SH/T 0300-1992 Crankshaft Box Simulation Test Method (QZX method)

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Card type: Test method

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

• Standard number: SH/T 0300-92
• Chinese full name: Crankshaft Box Simulation Test Method (QZX method)
• English name: not provided in the available source
• Replacement relationship: replaces SY 2684-82
• Approval/implementation: approved by China Petrochemical Corporation 1992-05-20, implemented on 1992-05-20

2. Scope of application and non-applicability

• Applicable for evaluating the thermal oxidation stability of additives and additive-containing internal combustion engine oils.
• It is a simulation test method used in scientific research to screen detergents, antioxidant and anti-corrosion agents, and composite oil formulations.
• Non-applicable scope: not provided in the available source.

3. Method principle

Make additive-containing internal combustion engine oil splash onto a high-temperature metal surface to form a lacquer film, thereby simulating the lacquer formation of crankcase oil during piston operation; and use the method of hanging lead sheets in the test oil tank to simulate the corrosion of crankcase oil on engine components under gas-liquid phase oxidation conditions. By measuring the lacquer film rating and gum weight on the metal plate, investigate the thermal oxidation stability of the oil. After running 250mL test oil under specified conditions in the simulation testing machine for 6h, investigate the lacquer film formation and gum formation.

4. Reagents and materials (purity / preparation)

• 4.2.1 Aluminum plate: 90mm × 40mm × 8mm, effective lacquer-forming area is 2400mm² (80mm × 30mm). (Original written as "2400mm (80mm 30mm)", units and multiplication sign require confirmation against the source standard (source-text extraction))
• 4.2.2 Lead sheet: Pb-2, meets the requirements of GB 1470, diameter 24.5mm, thickness 1mm, center hole diameter 4.5mm.
• 4.2.3 Sandpaper: 0 grit.
• 4.2.4 Washing gasoline: meets the requirements of GB 1922 grade 90 or SH 0114.
• 4.3.1 Petroleum ether: 60～90℃ (original written as "60～90C"), analytical grade.
• 4.3.2 Hydrochloric acid: specific gravity 1.19, analytical grade, prepare 13% (m/m) hydrochloric acid solution.

5. Instruments and equipment

• 4.1.1 Crankshaft box simulation test instrument: see Appendix A.
• 4.1.2 Analytical balance: weighing capacity 200g, sensitivity 0.0001g.
• 4.1.3 Desiccator.
• 4.1.4 Measuring cup: 250mL (original written as "250ml.").
• 4.1.5 Wash bottle.
• Appendix A Instrument composition:
  • A1 Consists of a simulator and a temperature controller.
  • A2 The simulator includes main components such as an oil tank, oil splashing rod, heating plate, and electric motor.
  • Oil splashing rod: on an aluminum alloy rod (φ8mm, original written as "¢8mi", requires confirmation against the source standard (source-text extraction)), equipped with three rows of 8 rows of stainless steel wire (φ0.3mm), each row spacing 8mm, each row angle 120° (original written as "120C").
  • Heating plate: plate temperature heating wire 600W, thermocouple EA-2; oil temperature heating to be used 450W, thermocouple EA-2.
  • A3 Temperature controller: any instrument capable of controlling within the ±2℃ range specified by this method, XCT-191 type moving-coil indicating regulator 0～300℃ and 0～600℃ one each.

6. Recommended operating conditions

• Test oil amount: 250mL.
• Running time: 6h.
• Oil temperature: first heat the oil, when the oil temperature reaches 100±5℃, then heat the plate temperature; the oil temperature should reach 150±2℃ within half an hour.
• Plate temperature: start timing when the test temperature is reached (310℃ or 320℃ or 330℃).
• Temperature control: strictly control the test temperature within the ±2℃ range (original written as "within 2C range"), record the temperature once every 30min.
• Instrument calibration: use reference oil (see Appendix B) to calibrate the test instrument at 310℃ or 320℃ plate temperature; the calibration results should meet the specified ranges of the reference oil's nominal rating and gum weight.

7. Sampling and sample preparation

• 6.1.1 Aluminum plate: place the sandpaper on a flat surface, grind the working surface of the aluminum plate longitudinally until bright. Use absorbent cotton to wipe the test plate clean in petroleum ether. Take it out, place it on filter paper to air dry, then place it in a desiccator for later use (check the small hole for inserting the thermocouple for solvent and impurities).
• 6.1.2 Lead sheet: select two lead sheets with no surface defects and uniform thickness, place them in 13% (m/m) hydrochloric acid solution for treatment for 15～20min, then take them out, rinse with tap water until neutral, blot dry with filter paper, and polish with chamois leather (polishing includes the inner hole and edges of the lead sheet), engrave numbers, then clean with absorbent cotton in petroleum ether. Place on filter paper to air dry, then place in a desiccator for later use.
• 6.2 Cleaning of instruments: before use, the oil tank should be cleaned with washing gasoline and blown dry.
• 6.4 Must carefully check the circuit system for leakage, open circuit, and short circuit phenomena. All grounding should be good.
• 6.5 Check the two fan blades on the oil splasher, they should be directed toward the motor to cool it.

