SH/T 0218-1993 Preparation method of test specimens for rust-preventive oils and greases

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 name / English name / replacement relationship

• Method number (as stated in the original text): SH/T 0218-93
• Standard number inferred from file name: SHT-218-1993
• Full name: Preparation method of test specimens for rust-preventive oils and greases
• English name: not provided in the available source
• Replacement relationship: not provided in the available source
• Internal number (appearing in the original text): FNYSHFXYZ27501 / F-NY-SH-FXYZ-27501
• Structure: divided into two parts, Part One A method (Chapters 3 to 8), Part Two B method (Chapters 9 to 12)

2. Scope of application and non-applicability

• This method applies to rust-preventive oils and rust-preventive greases (Chapter 1).
• This method specifies the method for preparing test specimens for rust-preventive oils and greases (Chapter 2).
• Not applicable: not provided in the available source.

3. Method principle

• A method (Chapter 3): after the specified metal test specimen is polished and cleaned, prepare test specimens suitable for various rust-preventive oil and grease tests, and specify the method for applying the sample onto the test specimen.
• B method (Chapter 9): according to the test requirements, select the size and dimensions of the metal test specimen, and after polishing and cleaning, apply the sample onto the metal test specimen.

4. Reagents and materials (purity / preparation)

4.1 A method materials (4.2)

• Metal test specimen: material 10 steel, meeting the specification requirements of GB/T 711; specification A test specimen 3.0 to 5.0mm×60mm×80mm, B test specimen 3.0 to 5.0mm×80mm×60mm; Note: test specimens with thickness 1.0 to 3.0mm may still be used until used up; hanging holes: drill two small holes of diameter 3mm at the places shown in Figure 1.
• Absorbent cotton or medical gauze (4.2.2).
• Emery cloth (or emery paper): grit 240 (4.2.3).
• Hanging hook: made of stainless steel wire (4.2.4).
• Polyester adhesive tape: namely insulating tape, width 15mm (4.2.5).

4.2 A method reagents (Chapter 5)

• Anhydrous ethanol: chemically pure (5.1).
• Petroleum ether: 60 to 90℃, analytically pure (5.2).

4.3 B method materials (10.2)

• Medical gauze and absorbent cotton (10.2.1).
• Emery cloth (or emery paper): grits 150, 180 and 240 respectively (10.2.2).
• Metal test specimen: according to the product specification requirements of the sample, select from the table below or add other metal materials (10.2.3).

• Test specimen selection instructions (later part of 10.2.3): for salt spray test, humid heat test, semi-exposure test, replacement-type rust-preventive oil human sweat washing performance test, human sweat prevention performance test, and human sweat replacement performance test, use test specimens of 50mm×50mm×3 to 5mm; for corrosion test, use test specimens of 50mm×25mm×3 to 5mm. The dimensions of the test specimen and the positions of the small holes are shown in Figure 3 and Figure 4.

4.4 B method reagents (Chapter 11)

• Petroleum ether: 60 to 90℃, analytically pure (11.1).
• Anhydrous ethanol: chemically pure (11.2).

5. Instruments and equipment

5.1 A method instruments (4.1)

• Constant-temperature water bath: capable of maintaining constant temperature at 23℃±3℃ (4.1.1).
• Constant-temperature oil bath: constant-temperature range 50 to 110℃, fluctuation range ±1℃ (4.1.2).
• Analytical balance: sensitivity 1mg (4.1.3).
• Blower: dual-purpose hot and cold (4.1.4).
• Desiccator (4.1.5).
• Beaker: 500mL (4.1.6).
• Enamel cup (4.1.7).
• Tweezers (4.1.8).
• Vernier caliper: graduation value 0.02mm (4.1.9).
• Thermometer: 0 to 150℃, graduation value 1℃ (4.1.10).

5.2 B method instruments (10.1)

• Desiccator (10.1.1).
• Blower: dual-purpose hot and cold (10.1.2).
• Lifter: lifting speed approximately 100mm/min, see Figure 2 (10.1.3).
• Tweezers (10.1.4).
• Hanging hook: made of stainless steel wire (10.1.5).
• Enamel cup (10.1.6).
• Scraper (10.1.7).

