问一下，膜厚测量的问题？

beijing1017

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）。

zhanhongtu

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

sl_yuxuan

楼上正解！

zblhx84

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！

yaolion2007

ISO19840
参考

beijing1017

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

beijing1017

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.

beijing1017

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.
　

黑云压城

菜鸟又长了点见识，谢谢！

wang_7njcoating

高深 理解起来难也！

HJ120

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

zblhx84

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。