8. Analysis steps

• 7.1 Weigh the clean and dried aluminum plate and lead sheet accurately to 0.0005g, record the values.
• 7.2 Instrument installation:
  • 7.2.1 Close the oil drain cock, take 250mL of test oil, inject into the oil tank.
  • 7.2.2 Use a glass hook to hang the lead sheet so that the lead sheet is immersed in the oil by 2/3.
  • 7.2.3 Place the gasket on the oil tank plate frame, place the aluminum plate, cover the heating plate, tighten the screw rod, insert the thermocouple, and ensure that the thermocouple tip is in close contact with the top of the aluminum plate hole.
  • Note: Two 0.5mm gaskets can be placed on the oil tank plate frame, generally avoiding oil leakage.
• 7.3 Start the motor, first heat the oil, when the oil temperature reaches 100±5℃, then heat the plate temperature. The oil temperature should reach 150±2℃ within half an hour, and the plate temperature reaches the test temperature (310℃ or 320℃ or 330℃) to start timing.
• 7.4 Strictly control the test temperature within the ±2℃ range, and record the temperature once every 30min.
• 7.5 After the test has proceeded for 6h (original written as "sh", requires confirmation against the source standard (source-text extraction)), immediately stop the automatic control system and motor, and cut off the main power supply.
• 7.6 Disassemble the simulator in reverse installation order, use tweezers with absorbent cotton on the tip to carefully take out the aluminum plate and lead sheet; the test plate and test piece must be allowed to cool naturally to room temperature. Use a wash bottle filled with petroleum ether to gently rinse the aluminum plate from top to bottom until the petroleum ether is colorless. Use tweezers with absorbent cotton on the tip to clamp the lead sheet and wipe it with absorbent cotton in petroleum ether to remove oil stains and deposits on the lead sheet. Place both the aluminum plate and lead sheet on filter paper to air dry, place in a desiccator for 30min, then weigh, accurate to 0.0005g, record the values (check the small hole for inserting the thermocouple in the aluminum plate for solvent and impurities).
• 7.7 After the oil tank cools, wash it clean with washing gasoline.

9. Qualitative and quantitative and calculation formulas

• 8.1 Rating: rate by reference to the standard color plate, rating to 0.5 grade.
• 8.2 Gum weight: the increase in weight of the aluminum plate is the gum weight, expressed as mg.
• 8.3 When reporting test results, indicate the plate temperature.
• Standard color plate (5.1): divided into grades 1～10, used to indicate the different degrees of lacquer film and carbon deposit covering the aluminum plate surface. If the lacquer film formed on the aluminum plate surface does not exactly match any standard color plate, but is between two adjacent standard color plates, rate to 0.5 grade.
• 5.1.1 Lacquer film judgment (rating | text description):
  • 1 | Test plate natural color or bright colored pattern
  • 2 | Light yellow lacquer film
  • 4 | Light brown partially with yellow
  • 5 | Light brown or with slight brown
  • (In the original table, "mostly brown with slight dark brown" is not marked with a corresponding rating number, requires confirmation against the source standard (source-text extraction))
  • 6 | Brown with part dark brown
  • 7 | Dark brown partially brown
  • 8 | Mostly brown with slight black
  • 9 | Mostly black partially dark brown
  • 10 | Black, bright black or carbon black
• 5.1.2 Carbon deposit grade addition: for every increase of one-fifth in the carbon deposit area on the test plate, add one grade; if less than one-fifth, add half a grade.
• Corrosion: refers to the weight loss of the lead sheet, expressed in milligrams (see note in Section 9).

10. Precision

• 9.1 Repeatability of rating: for the same test oil, the difference between the results of two repeated determinations by the same operator on the same instrument shall not exceed 0.5 grade.
• 9.2 Repeatability of gum weight: for the same test oil, the difference between the results of two repeated determinations by the same operator on the same instrument and their arithmetic mean shall not exceed the following values:
  • Gum weight less than or equal to 10mg, not greater than 1.5mg.
  • Gum weight greater than 10～30mg, not greater than 3mg.
  • Gum weight greater than 30mg, not greater than 5mg.
• Note: Corrosion refers to the weight loss of the lead sheet, expressed in milligrams. Reliable data on the repeatability of corrosion have not yet been obtained. According to existing data, the following corrosion test repeatability values can only be used as reference. The difference between the results of two repeated determinations and their arithmetic mean shall not exceed the following values:
  • Less than or equal to 10mg, not greater than 2mg.
  • Greater than 10～25mg, not greater than 3mg.
  • Greater than 25～100mg, not greater than 8mg.
  • Greater than 100mg, not greater than 15mg.

11. Report

• 8.1 Rating: rate by reference to the standard color plate, rating to 0.5 grade.
• 8.2 Gum weight: the increase in weight of the aluminum plate is the gum weight, expressed as mg.
• 8.3 When reporting test results, indicate the plate temperature.

12. Referenced documents

• GB 1470 Lead and lead-antimony alloy plates
• GB 1922 Solvent naphtha
• SH 0114 Aviation washing gasoline
• Appendix A Crankshaft box simulation test instrument (supplementary document)
• Appendix B Reference oil for instrument calibration (supplementary document)
  • B1 Reference oil composition: 11 base oil + 3%T108+0.5%T202
  • B2 Nominal values of rating and gum weight of reference oil: the average of test results from units designated by the standard management organization, provided with the oil by the unit preparing the reference oil.

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 for questions and answers