ASTM D5796-2010

ASTM D5796用鉆孔裝置進行破壞法測量薄膜涂覆系統(tǒng)的干膜厚度的標準試驗方法

ASTM D5796-2010發(fā)行信息

標準號 ASTM D5796-2010

中文名 用鉆孔裝置進行破壞法測量薄膜涂覆系統(tǒng)的干膜厚度的標準試驗方法

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

發(fā)布日期2010

實施日期

廢止日期無

中國標準分類號A29

國際標準分類號17.040.20

發(fā)布單位US-ASTM

ASTM D5796-2010適用范圍

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.)

與非破壞性方法相比，通過物理切割薄膜和光學(xué)觀察和測量厚度來測量有機涂層的干膜厚度具有直接測量的優(yōu)勢。

涂層系統(tǒng)總厚度的組成涂層通常可通過本試驗方法單獨測量，前提是各層之間的附著力足夠。（但是，如果底漆、面漆或多層涂層具有相同或非常相似的外觀，這可能會很困難。）

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.