6. Recommended operating conditions

• A method test specimen polishing: under dry conditions, polish both surfaces of the test specimen with emery paper or emery cloth until the surface roughness is 0.2 to 0.4 (original text written as “0.4 to 0.2”, requires confirmation against the source standard (source-text extraction)); A test specimen is polished parallel to the long side, B test specimen is polished parallel to the short side (6.2.1).
• A method test specimen cleaning: four enamel cups are respectively filled with petroleum ether, petroleum ether, anhydrous ethanol, and anhydrous ethanol at 60℃±2℃, and immersed and scrubbed in sequence (6.3).
• A method rust-preventive oil coating: sample temperature 23℃±3℃; test specimen immersed for 1min; lifting speed approximately 100mm/min (7.1.1, 7.1.2).
• A method rust-preventive grease coating: sample heated to the selected temperature; test specimen immersed until it reaches the same temperature as the sample; lifting speed approximately 100mm/min (7.2.1.4, 7.2.1.5).
• A method coating film thickness determination: when the measurement result is 38μm±5μm, this coating temperature is the selected coating temperature for the rust-preventive grease sample (7.2.1.10).
• A method coated test specimen drying: natural drying in a clean place with relative humidity below 70%, temperature 23℃±3℃, no direct sunlight and little ventilation for 24h (Chapter 8).
• B method rust-preventive oil coating: sample temperature 25℃±5℃; after the test specimen is fully immersed in 1min, slowly lift it out; after immersion, hang it in a draining box and drain for 2h at 25℃±5℃; when coating solvent-diluted rust-preventive oil and replacement-type rust-preventive oil samples, drain for 16 to 24h (12.3.2.2, 12.3.2.3).
• B method rust-preventive grease coating: when the oil film thickness reaches 0.04mm±0.005mm, record the temperature, and thereafter coat the specimen at this temperature (12.3.3.1.3).
• B method test specimen cleaning: four enamel cups are respectively filled with petroleum ether at 150mL or above, petroleum ether, anhydrous ethanol, and anhydrous ethanol at 50 to 60℃ (12.2).

7. Sampling and sample preparation

7.1 A method test specimen preparation (Chapter 6)

• 6.1 Pre-cleaning: immerse the test specimen in petroleum ether, use tweezers to hold absorbent cotton or medical gauze and gently wipe, wipe clean, and dry with hot air.
• 6.2 Polishing: according to 6.2.1, 6.2.2, polish both surfaces, edges and hanging holes; round the edges until there are no burrs, and use emery paper torn into thin strips to thread through and grind the hanging holes.
• 6.3 Cleaning: immerse and wash in the order of the four cups of solvent according to 6.3, use tweezers to hold absorbent cotton and wipe until polishing debris or contaminants are cleaned off; note that safety should be observed when heating anhydrous ethanol.
• 6.4 Drying: dry the cleaned test specimen with hot air and cool to room temperature.
• 6.5 Storage: if the test cannot be performed immediately, place it in a desiccator for storage; test specimens stored for 24h or more should be re-polished.

7.2 A method test specimen coating (Chapter 7)

• 7.1 Rust-preventive oils: after shaking uniformly, pour about 500mL of sample into a beaker, stir thoroughly, remove surface bubbles and adjust the temperature to 23℃±3℃; use a hanging hook to slowly immerse the test specimen vertically into 1min, then lift it vertically upward at a lifting speed of about 100mm/min; there must be no bubbles on the test specimen.
• 7.2 Rust-preventive greases: select the coating temperature according to 7.2.1.1 to 7.2.1.10 (measure the test specimen dimensions, weigh m1, cover with polyester adhesive tape at 15mm from the lower edge, heat the sample, dip-coat, peel off the tape, weigh a second time m2, measure the density of 23℃±3℃ according to GB/T 13377, calculate A and H, adjust the temperature to 38μm±5μm); 7.2.2 pour into a dry beaker 500mL at the selected temperature, and coat according to 7.2.1.5.

