JB/T 3206-1999 JB/T 3206-1999 Test method for accelerated condensation corrosion of rust-proof greases JB/T3206-1999 Standard download decompression password: www.bzxz.net
This standard is applicable to the rapid evaluation of the rust-proof properties of rust-proof oils and rust-proof greases with a film thickness of less than 0.04 mm. It can be used as a quality inspection and acceptance test for commercial rust-proof greases.

ICS25.220.01
Machinery Industry Standard of the People's Republic of China
JB/T3206—1999
Test method for accelerated dew corrosion of rust preventive oils and greases1999-06-28 Issued
National Bureau of Machinery Industry
2000-01-01 Implementation
JB/T3206—1999
This standard is a revision of JB3206-83 "Test method for accelerated dew corrosion of rust preventive oils and greases". During the revision, the original standard was edited and the main technical content remained unchanged. This standard replaces JB3206-83 from the date of implementation. This standard is proposed and managed by the National Technical Committee for Standardization of Metal and Non-metal Coverings. The drafting unit of this standard: Wuhan Institute of Material Protection. The main drafters of this standard are: Wu Laixing, Luo Yongxiu, Wu Zhengqian, Wang Cuilian, Chen Yuezhen. 0 Introduction
Machinery Industry Standard of the People's Republic of China
Test method for accelerated dew corrosion of rust preventive oils and greasesJB/T3206—1999
Replaces JB320683
This method is based on the dew point principle. The temperature difference between the oil film surface temperature of the metal test piece and the ambient air temperature is maintained, and the test piece surface is in a condensed state. After a certain period of time, the protective performance of rust preventive oils and corrosion inhibitors on the metal test piece under high temperature, high humidity and accelerated condensation conditions is examined. 1 Scope
This standard is applicable to the rapid evaluation of the rust prevention of rust preventive oils and greases with a film thickness of less than 0.04mm. It can be used as a quality inspection and acceptance test for commercial rust preventive oils.
2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. SH 00041990
Solvent oil for rubber industry
SH/T00801991Corrosion test method for rust-proof greaseSH/T02181992Preparation method for test piece of rust-proof greaseRust assessment method for rust-proof test piece of rust-proof greaseSH/T0533-1992
3 Equipment, materials and reagents
3.1 Equipment
The accelerated condensation corrosion test equipment (or device) should consist of a box, a heating and temperature control system, an air humidification, a flow control system, a circulating cooling water control system and a test stand. Each control system should meet the following technical requirements. 3.1.1 Box body
3.1.1.1 The inner wall of the box and other parts in contact with hot and humid air shall be made of corrosion-resistant materials. 3.1.1.2 The volume of the box shall not be less than 0.1m.
3.1.1.3 The lining cloth of the top cover of the box shall be made of synthetic fiber cloth that does not expand due to moisture. The mesh number of the cloth is 450~50 mesh per square centimeter.
The bottom of the box is equipped with drainage and sewage holes and valves. 3.1.1.5 Condensation water on the top cover is not allowed to drip on the surface of the test piece. 3.1.2 Heating and temperature control system
3.1.2.1 The temperature of the test box shall rise to the test temperature specified in 3.2.1 within 1 hour. 3.1.2.2 The test temperature fluctuation range is 1℃, and an over-temperature alarm power-off device is provided. Approved by the State Bureau of Machinery Industry on June 28, 1999 and implemented on January 1, 2000
3.1.3 Air humidification and flow control system
JB/T3206-1999
3.1.3.1 The air entering the box shall be filtered by the purification device and humidified by the microporous disperser from 10mm below the distilled water surface at the bottom of the box before entering the box. The pH value of distilled water is 5.5~7.5.3.1.3.2 The air flow can be adjusted and controlled.
3.1.4 The circulating cooling water control system consists of a cooling water tank, a pump, a heating temperature controller, a return pipe and a valve.3.1.4.1 The circulating cooling water temperature of the cooling water tank shall be adjustable and automatically controlled, and its temperature fluctuation range shall be ±1℃. 3.1.4.2 The temperature of the cooling water entering the test area should be kept constant at the inlet and outlet of the sample rack when the test pieces are fully loaded, and the maximum temperature difference allowed is 0.5℃.
3.1.4.3 The pump, return pipe and valve should meet the flow rate of 20~25L cooling water per minute, and the temperature of the cooling water should be kept in accordance with the requirements of 3.1.4.1 and 3.1.4.2.
3.1.5 Sample rack
3.1.5.1 The sample rack should be made of corrosion-resistant and heat-dissipating materials. 3.1.5.2 The sample rack should be placed on a flat surface, 60° to the horizontal, to ensure a good contact surface with the test pieces. Each shelf surface can stably place three (50mm×50mm) test pieces, with a test piece spacing of about 10mm. 3.1.5.3 There should be oil and water drainage grooves, and oil and condensation water should not be allowed to drip into the bottom water layer of the box. 3.1.5.4 The distance between the sample rack and the water surface at the bottom of the box should not be less than 200mm3.2 The equipment should meet the following test conditions.
3.2.1 Temperature inside the box: 50℃±℃
Circulating cooling water temperature: 30℃±1℃.
