SH/T 0633-1996 Rust corrosion test method for water-cooled two-stroke gasoline engine oils

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 0633-1996
• Chinese title: Rust corrosion test method for water-cooled two-stroke gasoline engine oils
• English title: not provided in the available source
• Replacement relationship: not provided in the available source (the foreword only states equivalent adoption of NMMA "TC-WII Rust test method", and does not mention any replaced standard)
• Adoption status: equivalent adoption of the United States Marine Manufacturers Association (NMMA) "TC-WII Rust test method"

2. Applicable scope and non-applicability

• Applicable scope: This standard specifies the method for determining the ability of two-stroke gasoline engine oils to prevent rusting of engine intake reeds; it is applicable to water-cooled two-stroke gasoline engine oils.
• Not applicable: not provided in the available source.

3. Method principle

The treated reeds are respectively immersed in the test sample and the reference oil for 1 min, drained, and suspended in a container holding aqueous sodium chloride solution. By observing and comparing the rust condition of the reeds, it is determined whether the test sample can pass the rust test.

4. Reagents and materials (purity / preparation)

• 4.1 Petroleum ether: boiling range (60～120) ℃, analytical reagent.
• 4.2 Sodium chloride: chemical reagent.
• 4.3 Anhydrous ethanol: chemical reagent.
• Materials:
  • 3.2.1 Reed: manufactured by Mercury Marine of the United States (Mercury Marine), number 34-31942AI (original text is "34-31942AIa", requires confirmation against the source standard (source-text extraction)).
  • 3.2.2 Stainless steel wire: diameter 1 mm (original text "lmma", requires confirmation against the source standard (source-text extraction)).
  • 3.2.3 Transparent coordinate paper: resolution 1 mm (original text "Immo", requires confirmation against the source standard (source-text extraction)).
  • 3.2.4 Reference oil: United States CPMO 937380 (original text "CPMO 937380", requires confirmation against the source standard (source-text extraction)).
  • 3.2.5 Distilled water.
• Solution preparation (5.1): Dissolve 227 g sodium chloride in 3785 mL distilled water to prepare the sodium chloride solution.

5. Apparatus and equipment

• 3.1.1 Container: colorless transparent glass product, 5000 mL (original text "5000mLo", requires confirmation against the source standard (source-text extraction)).
• 3.1.2 Tweezers: stainless steel or non-metallic product.
• 3.1.3 Thermometer: 0～50 ℃, scale division 1 ℃.
• 3.1.4 Beaker: 50 mL.
• 3.1.5 Fluorescent desk lamp: two 15 W fluorescent tubes.
• 3.1.6 Electric furnace: enclosed resistance wire type, 300 W.

6. Recommended operating conditions

• The sodium chloride solution container is placed in a dark place at a temperature of 24 ℃±3 ℃ (original text "2490 t 3℃", requires confirmation against the source standard (source-text extraction)), with two 15 W fluorescent lamps installed above the container.
• The test sample and reference oil are placed in a dark place at 24 ℃±3 ℃ (original text "249u t 3℃", requires confirmation against the source standard (source-text extraction)); the liquid levels in each beaker should be the same and the reeds must be able to be completely immersed.
• The distance between the reeds and the fluorescent tube above the liquid level in the container is about 300 mm.
• Turn on the fluorescent lamp during observation, and observe once every 30 min.

7. Sampling and test sample preparation

• Pour the test sample and reference oil respectively into 50 mL beakers with labels attached (5.2).
• Reed cleaning treatment (6.1, 6.2): Soak the reed hung with stainless steel wire in boiling petroleum ether and clean thoroughly to remove all rust-preventive grease; then rinse in boiling anhydrous ethanol solution and drain.
• Note: During cleaning, the reed must not be touched by hand; it must be picked up with tweezers. Cleaning should be carried out in a fume hood and attention should be paid to safety.

8. Analysis procedure

• 6.3 Immerse the treated reeds respectively in the beakers containing the reference oil and the test sample for 1 min, take them out and drain for 1 min, then suspend them in the prepared sodium chloride solution. The reeds should be completely immersed in the solution, and the distance between the reeds and the fluorescent tube above the liquid level in the container is about 300 mm.
• 6.4 Observe the reeds once every 30 min, turning on the fluorescent lamp during observation. Stop the test after the first rust spot with a diameter exceeding 1 mm appears on the reference oil reed; or after the first rust spot with a diameter exceeding 1 mm has appeared on all other test sample reeds except the reference oil reed.
• 6.5 Take the reeds out of the sodium chloride solution and compare them on a flat white surface at a distance of 300 mm below the fluorescent tube (2×15 W), and calculate the corrosion area of each reed (original text "300. below", requires confirmation against the source standard (source-text extraction)).

9. Qualitative and quantitative determination and calculation formula

The percentage of reed rust area is calculated according to formula (1):

X₁ = (total rust area of the reed in the test sample or reference oil / 1138) × 100 …… (1)

• Where: X₁ — total rust area of the reed in the test sample (or reference oil), mm²;
• 1138—— total area of both sides of the reed, mm².
• Note: The total rust area of the reed is obtained by adding the rust areas of both sides of the reed; the rust area of each side is measured by covering with transparent coordinate paper.

10. Precision

not provided in the available source.

11. Report

not provided in the available source (the evaluation criterion is given in Chapter 8: if the rust area percentage of the test sample reed is less than the rust area percentage of the reference oil reed, the test sample passes).

12. Referenced documents

not provided in the available source (the main text does not list a normative reference document list).

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 Q&A