SH/T 0080-1991 Corrosiveness test method 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 title / English name / replacement relationship

• Standard number: SH/T 0080-91
• Chinese title: Corrosiveness test method for rust-preventive oils and greases
• English title: not provided in the available source
• Replacement relationship: replaces SY 2752-82
• Confirmation information: the source marks "(2,,! year confirmation)", the specific year requires confirmation against the source standard (source-text extraction)
• Drafting unit: responsible drafting by the Research Institute of Maoming Petroleum Industry Company; proposed by Maoming Petroleum Industry Company; technical centralized management by the Research Institute of Petroleum Processing
• Main drafter: Bai Siming
• Reference adoption: the corrosiveness test method of clause 5.28 in Japanese Industrial Standard JIS K 2246-89 "Rust-preventive oil"
• Approval/implementation: approved by China Petrochemical Corporation 1991-11-26, implemented on 1992-12-01

2. Scope of application and non-application

• This standard specifies the test method for the corrosiveness of rust-preventive oils and greases to metals.
• This standard applies to rust-preventive oils and greases.
• Not applicable: not provided in the available source.

3. Method principle

After combining multiple metal test pieces required by the product specification, immerse them in the sample; for rust-preventive oil, maintain at 55℃±2℃ for 7d; for rust-preventive grease, maintain at 80℃±2℃ for 14d; evaluate the corrosiveness of the sample to metals based on the mass change and color change of the test pieces.

4. Reagents and materials (purity / preparation)

4.1 Reagents

• Anhydrous ethanol: chemically pure.

4.2 Materials

• Test pieces: the material specifications of some test pieces are shown in the table below. The types of test pieces for each test shall be selected according to the product specification requirements.

Test piece material specification table:

• Metallographic abrasive paper: No. 400 corundum metallographic abrasive paper.
• Water-resistant abrasive paper: No. 500 corundum water-resistant abrasive paper.
• Filter paper: qualitative filter paper.
• Medical gauze or degreased cotton.
• Solvent naphtha for rubber industry: conforms to the provisions of SH 0004.

5. Instruments and equipment

• Constant temperature device: an electric thermostatic water bath or electric thermostatic drying oven capable of maintaining the sample temperature at 55℃±2℃ and 80℃±2℃.
• Analytical balance: sensitivity 0.1 mg.
• Vernier caliper: graduation value 0.05 mm.
• Wide-mouth closed glass container: diameter 75～90 mm, capacity 300 mL or more.
• Reflux condensation device.
• Test piece assembly: as shown in the figure, composed of the following parts, made of polytetrafluoroethylene resin material.
  • Cylindrical head screw: M6 mm×1.0 mm×60 mm.
  • Washer: φ12 mm×φ6.5 mm×4.5 mm (source-text extraction writes "[unreadable character]2mm×06.5mm×4.5mm", requires confirmation against the source standard).
  • Nut: M6 mm×1.0 mm.
• Desiccator.
• Hot and cold dual-purpose hair dryer.

Test piece assembly illustration (solvent-diluted rust-preventive oil): 1— test pieces (from right to left in order: chromium, tin, magnesium, aluminum, zinc, brass, steel); 2— washer; 3— cylindrical head screw; 4— nut.

6. Recommended operating conditions

• Rust-preventive oil: 55℃±2℃, place for 7d.
• Solvent-diluted rust-preventive oil: should be carried out in a water bath, and the wide-mouth bottle must be equipped with a reflux condensation device.
• Rust-preventive grease: preheat the sample to 80℃±2℃ before injecting into the wide-mouth closed glass container, cover the lid and place in the 80℃±2℃ constant temperature device, place for 14d.
• The combined test pieces must be completely immersed in the sample.

