SH/T 0195-1992 Lubricating oil corrosion test method

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 0195—92 (confirmed in 2000)
• Chinese title: Lubricating oil corrosion test method
• English title: not provided in the available source
• Replacement relationship: replaces ZB E34 013-88
• First issued: 1959
• Reference adoption: Soviet national standard ГОСТ 2917—45 "Lubricating oil corrosion test method"
• Approval/implementation: approved by China Petrochemical Corporation 1992-05-20, implemented on 1992-05-20

2. Scope of application and non-applicability

• This standard specifies the method for testing the corrosiveness of lubricating oil on metal sheets.
• This standard applies to lubricating oils.
• Unless otherwise specified, the metal sheet material is copper or steel.
• Non-applicable scope: not provided in the available source.

3. Method principle

A polished metal sheet with a fresh metal surface exposed is immersed in lubricating oil; after exposure at the specified temperature for a certain period, the color change that occurs is used to determine the corrosiveness of the lubricating oil on the metal.

4. Reagents and materials (purity / preparation)

4.1 Reagents

• Anhydrous ethanol: analytical grade.
• Benzene: analytical grade.
• Ethanol-benzene mixed liquid: prepared from anhydrous ethanol and benzene in a volume ratio of 1:4.

4.2 Materials

• Metal sheet: material is copper No. 3 (T3), steel No. 40–50, or metal specified in other product standards. The shape is circular (diameter 38–40mm, thickness 3mm±1mm) or square (side length 48~50mm, thickness 3mm±1mm). Each metal sheet has one hole of diameter 5mm: for a circular metal sheet, the center of the hole is located at a distance of 5mm from the edge; for a square metal sheet, the center of the hole is located at a corner at a distance of 5mm from the edge.
• Emery cloth (or emery paper): grit numbers 150 and 180.
• Absorbent cotton.

5. Apparatus and equipment

• Beaker or porcelain cup: diameter not less than 85mm, height not less than 100mm.
• Glass rod: about 20–30mm longer than the diameter of the beaker or porcelain cup, with two concave notches spaced 20–30mm apart on it, for hanging small glass hooks.
• L-shaped small glass hook: about 30mm long, used for hanging the metal sheet.
• Magnifying glass: capable of magnifying 6~8 times.
• Porcelain evaporating dish or culture dish.
• Steel needle or electric engraving instrument.
• Tweezers.
• Oven: capable of maintaining 100℃±2℃ (inferred from clause 6.2).

6. Recommended operating conditions

• Heating sample temperature: 105℃ (6.1).
• Oven temperature: 100℃±2℃ (6.2).
• Holding time: 3h (6.2).

7. Sampling and sample preparation

7.1 Metal sheet grinding (5.1)

The entire surface of the metal sheet is carefully ground in longitudinal strokes with emery cloth, and finally ground with emery cloth No. 180 until smooth and bright with no obvious processing marks. The number of each metal sheet may only be engraved on the side edge.

7.2 Metal sheet cleaning (5.2)

The ground metal sheet is held with tweezers in a porcelain evaporating dish or culture dish, washed with benzene, then wiped with absorbent cotton soaked in benzene, and finally dried with dry cotton; it must not come into contact with hands.

7.3 Metal sheet inspection (5.3)

The washed and dried metal sheet is observed with a magnifying glass; there must be no corrosion spots or other marks on the sheet. For small pits and small spots on the metal sheet, a steel needle or electric engraving instrument is used to scratch a circle with a diameter not exceeding 1mm. If there are still stains on the metal sheet, it is washed and dried again; if corrosion marks still exist, the metal sheet shall be discarded.

7.4 Sample

No separate sampling clause is provided in the available source.

8. Analysis procedure

• 6.1 Pour the sample into a clean and dry beaker until it is 15~20mm from the mouth of the beaker, and heat it to 105℃. Then take two prepared metal sheets of the same grade and hang them on small glass hooks, then hang them at the notches of the glass rod at the center of the beaker mouth, and immerse the metal sheets in the heated sample. When placing the glass rod, take care not to let the metal sheets contact each other, and also not to let them contact the edge of the beaker.
• 6.2 Place the beaker containing the sample and metal sheets in an oven at 100℃±2℃ and maintain for 3h.
• 6.3 When exactly 3h is reached, remove the metal sheets from the sample and immerse them in a porcelain evaporating dish containing ethanol-benzene mixed liquid, wash carefully, then rinse several times with ethanol-benzene mixed liquid. The washed metal sheets should be immediately dried with cotton and carefully observed. For washed brass or pure copper sheets, first check for green color, then gently wipe with cotton, and then carefully observe.

9. Qualitative and quantitative determination and calculation formula

9.1 Judgment (7.1)

Except for the places circled and scratched by the steel needle or electric engraving instrument and the places within 1mm from the hole and edge, if no copper green, spots, or small dots are observed on the metal sheet with the naked eye, the sample is considered qualified. When testing copper and copper alloys, there should be no green, dark brown, or copper-gray spots or films, but slight discoloration of the metal sheet is allowed.

9.2 Retest judgment (7.2)

If corrosion marks are found on only one metal sheet, the test shall be repeated; in the second test, even if the above corrosion situation appears again on one metal sheet, the sample is still considered unqualified.

9.3 Calculation formula

not provided in the available source.

10. Precision

not provided in the available source.

11. Report

not provided in the available source.

12. Referenced documents

• Soviet national standard ГОСТ 2917—45 "Lubricating oil corrosion test method" (reference adoption)
• Other referenced documents: 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 Q&A