Iron and steel parts prior to painting, degreasing
Date：2012/2/11
Source：原創(chuàng)
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This standard specifies the iron and steel materials and equipment, and components before, during coating, degreasing degree of test methods and evaluation standards.
This standard is applicable to test materials and equipment, parts prior to painting, degreasing degree of pass or fail.
2 Technical Requirements
2 1 of this standard the standard G-type polar solvents should be consistent with the performance of the Category A standard G-polar solvents.
2 of this standard A-type experience in the oil dipstick should be consistent with Appendix BA-type experience in oil dipstick performance indicators and inspection rules.
Three test methods
3.1 steel and iron and steel by degreasing clean, you should immediately according to the standards required by the assessment.
3.1 1 assessed according to the method prescribed by this standard, should be obvious water with clean non-metallic small stick to remove the inspection surface.
1.2 standard Type A inspection oil dipstick must be placed in a clean glass desiccator, noticeable discoloration, such as preservation and transportation process, is prohibited from moisture and chemical contamination and surface.
3.2 testing procedures follow the steps below.
3.2 1 on the surface of the horizontal position to the standard G polar solution 0.1ml (diameter of about 2mm dropper drops about 2 drops) drops in the be tested on the surface, then use a clean small glass rod roll out the solution, it covered and area of ??not less than 20mm × 40mm.
3.2 2 the surface of the upright position, with a straw 0.5ml standard G-type polar solvents evenly coated on the surface was seized.
3.2 with a special type A oil inspection test strips close to the membrane in solution, by 1min to observe the test strip color.
Test results of the assessment
4.1 Inspection results are divided into qualified and unqualified two.
4 2 A-type oil inspection test strip color status was complete, a continuous one, such as shown in Figure 4-1, is qualified.
Photos 4-1 by the A-type experience in the oil dipstick test that qualified diagram according to
4 3 A-type experience in greaseproof paper color status is not complete, not continuous, sparsely punctate or massive, such as shown in photos 4-2, is unqualified.
Photos 4-1 by the A-type experience in the oil dipstick test that qualified diagram according to oil is not divisible
Appendix A of the standard G-type polar solvents performance indicators (Supplement)
G-type polar solvents is a light blue transparent aqueous solution consisting of an organic acid and metal sulfate, and drop it on the inspection of steel smooth surface, and then paste the A-type experience in the oil dipstick can be complete, continuous, uniform reddish brown, in order to test the iron and steel parts surface degreasing before painting is complete, the performance indicators are as follows.
The appearance of the A1, to clarify the transparent light blue aqueous solution, no significant precipitation.
A2, pH value of 6 to 7.
A3, no pungent odor, no corrosion to the skin.
A4 solution of chloride ion (Cl ˉ) content should not exceed 1ml / L.
A5 storage period: one year.
Appendix BA-type experience in the oil dipstick performance indicators and inspection rules (Supplementary)
A-type experience in the oil dipstick is a surface area of ??the 20mm × 40mm, color, slightly pale yellow paper, attached to the iron and steel parts on the surface of the existing standard G-polar solvents can be complete, continuous and uniform reddish brown, the performance indicators are as follows.
B1 Appearance: white slightly yellow, before use, the paper does not allow the spots of other colors.
The B2 chromogenic speed: close to the oil-free, smooth, coated with G-type polar solvents steel within 1min should be able to uniform reddish brown.
B3 on the skin without irritation.
B4 shelf life: One year.
Appendix C with the reliability of the weighing method test experience in the oil dipstick (Supplement)
Weighing method is one of the methods recommended by the current domestic and international inspection and degreasing degree of very accurate, but should not be in the workshop production site test time spent in a long time, so only in the laboratory as a check A-type examination of the reliability of the oil dipstick, as follows.
C1 take the smooth stainless steel plate, its size is 20mm × 40mm × 1mm, the use of clean gasoline or other organic solvent to scrub the surface of oil to the surface with the naked eye no obvious traces of the oil, then place in the atmosphere of volatile 20min then placed in alkaline addition to oil degreasing 10min, removed, rinsed with tap water under the faucet, hot air drying, and immediately placed in 60 ° C oven drying 1h, removed, placed in glass desiccator to cool.
C2 remove the dry plate, on the analytical balance (a sense of the amount of 0.0001g) on ??the weight of the weight of A0.
C3 the steel plate removed from the balance drops 2 drops on the 20th of the oil on its surface with a glass rod, it is evenly spread immediately after the C1 method of degreasing, weighing the weight of A1, so once or more until P equals zero or less than 0.12g/m2 date. The simple formula is as follows:
The formula
P =
Where P - left on the plate after degreasing oil content, mg/m2,;
A1 - degreasing steel plate degreasing the weight;
A0 - blank plate quality;
S - the entire surface area of ??the steel plate.
Inspection and verification, using the above method degreasing of steel plate surface, Type A inspection of the experience of the oil dipstick, bound to be a qualified pattern. Inspection of oil dipstick is believed to be reliable.
Additional notes:
This standard from the machinery and electronics of the People's Republic of China Ministry of Industry, under the jurisdiction of Guangzhou Electrical Apparatus Research Institute.
Responsible for drafting the standards by the Guangzhou Electrical Apparatus Research Institute.
The main drafters Chenke Zhong, Wu Miaoqing Yucheng Kang.