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GB/T 7791-2014: Test method for performance of reducing frictional resistance of antifouling coatings
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Std ID	Version	USD	Buy	Deliver [PDF] in	Title (Description)
GB/T 7791-2014	English	189	Add to Cart	3 days [Need to translate]	Test method for performance of reducing frictional resistance of antifouling coatings
GB/T 7791-1987	English	199	Add to Cart	2 days [Need to translate]	Test method for performance of reduces frictional resistance of self-polishing antifouling coatings--Method of round dish rotor moments

GB/T 7791-2014: Test method for performance of reducing frictional resistance of antifouling coatings

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Test method for performance of reducing frictional resistance of antifouling coatings ICS 87.040 G50 National Standards of People's Republic of China Replacing GB/T 7791-1987 Performance test methods for antifouling paint drop resistance coatings 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 replaces GB/T 7791-1987 "self-polishing antifouling performance test method for resistance reducing torque disc method." This standard GB/T 7791-1987 compared to the main technical changes are as follows. --- Increasing the normative references, specify the relevant standard test procedure involved (see Chapter 2); --- Test method using a cylinder instead of the original disc standard test methods (see Chapter 7, Chapter 21 987 Edition); --- Resistance test specimen mounting vertical plug-in, replacing the standard level of plug-in (version 8.4,1987 see Chapter 4); --- Increased navigation simulation test procedure to rotate Seawater replaced the original standard seawater simple immersion (see edition 6.3,1987 chapter 2); --- Constant increase of seawater temperature control, through to circulating seawater temperature control system and navigation simulation test tank temperature control box (See 8.3); --- Increased the torque sensor calibration procedure (see Chapter 10); --- Increased the specimen coating thickness, surface roughness measurement (see 8.1, 8.2). The standard proposed by China Petroleum and Chemical Industry Federation. This standard by the National Standardization Technical Committee paint pigment (SAC/TC5) centralized. This standard was drafted. China Shipbuilding Industry Corporation seventh twenty-five Institute, China Shipbuilding Industry Corporation seventh Research Linger The CNOOC Changzhou coating Chemical Research Institute. The main drafters of this standard. Yao Jinghua, Aplication Korea Jin, REN Tao, Zhang Ye group, with Wei Mai, Suchun Hai. This part of the standard replaces the previous editions are. --- GB/T 7791-1987. Performance test methods for antifouling paint drop resistance

1 Scope

This standard specifies the test principle laboratory testing antifouling resistance reduction performance, torque calculation formulas, test device, a cylindrical sample size, Test procedures, data processing, calibration and test reports torque sensor. This standard applies to abrasive type, self-polishing type and fouling off easily type (FRC) antifouling paint drop resistance performance measurement.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein Member. For undated references, the latest edition (including any amendments) applies to this document. GB/T 3186 Paints, varnishes and raw materials for paints and varnishes - Sampling Determination of cathodic stripping properties GB/T 7790-2008 Paints and varnishes exposed to sea water resistant coating GB/T 8923.2-2008 visual assessment of steel substrates before application of paints and surface cleanliness - Part 2. already coated Local steel surface treatment after the removal of previous coatings Ratings Part 3 of the steel surface roughness characteristics of blast - cleaned steel substrates before GB/T 13288.3-2009 coated paint Score. calibration and surface roughness measurement method ISO surface roughness comparison specimens microscope focusing method Determination of GB/T 13452.2 Paints and varnishes thickness

3 Terms and Definitions

The following terms and definitions apply to this document. 3.1 Drop resistance performance thecapabilityofreducingfrictionalresistance Ability to reduce the frictional resistance between the seawater and the coated surface. 3.2 Lower resistivity theratioofreducingfrictionalresistance Antifouling coatings in friction compared to antifouling coatings and seawater Seawater initial frictional action for some time, the friction resistance Percent reduction in force. Principle 4 This method is by measuring the torque of a coated cylindrical specimen antifouling coating at a rotational speed of the water when the turbulent state, obtained a Resistance at a speed of antifouling coatings and water interface, combined with sailing simulations, comparing before and after coating seawater erosion resistance at the same speed Change in force, can be measured and evaluated by an antifouling paint drop resistance performance and lower resistivity. 5 the torque (resistance) is calculated Torque cylindrical sample size and sample cylinder radius ﹑ height, rotation speed ﹑ seawater density, can be used formula (1). ...