ASTM D5796-2010测试标准

ASTM D5796用钻孔装置进行破坏法测量薄膜涂覆系统的干膜厚度的标准试验方法

ASTM D5796-2010发行信息

标准号 ASTM D5796-2010

中文名 用钻孔装置进行破坏法测量薄膜涂覆系统的干膜厚度的标准试验方法

英文名 Standard Test Method for Measurement of Dry Film Thickness of Thin Film Coil-Coated Systems by Destructive Means Using a Boring Device

发布日期2010

实施日期

废止日期无

中国标准分类号A29

国际标准分类号17.040.20

发布单位US-ASTM

ASTM D5796-2010适用范围

Measurement of dry film thickness of organic coatings by physically cutting through the film and optically observing and measuring the thickness offers the advantage of direct measurement as compared with nondestructive means.

Constituent coating layers of an overall thickness of a coating system can usually be measured individually by this test method, provide adhesion between each layer is sufficient. (However, this can be difficult in cases where the primer, topcoat, or multiple coating layers have the same, or very similar, appearance.)

与非破坏性方法相比，通过物理切割薄膜和光学观察和测量厚度来测量有机涂层的干膜厚度具有直接测量的优势。

涂层系统总厚度的组成涂层通常可通过本试验方法单独测量，前提是各层之间的附着力足够。（但是，如果底漆、面漆或多层涂层具有相同或非常相似的外观，这可能会很困难。）

1.1 This test method covers the measurement of dry film thickness (DFT) of coating films by microscopic observation of a precision-cut, shallow-angle crater bored into the coating film. This crater reveals cross sectional layers appearing as rings, whose width is proportional to the depth of the coating layer(s) and allows for direct calculation of dry film thickness.

1.1.1 The Apparatus, Procedure, and Precision and Bias discussions include Method A and Method B. Method A involves the use of an optical measurement apparatus which is no longer commercially available, but remains a valid method of dry film measurement. Method B is a software driven measurement procedure that supersedes Method A.

1.2 The substrate may be any rigid, metallic material, such as cold-rolled steel, hot-dipped galvanized steel, aluminum, etc. The substrate must be planar with the exception of substrates exhibiting x201C;coil set,x201D; which may be held level by the use of the clamping tool on the drilling device.

Note 18212;Variations in the surface profile of the substrate may result in misrepresentative organic coating thickness readings. This condition may exist over substrates such as hot-dipped, coated steel sheet. This is true of all x201C;precision cutx201D; methods that are used to determine dry film thickness of organic coatings. This is why several measurements across the strip may be useful if substrate surface profile is suspect.

1.3 The range of thickness measurement is 0 to 3.5 mils (0 to 89 x03BC;m).

Note 28212;For DFT measurements of films greater than 3.5 mils (89x03BC;m), but less than 63 mils (1600 x03BC;m), a 45x00B0; borer may be used in accordance with this test method, with the exception of 6.8, where the micrometer reading would provide a direct read-out, and division by ten would be unnecessary per 4.3.1 Method A.

1.4 Measurements may be made on coil-coated sheet, certain formed products, or on test panels.

1.5 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.