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GB/T 30789.9-2014: Paints and varnishes -- Evaluation of degradation of coatings -- Designation of quantity and size of defects, and of intensity of uniform changes in appearance -- Part 9: Assessment of degree of filiform corrosion
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Paints and varnishes -- Evaluation of degradation of coatings -- Designation of quantity and size of defects, and of intensity of uniform changes in appearance -- Part 9: Assessment of degree of filiform corrosion
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GB/T 30789.9-2014
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PDF similar to GB/T 30789.9-2014
Basic data | Standard ID | GB/T 30789.9-2014 (GB/T30789.9-2014) | | Description (Translated English) | Paints and varnishes -- Evaluation of degradation of coatings -- Designation of quantity and size of defects, and of intensity of uniform changes in appearance -- Part 9: Assessment of degree of filiform corrosion | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G50 | | Classification of International Standard | 87.040 | | Word Count Estimation | 9,940 | | Date of Issue | 7/8/2014 | | Date of Implementation | 12/1/2014 | | Adopted Standard | ISO 4628-10-2003, 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 scratches caused by measuring filiform corrosion longest filament length L and the most frequent filament length M thus assessed filiform corrosion method. Appendix A of this standard by the legend of filiform corrosion longest | GB/T 30789.9-2014: Paints and varnishes -- Evaluation of degradation of coatings -- Designation of quantity and size of defects, and of intensity of uniform changes in appearance -- Part 9: Assessment of degree of filiform corrosion
---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 Evaluation of degradation of coatings Designation of quantity and size of defects, and of intensity of uniform changes in appearance Part 9.. Assessment of degree of filiform corrosion
ICS 87.040
G50
National Standards of People's Republic of China
Paints and varnishes - Evaluation of degradation of coatings defects
The number and size, and degree of uniform changes in appearance
Logo Part 9. Evaluation of filiform corrosion level
quantityandsizeofdefects, andofintensityofuniformchangesin
appearance-Part 9. Assessmentofdegreeoffiliformcorrosion
(ISO 4628-10.2003, 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
GB/T 30789 "Paints and varnish coating aging rating number and size of the defect and the identity of the extent of uniform changes in appearance."
Divided into the following nine sections.
--- Part 1. General and identification systems;
--- Part 2. Evaluation of blistering levels;
--- Part 3. Evaluation of rust grade;
--- Part 4. Evaluation cracking grade;
--- Part 5. Evaluation of flaking grade;
--- Part 6. Assessment of degree of chalking tape method;
--- Part 7. Method for Evaluation of velvet cloth chalking rating;
--- Part 8. scribe or other artificial defect assessment and corrosion peeling peripheral level;
--- Part 9. Evaluation of filiform corrosion level.
This section GB/T Part of 930,789.
This section drafted in accordance with GB/T 1.1-2009 given rules.
This section uses the translation method identical with ISO 4628-10.2003 "Paints and varnish coating aging quantity evaluation of defects and large
Part 10 small degree of uniformity and appearance change logo. Evaluation of filiform corrosion level. "
This part is proposed by the China Petroleum and Chemical Industry Association.
This part of the National Standardization Technical Committee and the pigment coating (SAC/TC5) centralized.
This section drafted by. CNOOC Changzhou coating Chemical Research Institute, Changzhou brilliant Chemical Co., Ltd. Shaanxi limited Baotashan paint Shares
The company, Zhuhai fluorine Technology Co., Ltd, Nanjing Product Quality Supervision and Inspection Institute, Shenzhen Hirota Decoration Group Co., Ltd., of Ocean
Power Research Institute.
The main drafters of this section. Cao Xiaodong, Zhaoshao Hong, Liu Xiaoqing, Houhan Ting, Zhou Jun expensive, Lishao Jiang, Ding Liqun.
Paints and varnishes - Evaluation of degradation of coatings defects
The number and size, and degree of uniform changes in appearance
Logo Part 9. Evaluation of filiform corrosion level
1 Scope
This section GB/T 30789 is given by measuring the scratches caused by filamentous corrosion longest filament length L and the most frequent
Filaments filiform corrosion length M thus assessed approach.
Part A of this Appendix with the legend of filiform corrosion longest filament length L and the most frequently occurring filaments of different lengths M
grade. Appendix A test model in Figure 12 Comparative figures can not replace the necessary assessment (Tier 1 or Tier 2).
2 Terms and definitions
The following terms and definitions apply to this document.
2.1
Filiform corrosion filiformcorrosion
Occur in paint, varnish or related products, coatings, usually from the exposed edges of coating or partial destruction of a linearly beginning
corrosion.
Note 1. the usual filiform corrosion and extend the length direction is erratic, but they can be regarded as approximately parallel and approximately of equal length.
Note 2. filiform corrosion may also occur under other protective coating.
Note 3. In general, the filamentous texture metal corrosion along the substrate surface extending across not cross, and was originally caused by the corrosive ions.
[GB/T 13452.4-2008 and GB/T 26323-2010]
3 Ratings
3.1 General
Assessed under good lighting conditions.
3.2 Method 1
For regular filamentous corrosion [see Figure 1a)], comprising.
--- Are measured out by the scratches to filiform corrosion to the left and to the right of development longest filament length Ll and Lr [see Figure 1a)], in milli
Meters, calculate the average of Ll and Lr L;
--- Are measured out by the scratches to filiform corrosion to the left and the most frequent filament length Ml to the right of development and Mr [see Fig.
1a)], in millimeters, the average value calculated Ml and Mr M.
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