Temperature difference: 20℃+1℃.
Condensation amount: (40.5)mL/h/test piece.
3.2.5 Cooling water flow rate: (22+2)L/min. 3.2.6 Air flow rate: three times the volume of the space inside the box. 3.2.7 Air pressure difference between inside and outside the box: none.
3.2.8 Test method: continuous.
3.3 Condensation Amount Determination Device
Use a 50mm×50mm×(3~5)mm copper sheet, with copper water retaining plates with a thickness of 0.5~1mm and a width of 4~5mm welded on both opposite sides; a sloped water receiving trough is welded on the bottom, and the surface is plated with nickel and chromium. Use a rubber tube to connect the water receiving trough and a 20mL graduated test tube; the graduation value of the graduated test tube is 0.4mL. The device is shown in the schematic diagram (Figure 1). 3.4 Determination of Condensation Amount
3.4.1 Clean and dry the graduated test tube and the condensation amount determination device, and place them in the test box adjusted according to 3.2. When placing, pay attention to the selection surface close to the sample rack surface. The unpacking time shall not exceed 10min. 3.4.2 Record the test temperature, temperature difference, air flow rate, etc. according to Table 1 every 30min. After 4h, take out the graduated test tube to read the milliliters of condensed water and record it in the table.
JB/T3206-1999
150mm×50mmx（3-5）mm brass sheet: 3 Water trough: 4 Rubber connecting pipe: 5-Graduated test tube 2-Water baffle:
Temperature inside the box
Recording time
Schematic diagram of condensation amount measurement device
Cooling water temperature
3Calculate the average condensation amount according to the following formula:
Where: V-
Condensation amount, mL/h/test piece:
Total volume of condensation collected, mL;
Total number of condensation amount measurement devices:
Total number of hours for condensation amount measurement, h.
Air intake
Condensation
mLh/test piecewww.bzxz.net
JB/T3206-1999
3.4.4 The determination of condensation can be carried out regularly depending on the equipment conditions. 3.5 Materials and reagents
3.5.1 Test piece: 50mmx50mm×(3~5)mm, metal material is selected according to the provisions of SH/T0218. 3.5.2 Scraper: wooden or plastic sheet.
3.5.3 Sandpaper or emery cloth: particle sizes are 150, 180 and 240 mesh respectively. 3.5.4 Absorbent cotton (medical).
3.5.5 Absorbent gauze (medical).
3.5.6 Qualitative filter paper.
3.5.7 Anhydrous ethanol: chemically pure.
3.5.8 Solvent oil (in accordance with SH0004) or petroleum ether (chemically pure, 60~90℃). 4 Preparation of test specimens
The grinding, cleaning and oiling of the test pieces shall be carried out in accordance with SH/T0218. However, after oiling, the overlapping surface shall be placed flat on the qualitative filter paper, the oil layer shall be absorbed, and the test piece shall be hung in the drain box. For the test piece coated with anti-rust grease, the overlapping surface shall be scraped off the oil layer with a scraper, and an evenly thin oil film shall be allowed to remain, and the test piece shall be hung in the drain box.
5 Test steps
5.1 Place the prepared test piece in the condensation corrosion test box adjusted according to 3.2. When placing, the hole edge shall face downward and the selected surface shall be close to the sample rack. Cover the box lid and start recording the test time. 5.2 The test shall be carried out continuously, and the temperature, temperature difference and air intake shall be observed at any time. 5.3 According to the oil sample test requirements, check the rust condition of the test piece at least once every 4 hours. The unpacking time shall not exceed 10 minutes. 6 Result judgment and rating
6.1 After the test, take out the test piece and remove the oil film with solvent oil or petroleum ether, wipe it dry with degreased gauze, and then the ferrous metal test piece shall be rated according to SH/T0533: the non-ferrous metal test piece shall be rated according to SH/T0080: the rating is expressed in level/h. 6.2 The rating of the three test pieces shall be rated according to the following conditions. 6.2.1 When the rust level of the three test pieces is the same, they shall be rated at the same level. 6.2.2 When the rust level of the three test pieces differs by two levels (including two levels), and two of the test pieces are at the same level, they shall be rated according to the level of the two test pieces at the same level
6.2.3 When the rust levels of the three test pieces are different but belong to adjacent levels, they shall be rated according to the level of the middle test piece. 6.2.4 If the rust level of two of the three test pieces exceeds two levels, the test cannot be graded and the test needs to be repeated. 6.2.5 If the ferrous metal test piece changes color or darkens, it must be noted in the test report. 4
Mechanical Industry Standard
Test Method for Accelerated Condensation Corrosion of Rust-proof Grease JB/T3206—1999
Published by the Machinery Standardization Research Institute of the Ministry of Machinery Industry Printed by the Machinery Standardization Research Institute of the Ministry of Machinery Industry (No. 2 Shouti South Road, Beijing: Postal Code 100044)*
Book Size 880×1230
1/16 Sheet 1/2
Word Count 10000
First Edition July 1999
First Printing July 1999
Print Quantity 1-500
Price 500 Yuan
99-018
66690 /
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