7. Sampling and sample preparation

7.1 Test piece treatment

• Steel, copper and brass pieces: use No. 400 metallographic abrasive paper according to SH/T 0218 to grind and clean the test pieces, then place in a desiccator to cool.
• Zinc, aluminum, lead, magnesium and tin pieces: under running water, use No. 500 water-resistant abrasive paper to grind the test pieces bright along the long side, immediately immerse sequentially in anhydrous ethanol, solvent naphtha for rubber industry, boiling anhydrous ethanol to clean, then place in a desiccator to cool.
• Chromium piece: wash with solvent naphtha for rubber industry, then clean with anhydrous ethanol, place in a desiccator.

7.2 Weighing and combination

• After the test pieces cool in the desiccator for 30 min, weigh on an analytical balance, accurate to 0.1 mg, record mass M1.
• After weighing, handle the test pieces with clean filter paper, in the order of steel, copper, brass, zinc, aluminum, lead, magnesium, tin, chromium as shown in the figure above, use the test piece assembly to combine the test pieces into three groups.

8. Analysis steps

• Place the combined test pieces respectively into three wide-mouth closed glass containers (the test pieces are vertical).
• Rust-preventive oil: inject 300 mL sample into the wide-mouth closed glass container, cover the lid and place in the 55℃±2℃ constant temperature device, place for 7d. Solvent-diluted rust-preventive oil should be carried out in a water bath, and the wide-mouth bottle must be equipped with a reflux condensation device.
• Rust-preventive grease: preheat the sample to 80℃±2℃ before injecting into the wide-mouth closed glass container, cover the lid and place in the 80℃±2℃ constant temperature device, place for 14d. The combined test pieces must be completely immersed in the sample.
• After reaching the specified test time, take out and separate the test piece assembly, use gauze dipped in solvent naphtha for rubber industry to wipe off the sample and loose corrosion products on the surface and in the holes of the test pieces, then clean in solvent naphtha for rubber industry and boiling anhydrous ethanol, place in a desiccator to cool for 30 min then weigh, accurate to 0.1 mg, record mass M2.
• Observe with the naked eye and record the color change on the surface of the test pieces, whether there are marks, dirt and other abnormal conditions.
• Use a vernier caliper to measure and calculate the surface area A of the test piece minus the part in contact with the assembly.

9. Qualitative and quantitative and calculation formula

The corrosion mass change of the test piece C (mg/cm²) is calculated according to the following formula:

C = (m2 − m1) / A

Where:

• m1—— mass of test piece before test, mg;
• m2—— mass of test piece after test, mg;
• A—— surface area of test piece minus the part in contact with the assembly, cm².

(The original formula source-text extraction has noise, the symbols are subject to the context, requires confirmation against the source standard (source-text extraction).)

10. Precision

not provided in the available source.

11. Report

• Mass change: take the arithmetic mean of the mass changes of three test pieces, rounded to two decimal places.
• Color change (compared with newly polished test pieces), expressed according to the following grades:
  • Grade 0——bright as before;
  • Grade 1——uniform slight discoloration;
  • Grade 2——obvious discoloration;
  • Grade 3——severe discoloration or obvious corrosion.
• For the three test pieces, take the two with the same color change for grading; if all are different, redo the test.

12. Referenced documents

• GB/T 711 Hot-rolled thick steel plates and wide steel strips of high-quality carbon structural steel
• GB/T 1470 Lead and lead-antimony alloy plates
• GB/T 2055 Tin anode plates (source-text extraction writes "[garbled anode-plate name]", requires confirmation against the source standard)
• GB/T 2058 Zinc anode plates
• GB/T 3190 Chemical composition of wrought aluminum and aluminum alloys
• GB/T 5153 Designations and chemical composition of wrought magnesium and magnesium alloys
• GB 5231 Wrought copper chemical composition and product shapes
• GB 5232 Wrought brass chemical composition and product shapes
• GB/T 9797 Metallic coatings Nickel+chromium and copper+nickel+chromium electrodeposited coatings
• SH 0004 Solvent naphtha for rubber industry
• SH/T 0218 Preparation method of test pieces for rust-preventive oil and grease tests

Editor's note (original text): The standard numbers and standard names of the referenced standards in this standard have changed as follows:

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