SH/T 0105-1992 Determination of oil film thickness of solvent-diluted rust-preventive oil

AI-translated method card — human verification pending. This is not an official translation of the standard. Unclear source values remain unverified; check the original standard and product certificate before use.

Card type: Test method

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

• Standard number: SH/T 0105-92
• Chinese title: Determination of oil film thickness of solvent-diluted rust-preventive oil
• English title: not provided in the available source
• Replacement relationship: replaces SY 2759-85
• Year confirmation: the source marks “(200(!year confirmation)”, suspected to be “2000year confirmation”, requires confirmation against the source standard (source-text extraction)
• Approval/implementation: approved by China Petrochemical Corporation 1992-06-06, implemented 1993-01-01
• Reference adoption: the film thickness test method in clause 5.19 of Japanese Industrial Standard JIS K2246-1989 “Rust-preventive oil”

2. Scope of application and non-applicability

• Scope of application: This standard applies to solvent-diluted rust-preventive oil.
• Non-applicability: not provided in the available source.

3. Method principle

Immerse the test specimen in the 500mL sample for 1min, then lift it out. After hanging vertically for 24h, determine the mass of the coating film on the test specimen. Calculate the coating film thickness from the density and mass of the oil film.

4. Reagents and materials (purity / preparation)

4.1 Reagents

• 5.1 Petroleum ether: 60～90℃, analytical reagent grade.
• 5.2 Anhydrous ethanol: chemical reagent grade.

4.2 Materials

• 4.2.1 Test specimen: meets the material and specification requirements for test specimens in the SH/T 0218 A method, with two holes punched on the short side of the test specimen, see the test specimen figure in the source text.
• 4.2.2 Polyester adhesive tape: namely insulating tape, width 15mm.
• 4.2.3 Absorbent cotton or medical gauze.
• 4.2.4 Emery cloth (or emery paper): grit 240.
• 4.2.5 Hook: made of stainless steel wire, diameter about 1mm.
• 4.2.6 White oil: meets the requirements of grade 32 in SH 0006, or meets the requirements of grade 26 or grade 36 in SH 0007, for oil bath use.

5. Instruments and equipment

• 4.1.1 Analytical balance: sensitivity 1mg (source text “li ngo”, requires confirmation against the source standard (source-text extraction)).
• 4.1.2 Vernier caliper: graduation value 0.02mm.
• 4.1.3 Explosion-proof air bath: capable of maintaining a constant temperature at 107℃±2℃ (or super thermostat: constant temperature range 50～110℃).
• 4.1.4 Flat-bottom porcelain evaporating dish: diameter 90mm.
• 4.1.5 Constant-temperature water bath: capable of maintaining the water bath temperature constant at 23℃±3℃.
• 4.1.6 Mercury thermometer: 0～50℃, graduation value 0.1℃; 0～150℃, graduation value 1℃ (source text “19c”, requires confirmation against the source standard (source-text extraction)).
• 4.1.7 Pycnometer: meets the wide-mouth type requirements in GB/T 2540, with a mark on the neck or a capillary ground-glass stopper, volume 25mL.
• 4.1.8 Glass pipette: with rubber bulb.
• 4.1.9 Beaker: 600mL.
• 4.1.10 Desiccator.
• 4.1.11 Hot and cold dual-purpose hair dryer.

6. Recommended operating conditions

• Sample temperature: 23℃±3℃.
• Oil immersion time: 1min.
• Lifting speed: about 100mm/min.
• Drying conditions: relative humidity below 70%, temperature 23℃±3℃, a clean place without direct sunlight and with little ventilation, natural drying 24h.
• Constant-temperature conditions for oil film density determination: 107℃±2℃, constant temperature 16h.

