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标题: 问一下，膜厚测量的问题？ [打印本页]

作者: beijing1017 时间: 2011-9-1 13:06
标题: 问一下，膜厚测量的问题？
问一下，关于防腐涂料涂层膜厚测量。
膜厚的计算是否扣除锚纹深度？
就是如果测量结果为350微米，锚纹40-100微米，最终的膜厚是否计算为280微米（按70微米扣除锚纹深度）。

作者: zhanhongtu 时间: 2011-9-2 10:49
是要扣除锚纹深度的，具体怎么扣参考ISO19840
dry film thickness
DFT
thickness of a coating remaining over the peaks of a rough surface when the coating has hardened

作者: sl_yuxuan 时间: 2011-9-2 14:18
楼上正解！

作者: zblhx84 时间: 2011-9-5 20:59
本帖最后由 zblhx84 于 2011-9-5 20:59 编辑

测量方法和数据处理，要看：
1、所用的仪器类型；
2、测量所遵循的标准。
绝不是一种方法！

作者: yaolion2007 时间: 2011-9-15 07:23
ISO19840
参考

作者: beijing1017 时间: 2011-9-22 14:00
目前测量的是管道防腐，锚纹深度在40-100微米。采用德国EPK Minitest 600测厚仪测量。
在现场测量时直接记录测量数据。
但我觉得这样测量是不对的，应该扣除锚纹深度。
作为3PE涂层，FBE涂层要求低的为50微米--100微米，厚一些的在150-250微米。扣除锚纹深度是比较合理的。另外测量膜厚要求按ISO 2808 6A测量。AS3894.3

作者: beijing1017 时间: 2011-9-22 14:04
以下为 ISO2808 6A 内容
5.4.4 Method 6A — Cross-sectioning
5.4.4.1 Version 1 — By grinding
5.4.4.1.1 Apparatus and materials
5.4.4.1.1.1 Grinding and polishing machine
Apparatus which is used for producing metallographic preparations is suitable.
5.4.4.1.1.2 Embedding medium
Use a cold-setting resin that has no deleterious effect on the paint coating and gives gap-free embedding.
5.4.4.1.1.3 Grinding and polishing media
Use waterproof abrasive paper, for example 280, 400 and 600 grit, or suitable grades of diamond paste or a
similar paste.
5.4.4.1.1.4 Measuring microscope
Required is a microscope with a suitable illumination system giving optimum image contrast. The
magnification shall be chosen such that the field of vision corresponds to 1,5 to 3 times the film thickness. The
eyepiece or optoelectronic measurement device shall permit measurements to be made to an accuracy of at
least 1 μm.
5.4.4.1.2 Procedure
Embed the specimen or a representative sample of the specimen in the resin (5.4.4.1.1.2). Wet-polish the
specimen or sample using the grinding and polishing machine (5.4.4.1.1.1) along a plane normal to the
coating surface. Repeat this process with an ever-finer grade of abrasive. Measure the thickness(es) of the
exposed layer(s) using the microscope.
5.4.4.2 Version 2 — By cutting
5.4.4.2.1 Apparatus
5.4.4.2.1.1 Cutter
Required is a traversing or rotary microtome with carbide blades of suitable geometry and a holder for
clamping the specimen in place.
5.4.4.2.1.2 Measuring microscope
Required is a microscope with a suitable illumination system giving optimum image contrast. The
magnification shall be chosen such that the field of vision corresponds to 1,5 to 3 times the film thickness. The
eyepiece or optoelectronic measurement device shall permit measurements to be made to an accuracy of at
least 1 μm.
5.4.4.2.2 Procedure
Clamp the specimen or a representative sample taken from the specimen in the microtome specimen holder
and cut along a plane normal to the coating surface. Measure the thicknesses of the exposed layers using the
microscope.

作者: beijing1017 时间: 2011-9-22 14:25
在AS3894.3中对DRY FILM THICKNESS的定义

The thickness of the coating measured,At any location on the test surface　，above the peaks of the profile (anchor pattern or surface profile) of the substrate.
　

作者: 黑云压城 时间: 2011-10-21 13:52
菜鸟又长了点见识，谢谢！

作者: wang_7njcoating 时间: 2011-10-25 15:39
高深理解起来难也！

作者: HJ120 时间: 2011-11-8 22:11
理论是理论，自己看着用用行了！这理论是正确的，但是好多人根本不接受！一般人校准都是用零板，其实可以用打砂过的钢板校准就可以了

作者: zblhx84 时间: 2012-12-25 21:26

beijing1017 发表于 2011-9-22 14:00
目前测量的是管道防腐，锚纹深度在40-100微米。采用德国EPK Minitest 600测厚仪测量。
在现场测量时直接记 ...

不是扣锚纹深度，而是扣修正值。
但修正值与锚纹深度是相关的。

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