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GB/T 30786-2014: Paints and varnishes -- Guidelines for the introduction of scribe marks through coatings on metallic panels for corrosion testing
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 30786-2014 | English | 254 |
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Paints and varnishes -- Guidelines for the introduction of scribe marks through coatings on metallic panels for corrosion testing
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GB/T 30786-2014
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Basic data | Standard ID | GB/T 30786-2014 (GB/T30786-2014) | | Description (Translated English) | Paints and varnishes -- Guidelines for the introduction of scribe marks through coatings on metallic panels for corrosion testing | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G50 | | Classification of International Standard | 87.040 | | Word Count Estimation | 13,199 | | Date of Issue | 7/8/2014 | | Date of Implementation | 12/1/2014 | | Adopted Standard | ISO 17872-2007, IDT | | Regulation (derived from) | 2014 National Standards Bulletin No. 18 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This standard specifies the corrosion test specimens painted steel or scratch method, these painted steel or specimen coating system dry film thickness of less than 500 ��m. This standard is based on a number of collaborative test developed, these collabor | GB/T 30786-2014: Paints and varnishes -- Guidelines for the introduction of scribe marks through coatings on metallic panels for corrosion testing
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Paints and varnishes. Guidelines for the introduction of scribe marks through coatings on metallic panels for corrosion testing
ICS 87.040
G50
National Standards of People's Republic of China
Paints and varnishes - Corrosion test sheet metal coating
Scratch marks Guide
(ISO 17872.2007, IDT)
Issued on. 2014-07-08
2014-12-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This standard was drafted in accordance with GB/T 1.1-2009 given rules.
This standard uses the translation method identical with the international standard ISO 17872.2007 "Paints and varnishes - Corrosion test sheet metal coating scratches
Marking guidelines. "
This standard made the following editorial changes.
--- Deleted international standards foreword, introduction.
The standard proposed by China Petroleum and Chemical Industry Association.
This standard by the National Standardization Technical Committee paint pigment (SAC/TC5) centralized.
This standard was drafted. CNOOC Changzhou coating Chemical Research Institute, Taicang Polymer Materials R & D Center Co., Ltd., Shenzhen Hirota loaded
Decorative Group Co., Ltd., Guangzhou standard Geda laboratory equipment supplies Limited.
The main drafters of this standard. Cao Xiaodong, Lu Yong, Li Shaojiang, Wang Chongwu.
Paints and varnishes - Corrosion test sheet metal coating
Scratch marks Guide
1 Scope
This standard gives the corrosion test specimens painted steel or scratch method, the coating system dry film thickness of the specimen or painted steel
Less than 500μm. This standard is based on a number of collaborative test developed, these collaborative trials have not determined the applicability of corrosion scratches
test.
This standard applies to the following material scratches on a metal plate or specimen.
---steel;
--- Chemically treated steel;
--- Aluminum or aluminum alloy;
--- Chemically treated aluminum.
Does not apply in galvanized sheet metal, plated metal plate or panel clad aluminum scratch test.
2 scratches shape
Unless otherwise specified or agreed upon, the shape of scratches is X-shaped, T-shaped or a single line, are designated through the coating to the metal substrate. X-shaped, T-shaped
Or a single line schematic diagram shown in Figure 1. Depending on the degree of corrosion and the expected thickness of the coating, the typical length is suitable scratch
50mm to 70mm.
The length of the scratches should be significantly larger than expected after the corrosion test spread width.
Scratch width corrosion test results are also affected. The narrower the scratch, exposed metal surfaces due to the accumulation of a small amount of dissolved corrosion products
Liquid and passivation, the stronger the trend. So choose a suitable tool in order to draw the appropriate width of the scratches to the corrosion test is very
important.
Direction scratches often have a considerable impact on the results of corrosion tests. Such as. In the salt spray test, in the vertical direction and the smaller
Placed on the angle template, horizontal scratches will accumulate more salt solution. Distribution of saline solution in the horizontal scratches are more uniform, and the diagonal or vertical
Straight scratches, easy to produce a gradient distribution, increasing downward solution scratches, increasing the salt solution will result in accelerated corrosion rates, but Tu
Paint on steel plate, high salt concentration may inhibit corrosion, corrosion products because it forms very dense.
Scratch scratch along the entire length of the cross-sectional direction should be uniform as possible. The direction of the scratches, coating smooth cut. according to
The choice of different tools scratches, scratches cross-sectional shape may be "V" -shaped or "U" shape, and for the "V" notch a > b > c, "U-shaped
Incision a > b. The shape of the "V" and "U", require width b≥0.2mm (description of the symbols in Figure 2). Specific tools scratches
You can also draw a rectangular cross-section, a, b and c are approximately equal.
NOTE. scratches shape, depending on the depth and uniformity scratch hand tools, and also operator concerned scratches. To reduce the human factor for the subsequent corrosion test results
Effect of fruit, if automated streaking can be drawn through the coating to metal substrates scratch, you can use automated streaking device to scratches. Automatic scratch can also draw
A scratch rectangular cross section, a, b, c is about the same and are greater than 0.5mm.
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