GB/T 30648.2-2015Paints and varnishes -- Determination of resistance to liquids -- Part 2: Water immersion method (English PDF)

Foreword

GB/T 30648 "Paints and varnishes - Determination of resistance to liquids"

consists of the following 5 parts.

- Part 1. Immersion in liquids other than water;

- Part 2. Water immersion method;

- Part 3. Method using an absorption medium;

- Part 4. Part 4. Drip method;

- Part 5. Temperature - gradient oven method.

This Part is the second part of GB/T 30648.

This Part was drafted in accordance with the rules given in GB/T 1.1-2009.

This Part uses redrafting method to modify and adopt ISO 2812-2.2007 "Paints

and varnishes - Determination of resistance to liquids - Part 2. Water immersion

method".

There are technical differences between ISO 2812-2.2007 and this Part. The

terms involved in these differences have been marked by a single vertical line

(|) at the margin of the page. Appendix A gives a list of corresponding technical

differences and reasons.

This Part also makes the following editorial changes.

- The serial number of Clause 4 is modified to column-list;

- This Part adds the informative Appendix A.

This Part was proposed by China Petroleum and Chemical Industry Federation.

This Part shall be under the jurisdiction of National Standardization Technical

Committees (SAC/TC 5).

The drafting organizations of this Part. CNOOC Changzhou Paint & Coating

Industry Research Institute Co., Ltd., Heilongjiang Provincial Quality

Supervision and Inspection Institute, Guangzhou Research Institute of

Synthetic Materials, Shenzhen Grandland Decoration Group Co., Ltd.,

Guangzhou Research Institute of Synthetic Materials Co., Ltd. AND Biuged

Laboratory Instruments(Guangzhou)Co., Ltd.

Main drafters of this Part. Jiang Yun, Wang Chongwu, Li Xin, Li Shaoqiang, Qi

Feng and Sun Lide.

Paints and varnishes - Determination of resistance to

liquids - Part 2. Water immersion method

1 Scope

This Part of GB/T 30648 specifies a method for determining the resistance of

an individual-layer or multi-layer system of coating materials to the effects of

water by partial or full immersion.

This method enables the determination of the effects of water on the coating

and the assessment of the damage to the substrate.

2 Normative references

The following referenced documents are indispensable for the application of

this document. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any

amendments) applies.

GB/T 3186 Paints varnishes and raw materials for paints and varnishes -

Sampling (GB/T 3186-2006, ISO 15528.2000, IDT)

GB/T 6682 Water for analytical laboratory use - Specification and test

methods (GB/T 6682-2008, ISO 3696.1987, MOD)

GB/T 7790 Paints and varnishes - Determination of resistance to cathodic

disbonding of coatings exposed to sea water (GB/T 7790-2008, ISO

15711.2003, MOD)

GB/T 9271 Paints and varnishes standard panels for testing (GB/T 9271-

2008, ISO 1514.2004, MOD)

GB/T 13452.2 Paints and varnishes - Determination of film thickness (GB/T

13452.2-2008, ISO 2808.2007, IDT)

GB/T 20777 Paints and varnishes - Examination and preparation of samples

for testing (GB/T 20777-2006, ISO 1513.1992, IDT)

ISO 4628-2 Paints and varnishes - Evaluation of degradation of coatings -

Designation of quantity and size of defects, and of intensity of uniform

changes in appearance - Part 2. Assessment of degree of blistering

Test pieces can either be partially or fully immersed. If partial immersion is

required, the test pieces should be immersed for three-quarters of their length.

If full immersion is required, the test pieces should be immersed such that the

water level is a minimum of 50 mm above the top of the test piece to avoid

waterline oxygen concentration difference effects.

Place the test panels in the tank for the specified period, rearranging them at

regular intervals of not more than 3 days. If water of grade 3 of GB/T 6682 is

used, replace the test water if at any time during the test it becomes turbid or

colored or its conductivity exceeds 2 mS/m, or if the oxygen content falls below

5 mg/L.

8 Evaluation

1514 to GB/T 9271; ISO 2808 to GB/T 13452.2;

ISO 3696 to GB/T 6682; ISO 15528 to GB/T 3186;

and ISO 15711 to GB/T 7790.

National standards

are easier to use

......