SH/T 0581-1994 Rolling fluid rust performance test method

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Card type: Test method

1. Method number / full name / English name / replacement relationship

• Method number: SH/T 0581-94
• Full name: Rolling fluid rust performance test method
• English name: not provided in the available source
• Replacement relationship: not provided in the available source
• Other: approved by 1994-03-10, implemented by 1994-10-01; (confirmed in 2004)

2. Scope of application and non-applicability

• This standard specifies the test method for the rust performance of test specimens.
• This standard applies to rolling fluids, including full oil and emulsions.
• Not applicable: not provided in the available source.

3. Method principle

Under specified conditions, after polishing, cleaning and blow-drying the test specimen, coat it with the sample and place it in a constant-temperature and constant-humidity chamber. After the specified test time, take out the test specimen and clean it, then observe the surface of the test specimen, grade it according to the rust condition of the test specimen, so as to determine the rust resistance of the rolling fluid.

4. Reagents and materials (purity / preparation)

4.1 Reagents

• 5.1 Petroleum ether: 90～90℃ (requires confirmation against the source standard (source-text extraction), the source text is “[unreadable lower value and separator]90 `C”), analytical grade.
• 5.2 Anhydrous ethanol: analytical grade.
• 5.3 Acetone: analytical grade.
• 5.4 Chromium trioxide: chemical grade.

4.2 Materials

• 4.2.1 Test specimen
  • 4.2.1.1 45 steel: conforms to the high-temperature tempered state specification in GB/T 711. The steel test specimen dimensions are 50mm × 50mm × 3～5mm, hole positions are shown in Figure 1 (the source text is “Figure to [garbled figure reference]”, requires confirmation against the source standard (source-text extraction)).
  • 4.2.1.2 Aluminum LY12: conforms to the specification in GB/T 3190. The aluminum test specimen dimensions are 50mm × 50mm × 3～5mm, hole positions are shown in Figure 1 (the source text is “Figure to [garbled figure reference]”, requires confirmation against the source standard (source-text extraction)).
  • 4.2.1.3 Brass H62: conforms to the specification in GB/T 5231. The brass test specimen dimensions are 35mm × 35mm × 3～5mm, on one side a copper tube of diameter 18mm and length 30mm is welded vertically at the center (to make it less likely to slip when held by hand during polishing), the welded tube position is shown in Figure 2 (the source text is “Figure 2a”, requires confirmation against the source standard (source-text extraction)).
  • 4.2.1.4 Copper T3: conforms to the specification in GB/T 5231. The copper test specimen dimensions are 35mm × 35mm × 3～5mm, on one side a copper tube of diameter 18mm and length 30mm is welded vertically at the center (to make it less likely to slip when held by hand during polishing), the welded tube position is shown in Figure 2 (the source text is “Figure 20 [reference uncertain]”, requires confirmation against the source standard (source-text extraction)).
• 4.2.2 Medical gauze and absorbent cotton.
• 4.2.3 Emery cloth (or emery paper): grit 120 and 160.
• 4.2.4 Filter paper: qualitative filter paper.
• 4.2.5 Distilled water: at 20℃ the pH value is 6.0～7.0.

4.3 Sample preparation (6.2)

• 6.2.1 Take the full oil sample for coating the test specimen.
• 6.2.2 Prepare the soluble oil into an emulsion sample of 5%(m/m) 200mL (the source text is “200r L”, requires confirmation against the source standard (source-text extraction)) in a steel cup, stir on a 12000r/min high-speed stirrer for 1min (the source text is “I mi n”, requires confirmation against the source standard (source-text extraction)), then use for coating the test specimen.

5. Instruments and equipment

• 4.1.1 Constant-temperature and constant-humidity chamber: composed of temperature and humidity adjustment control devices, air delivery devices, water tank, etc. The chamber shall meet the following technical requirements.
  • 4.1.1.1 Temperature adjustment range: 50～70℃ (the source text is “50[unreadable separator]709 C”, requires confirmation against the source standard (source-text extraction)), temperature control accuracy ±1℃ (the source text is “tl` C”, requires confirmation against the source standard (source-text extraction)).
  • 4.1.1.2 Relative humidity: above 95%.
  • 4.1.1.3 The pH value of the water layer (distilled water) at the bottom of the chamber is 6.0～7.0 (the source text is “[garbled quantity name] value 6.[unreadable characters]7.0”, requires confirmation against the source standard (source-text extraction)).
  • 4.1.1.4 Water droplets condensed on the chamber cover are not allowed to fall on the test specimens, and the sample dripping from the test specimens in the sample receiving enamel tray must not contaminate the water layer at the bottom of the chamber.
  • 4.1.1.5 The constant-temperature and constant-humidity chamber should be placed in a room with clean air and no pollution, and the ambient temperature should be maintained at 15～35℃ (the source text is “15 - 3590”, requires confirmation against the source standard (source-text extraction)).
• 4.1.2 Pre-grinding machine: polishing disc diameter 230mm, rotation speed 450～500r/min.
• 4.1.3 Metallographic polishing machine: polishing disc diameter 200mm, rotation speed 450～500r/min.
• 4.1.4 Blower: dual-purpose hot and cold.
• 4.1.5 High-speed stirrer: rotation speed 12000r/min; with steel cup 500mL.
• 4.1.6 Enamel tray.
• 4.1.7 Plastic cup: 150mL.
• 4.1.8 Tweezers.
• 4.1.9 Glass dropper: 2mL.
• 4.1.10 Hook: made of stainless steel wire, used for hooking the test specimen for sample coating.
• 4.1.11 Test tube rack: used for placing the test specimen after sample coating.

