reference of IEC 60404-
11.2012 Magnetic Materials – Part 11. Method of Test for the Determination of Surface
Insulation Resistance of Magnetic Sheet and Strip; the consistency with IEC 60404-
11.2012 is not equivalent.
This Standard was proposed by China Iron and Steel Industry Association.
This Standard shall be under the jurisdiction of National Technical Committee for
Standardization of Steel (SAC/TC 183).
Drafting organizations of this Standard. Wuhan Iron and Steel Company Limited,
Baoshan Iron & Steel Co., Ltd., Shougang Corporation, and China Metallurgical
Information and Standardization Institute.
Chief drafting staffs of this Standard. Liu Jizhong, Shen Jie, Xiang Qian, Shi Jianrui,
Wang Yujie, Hu Shoutian, Tang Ling, Gong Jian, Liu Baoshi, Wei Haili, Zhou Xing, and
Qiu Yi.
Methods of Test for the Determination
of Coating Insulation Resistance and
Coating Adhesion of Electrical Strip and Sheet
1 Scope
This Standard specifies the test methods for the determination of coating insulation
resistance and coating adhesion of electrical strip and sheet.
This Standard is applicable to the surface insulation resistance and interlayer
resistance test of non-oriented and oriented electrical steel strip and sheet; and the
insulation coating adhesion test of non-oriented and oriented electrical steel strip and
sheet.
2 Coating Insulation Resistance Test
2.1 Measurement principle
Franklin Method that can only perform single coating measurement shall be adopted.
The device circuit schematic diagram is shown in Figure 1. Under the specified voltage
and pressure, press 10 fixed-area metal contacts against a coating surface of the steel
plate. Evaluate the effectiveness of surface insulation coating by measuring the current
through 10 contacts.
Key.
by all contacts on the specimen under test.
2.4 Device confirmation
The confirmation of the device is suitable to take the following three types.
a) Under the rated test pressure, apply the contacts and the drilling bit to a clean
copper plate; the total current through the 10 contacts shall be 1.0×(1±3%)A; if
the actual situation doesn’t match, check the cleanliness of the contacts, the
sharpness of the drilling bit and the contact resistance.
b) Under the rated test pressure, pressure the carbon paper onto the white paper
through the contacts; at this time, even indentation occurs instead of the sign of
measurement board that exerts pressure and is displayed by changing the color
density.
c) Successively connect the 0.1Ω, 1Ω, 10Ω and 100Ω standard resistances in
between the drilling bit and contact pole-shoe; the indication value is stable and
reach the required current level.
2.5 Test procedures
2.5.1 Place the specimen between the test bench and 10 contacts; slower exert a
certain force. exert the force of 1290×(1±5%)N to the total area of 645mm2; exert the
force of 2000×(1±5%)N to the total area of 1000mm2, which is equivalent to the
2.5.2 Power the electrode with a regulated power supply, and read the total current
(or read by the computer).
2.5.3 If the test is to evaluate the single-side coating insulation quality, take 10 data
by the 10 contacts on the 10 representative different areas or 10 test specimens.
2.5.4 If the test is a comprehensive evaluation of double-side coating insulation
quality, the 10 contacts shall be tested on 5 representative areas selected from one-
side of the steel plate or 5 test specimens; the two-side test shall not be performed
within the same area of the test specimen.
2.6 Calculation of coating insulation resistance
Introduce the 10 measured current values of the 10 parallel contacts into Formula (1),
calculate and obtain the surface insulation resistance coefficient (there are 10
measured values for single-side coating, or 5 measured values on each side of the
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