7. Sampling and sample preparation

7.1 Preparation of coated test specimens

• 6.1.1.1 Treat two test specimens according to the test specimen preparation in the SH/T 0218 A method.
• 6.1.1.2 Use a vernier caliper to measure the length, width, thickness and two hole diameters of each metal test specimen (accurate to 0.02mm), place in a desiccator, then calculate the total area of the coated part on the test specimen according to formula (1).
• 6.1.1.3 Hook the above metal test specimen firmly with a stainless steel wire hook and weigh it, and record the mass M1.
• 6.1.1.4 Cover the surface of the part 15mm from the lower edge of the test specimen with polyester adhesive tape.

7.2 Preparation of oil film density sample

• 6.2.1.1 Adjust the explosion-proof air bath or super thermostat to 107℃±2℃.
• 6.2.1.2 Place 25g of uniformly mixed sample respectively in two flat-bottom evaporating dishes with diameter 90mm, keep at constant temperature in an explosion-proof air bath or super thermostat at 107℃±2℃ for 16h, combine the evaporated residues as the sample for determining oil film density (sample amount not less than 5g). When using a super thermostat, it should be carried out in a fume hood, and care should be taken that there is no open flame.
• 6.2.1.3 Determine the oil film density ρ according to GB/T 2540.

8. Analysis procedure

• 6.1.2.1 Pour 500mL of the shaken rust-preventive oil into a beaker, stir thoroughly, remove bubbles on the sample surface and adjust its temperature to within 23℃±3℃.
• 6.1.2.2 Use a hook to vertically immerse the test specimen prepared according to 6.1.1 into the sample at 23℃±3℃, immerse for 1min, then lift vertically at a speed of about 100mm/min.
• 6.1.2.3 Hang the coated test specimen vertically on a rack, with the upper and lower edges of the test specimen horizontal. Natural drying for 24h under relative humidity below 70%, temperature 23℃±3℃, in a clean place without direct sunlight and with little ventilation.
• 6.1.3 After the coated test specimen reaches the specified drying time, insert a blade into the seam between the polyester adhesive tape covering the coating and the test specimen to peel off the polyester adhesive tape (the polyester adhesive tape may also be pulled off directly by hand).
• 6.1.4 Hook the coated test specimen firmly with the stainless steel wire hook in 6.1.1.3, perform a second weighing, and record the mass M2.
• 6.2 Determination of oil film density: after preparing the sample according to 6.2.1, determine the oil film density ρ according to GB/T 2540.

9. Qualitative and quantitative determination and calculation formulas

9.1 Total area of the coated part A (cm²), calculated according to formula (1):

A = 2(a−1.5)(b+c) + 2(b+πd)c − πd²/2 ··························· (1)

Where:

• a—— length of the test specimen, cm;
• b—— width of the test specimen, cm;
• c—— thickness of the test specimen, cm;
• d—— diameter of the round hole, cm;
• 1.5—— width of the polyester adhesive tape, cm.

(Note: the source formula (1) source-text extraction contains noise, such as “[unreadable character]‘z” “R·d2·,” etc.; the formula is presented in the above organized form, requires confirmation against the source standard (source-text extraction).)

9.2 Oil film thickness of each metal test specimen H (μm), calculated according to formula (2):

H = (m2 − m1) / (ρ · A) × 10⁴ ··························· (2)

Where:

• m1—— mass of the test specimen before coating, g;
• m2—— mass of the test specimen after coating, g;
• ρ—— oil film density, g/cm³;
• A—— total area of the coated part on the test specimen, cm².

(Note: the source formula (2) source-text extraction contains noise, such as “2 2 . , 0 4 1 X m2[unreadable separator]m ;”, requires confirmation against the source standard (source-text extraction).)

10. Precision

not provided in the available source.

11. Report

Take the arithmetic mean of the oil film thicknesses of the two test specimens as the determination result, and round to the first decimal place.

12. Referenced documents

• GB/T 2540 Determination of density of petroleum products (pycnometer method)
• SH 0006 Industrial white oil
• SH 0007 Cosmetic white oil
• SH/T 0218 Method for preparation of test specimens for rust-preventive oil and grease tests

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