6. Recommended operating conditions

Test conditions (source table, source-text extraction has much noise, values require confirmation against the source standard (source-text extraction)):

Note: In the source table, “395”, “3 95”, “)95”, “3 95”, “l”, etc. are source-text extraction noise, and have been organized according to context as 95, 1, etc., all require confirmation against the source standard (source-text extraction).

7. Sampling and test specimen preparation

7.1 Preparation of test specimens (6.1)

• 6.1.1 Preparation of steel and aluminum test specimens
  • 6.1.1.1 Take three test specimens for each sample, polish the edges, four sides and two holes of the test specimens with 120 emery cloth, then grind and polish the surface of the test specimens on a pre-grinding machine, and before testing polish again with 160 emery cloth (the source text is “[unreadable grade] emery cloth”, requires confirmation against the source standard (source-text extraction)), with the grain parallel to the center line of the two holes, and finally the roughness reaches 0.1μm (the source text is “o l y[unreadable unit character]”, requires confirmation against the source standard (source-text extraction)). After removing sand particles from the test specimens, wrap them in filter paper and immediately place them in a desiccator. The storage time must not exceed 24h, otherwise polish again.
  • 6.1.1.2 Take four clean plastic cups, respectively containing petroleum ether, petroleum ether, anhydrous ethanol, anhydrous ethanol, use tweezers to pick up absorbent cotton and wipe the steel and aluminum test specimens in the above order, for use in coating the sample.
• 6.1.2 Preparation of brass and copper test specimens (hereinafter referred to as copper test specimens)
  • 6.1.2.1 Take two test specimens for each test, and polish the edges and four sides of the test specimens smooth and round.
  • 6.1.2.2 First grind the test specimens on a pre-grinding machine, then on a metallographic polishing machine, while grinding add a mixed abrasive of chromium trioxide and water for polishing, so that the surface of the copper test specimen is bright as a mirror.
  • 6.1.2.3 Wash off excess mixed abrasive with water. After drying, soak in acetone for 2h, carefully wipe the surface of the test specimen dry with absorbent cotton, leaving no stains, for use in the test.
• 6.1.3 After polishing, the test specimens must not be touched by hand.
• 6.1.4 Before coating the sample, the cleaned and dried test specimens must be inspected; the surface of the test specimens must not have pits, scratches or rust marks.

7.2 Preparation of the constant-temperature and constant-humidity chamber system (6.3)

• 6.3.1 Before the test, first add distilled water to three-quarters of the height in the equipment water tank and the wet-bulb water box, and also fill the water storage bottle, used to gradually add distilled water to the water tank during the test, so as to maintain the water level in the water tank and avoid burning out the heating tube in the chamber due to water cut-off.
• 6.3.2 Adjust the temperature adjustment cap on the head of the rotating dry and wet bulb conductive meters, so that the temperature is set to the temperature value required for the test. The constant-temperature and constant-humidity chamber uses the dry-wet bulb method for humidity adjustment. First, according to the temperature required for the test, find the temperature value from the “dry bulb temperature” column in the “Relative Humidity Comparison Table” (see instruction manual), find the relative humidity value required for the test in the row corresponding to this temperature, the value in the “difference between dry and wet bulb” column corresponding to this relative humidity value is the difference between the dry bulb conductive meter and the wet bulb conductive meter, and the thermometer of the wet bulb conductive meter can be determined. For example, the temperature required for the test is 60℃ (the source text is “[unreadable value]℃”, requires confirmation against the source standard (source-text extraction)), the relative humidity is 95%, the difference between dry and wet bulb is found to be 1℃ (the source text is “19C”, requires confirmation against the source standard (source-text extraction)), then the wet bulb conductive meter should be set to 59℃ (the source text is “59`C”, requires confirmation against the source standard (source-text extraction)).
• 6.3.3 After everything is ready, turn on the power, blower and heating switches of the constant-temperature and constant-humidity chamber, the water tank switch, then turn on the humidification switch, check whether the motor and water pump are running normally, and wait for the test.