7.3 B method test specimen preparation (Chapter 12)

• 12.1 Polishing: polish the edges, four sides, and small holes with abrasive cloth number 150; polish the test surface with abrasive cloth number 180, with the grain parallel to the line connecting the centers of the two holes; for corrosion test specimens, the grain is parallel to the long edge; the surface must not have pits, scratches, or rust; steel and cast iron specimens may also first be ground smooth with a grinder, and before testing polished again with abrasive cloth number 180; non-ferrous metal specimens are polished with abrasive cloth number 240, and finally the surface roughness must all reach 0.2～0.4 (the source text writes “0.4～0.2”, requires confirmation against the source standard (source-text extraction)); lead specimens are scraped bright with the tip of a scraper to obtain a flat, fresh surface; after polishing, they must not be touched by hand; after the polished specimens have been freed of abrasive particles, wrap them with filter paper and immediately store them in a desiccator; the total time for storage, cleaning, and coating the test sample must not exceed 24h, otherwise polish again.
• 12.2 Cleaning: wipe in the order of the four cups of solvent according to 12.2, dry with hot air, cool to room temperature, then coat the test sample.
• 12.3 Coating: before coating, check that the test surface has no pits, scratches, or rust; for rust-preventive oils follow 12.3.2; for rust-preventive greases follow 12.3.3.

8. Analytical procedure

• A method: Chapter 6 specimen preparation → Chapter 7 coating → Chapter 8 drying (natural drying 24h).
• B method: Chapter 12 specimen preparation (polishing, cleaning, coating) → coat according to 12.3.2 or 12.3.3 → test after draining/cooling to room temperature.
• For the coating temperature selection procedure, see 7.2.1 (A method) and 12.3.3.1 (B method).

9. Qualitative and quantitative determination and calculation formulas

9.1 A method

• Total area of the coated film portion on the specimen A (cm²), formula (1): A = 2(a−1.5)×b + 2(a−1.5)×c + 2bc + 2πdc − πd² = 2(a−1.5)(b+c) + 2(b+πd)×c − πd² Where: a— length of the specimen, cm; b— width of the specimen, cm; c— thickness of the specimen, cm; d— diameter of the hanging hole, cm; 1.5— width of the polyester adhesive tape, cm.
• Oil film thickness H (μm), formula (2): H = (m2−m1)/(A·ρ) × 10⁴ Where: m1— mass of the specimen before coating, g; m2— mass of the specimen after coating, g; ρ— density of the test sample (unless otherwise specified, the density of rust-preventive grease may be calculated as 0.9g/cm³), g/cm³; A— total area of the coated film portion on the specimen, cm², calculated according to formula (1). (The source formula (2) is typeset as a fraction with a 10⁴ factor, source-text extraction appears as “H=4 1 2 10 × ⋅ − A m m ρ”, requires confirmation against the source standard (source-text extraction))

9.2 B method

• Oil film thickness of the specimen coated with the test sample H (mm), formula (3): H = (m2−m1)/(ρ·A) × 10 Where: m1— mass of the specimen, g; m2— mass of the specimen after coating with the test sample, g; ρ— density of the test sample (unless otherwise specified, the density of rust-preventive grease may be calculated as 0.9/cm³), g/cm³; A— total area of the specimen, cm². (The source formula (3) is typeset as “H=A m m ⋅ − ρ 1 2 ×10”, requires confirmation against the source standard (source-text extraction))

10. Precision

not provided in the available source.

11. Report

not provided in the available source.

12. Normative references

• GB/T 711 (steel No. 10, steel No. 45)
• GB/T 718 (grade one cast iron Z30)
• GB/T 5231 (brass H62, copper T3)
• GB/T 470 (zinc Zn-3 or Zn-4)
• GB/T 3190 (aluminum LY12)
• YS 72 (cadmium Cd3)
• GB/T 469 (lead Pb-2 or Pb-3)
• GB/T 13377 (A method 7.2.1.8 determination of the density of the test sample at 23℃±3℃)
• Magnesium ZM5 corresponding standard number: not provided in the available source
• Figure 1, Figure 2, Figure 3, Figure 4: graphic content not provided in the available source

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