8. Analysis steps

• 7.1 Steel and aluminum test specimens coated with full oil sample: before taking the full oil sample, shake the oil sample well, pour it into a plastic cup, after the bubbles disappear, use a hook to hook up the test specimen, then slowly immerse the test specimen completely in the full oil sample, after 1min lift the test specimen (there must be no bubbles on the test specimen; if bubbles are found, repeat the above process), stack three pieces on the test tube rack in the enamel tray, and send them together into the constant-temperature and constant-humidity chamber, and carry out the test according to the test conditions specified in the table below.
• 7.2 Steel and aluminum test pieces coated with emulsion sample: Using a hook, slowly and completely immerse the test pieces in a uniformly stirred emulsion sample, 3s (the original text reads "3.", requires confirmation against the source standard (source-text extraction)), then lift the test pieces, stack three pieces flat on a test tube rack, place in a constant temperature and humidity chamber, and conduct the test according to the test conditions specified in the table below.
• 7.3 Copper test piece coated with full oil sample: Wipe dry with absorbent cotton a copper test piece that has been properly polished and soaked in acetone for 2h, use a glass dropper to drop 1 drops of a uniformly stirred full oil sample onto the center of the copper test piece polished to a mirror surface, then place another test piece with its mirror-polished surface face down on the copper test piece with the full oil sample, press firmly, place on a test tube rack, place in a constant temperature and humidity chamber, and conduct the test according to the test conditions specified in the table below.
• 7.4 Copper test piece coated with emulsion sample: Wipe dry with absorbent cotton a copper test piece that has been properly ground and polished and soaked in acetone for 2h, use a dropper to drop 4 drops of a uniformly shaken emulsion sample onto four points near the center of the test piece polished to a mirror surface, take another copper test piece and stack it on the copper test piece with the emulsion sample, press firmly, place on a test tube rack, place in a constant temperature and humidity chamber, and conduct the test according to the conditions specified in the table below.
• 7.5 When the constant temperature and humidity chamber reaches the specified test conditions, record the start time, run continuously for 8h, then stop operation (stop heating, ventilation, and humidification), do not open the chamber door, let stand for 16h, record as 1d.
• 7.6 Check and adjust the temperature, humidity, and water layer height at the bottom of the chamber twice a day.
• 7.7 If it is necessary to test at the same temperature and humidity but for different durations, the test pieces must be placed in or taken out during operation.
• 7.8 After the test period expires, immediately take out the test pieces, use medical gauze (or absorbent cotton) dipped in petroleum ether and anhydrous ethanol in sequence to clean the steel and aluminum test pieces, and acetone to wipe the copper test pieces, to remove the sample and loose corrosion products; dry the cleaned test pieces with hot air or air-dry them.

9. Qualitative and Quantitative and Calculation Formulas

8.1 Observation and Comparison

Compare the cleaned and dried test pieces with newly polished test pieces under sufficient light but avoiding direct sunlight, and observe the changes on the surfaces of both. For steel and aluminum test pieces, observe the corrosion of the three pieces: for the top first piece, observe the underside of the contact surface; the middle test piece has two sides, observe the side with heavier corrosion; for the third piece, observe the upward contact side.

8.2 Corrosion Degree Evaluation

8.2.1 Corrosion Degree Classification for Steel and Aluminum Test Pieces

• Grade 0—no discoloration (almost no change compared with the surface of a newly polished test piece).
• Grade 1—slight discoloration (uniform slight discoloration compared with the surface of a newly polished test piece).
• Grade 2—moderate discoloration (obvious discoloration compared with the surface of a newly polished test piece).
• Grade 3—deep discoloration (severe discoloration compared with the surface of a newly polished test piece).
• Grade 4—severe discoloration (obvious corrosion compared with the surface of a newly polished test piece).

Grading rules:

• When the corrosion grades of the three test pieces are the same, grade according to that same grade;
• When the corrosion of the three test pieces differs within two grades (including two grades) and two of them are of the same grade, grade according to the grade of the two test pieces of the same grade;
• When the corrosion grades of the three test pieces are all different but are adjacent grades, grade according to the middle piece;
• When the corrosion of two of the three test pieces differs by more than two grades, grading cannot be performed and the test must be redone.

8.2.2 Corrosion Degree Classification for Copper Test Pieces

• Grade 0—bright with almost no discoloration (same as a newly polished copper piece).
• Grade 1—slight uniform discoloration (light orange).
• Grade 2—moderate discoloration (orange, golden yellow spots).
• Grade 3—deep discoloration (deep orange, magenta spots).
• Grade 4—severe discoloration (brown, ink-colored spots).

Grading rules:

• When the corrosion grades of the two test pieces are the same, grade according to that same grade;
• When the corrosion grades of the two pieces are different, grade according to the more severely corroded piece.

Calculation formula: not provided in the available source.

10. Precision

Not provided in the available source.

11. Report

• 9.1 Test conditions.
• 9.2 Corrosion grade.

12. Referenced Documents

• GB/T 711 Technical conditions for hot-rolled thick steel plates of high-quality carbon structural steel and wide steel strips
• GB/T 3190 Chemical composition of wrought aluminum and aluminum alloy products
• GB/T 5231 Chemical composition and product forms of wrought copper and copper alloys

13. Source and verification

This page is an AI translation of the available Chinese method card. Human verification is pending. It is not an official translation of the standard. Check the source standard and product certificate before use.

14. Quick Reference Q&A