SH/T 0087-1991 Test method for cavitation corrosion characteristics of aluminum pumps with engine coolants

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

• Standard number: SH/T 0087-91 (confirmed in 2000)
• Chinese name: Test method for cavitation corrosion characteristics of aluminum pumps with engine coolants
• English name: not provided in the available source
• Replacement relationship: not provided in the available source
• Reference adoption: ASTM D2809-89 "Test method for cavitation corrosion characteristics of aluminum pumps with engine coolants"
• Approval/implementation: approved by China Petrochemical Corporation in 1991-11-26, implemented in 1992-12-01

2. Scope of application and non-applicability

• Scope of application: This standard specifies the method for determining the cavitation corrosion characteristics of a sample on an aluminum pump; it is applicable to engine coolants and concentrated engine coolants.
• Not applicable: not provided in the available source.

3. Method principle

Using a standard aluminum automotive water pump, pump the sample so that under the conditions of 113℃, 103kPa, and a pump speed of 4600r/min, it operates for 100h, then inspect the water pump to determine the degree of cavitation corrosion, and rate it according to the grading system table.

4. Reagents and materials (purity / preparation)

4.1 Materials

• 4.2.1 Automotive cooling system cleaner
• 4.2.2 Phosphoric acid: content 85%, industrial grade
• 4.2.3 Chromium trioxide: industrial grade
• 4.2.4 Sodium carbonate: industrial grade (the source text source-text extraction is "industrial\ 0 grade", requires confirmation against the source standard (source-text extraction))

4.2 Reagents

• Anhydrous sodium sulfate: chemically pure
• Sodium chloride: chemically pure
• Sodium bicarbonate: chemically pure
• Calcium chloride: chemically pure

4.3 Solution preparation

• Corrosive water preparation: dissolve 148mg anhydrous sodium sulfate, 165mg sodium chloride, and 138.g sodium bicarbonate in 1L distilled water or deionized water (the source text is "138.g", requires confirmation against the source standard (source-text extraction)).
• Sample preparation: 1 volume of concentrated coolant plus 5 volume of corrosive water; the corrosive water contains sulfate ions, chloride ions, and bicarbonate ions at 100ppm each, added in the form of anhydrous sodium salts.
• Cleaning solution: each liter of water contains 35mL phosphoric acid and 20g chromium trioxide.
• Sodium carbonate solution: 8208 sodium carbonate (the source text is "8208", requires confirmation against the source standard (source-text extraction)) and 17L tap water.
• 5% Calcium chloride aqueous solution: made from the water of step 6.3.10.

5. Instruments and equipment

• 4.1.1 Test apparatus: The cavitation corrosion test apparatus is shown in the figure below (the source text includes an apparatus diagram). It is installed on a bench suitable for assembly, adjustment, and fixation. The entire apparatus must have safety protection measures to prevent scalding caused by rupture of the water pump, rubber hoses, and pipelines; all drive belts and pulleys must have guards.
• 4.1.2 Test pump: standard aluminum automotive water pump Buick (Buick) pump and engine front cover. Note: Generally, the test pump for this standard is the Buick pump GM 25527536 and engine front cover GM 25515465 produced by General Motors Corporation of the United States.
• 4.1.3 Thermometer: see SH/T 0066 Appendix A.
• Apparatus diagram components: 1— motor; 2— water pump; 3— vacuum pressure gauge; 4— throttle valve; 5— heater; 6— liquid storage tank; 7— fan; 8, 12, 13— regulating valves; 9— pressure gauge; 10— thermometer; 11— expansion tank.

6. Recommended operating conditions

• Pump speed: about 2675r/min during cleaning; during testing (4600±100) r/min.
• Coolant temperature: initially 35～38℃ for the test; after heating (113±1) ℃.
• System pressure: (103±3) kPa.
• Pump inlet vacuum degree: 6.8kPa.
• Operating time: 100h.
• Total system volume: about 17.5L.
• Cleaning temperature: raise to 63℃ (the source text is "6390", requires confirmation against the source standard (source-text extraction)); if it exceeds 68℃, cool with a fan.

7. Sampling and sample preparation

• 6.1 Sampling: sample according to the method of SH/T 0065.
• 6.2 Sample preparation: prepare from 1 volume of concentrated coolant plus 5 volume of corrosive water. The corrosive water contains sulfate ions, chloride ions, and bicarbonate ions at 100ppm each, added in the form of anhydrous sodium salts. When testing engine coolant, it should also be converted to 1 volume of concentrated coolant and 5 volume of corrosive water to prepare the sample.

8. Analytical procedure

8.1 Test apparatus cleaning

• 6.3.1 Replace all rubber hoses (hoses can only be used once). Adjust throttle valve 4 to the fully open position, install a standard pump as the cleaning pump (reusable), with a pump speed of about 2675r/min.
• 6.3.2 According to the automotive cooling system cleaner instructions, prepare a 17L solution with tap water, fill the system (total system volume about 17.5L), start the water pump and circulate for the specified time, then drain this solution.
• 6.3.3 Fill with tap water, start the water pump, circulate for 5min, drain the water. Repeat this operation three times.
• 6.3.4 Fill the system with a cleaning solution containing 35mL phosphoric acid and 20g chromium trioxide per liter of water. Note: Chromium trioxide is a strong oxidant; avoid contact with skin, eyes, and clothing, and do not inhale its powder; phosphoric acid is a strong acid; avoid contact with skin.
• 6.3.5 Start the water pump, use the heater to raise the system temperature to 63℃ (the source text is "6390", requires confirmation against the source standard (source-text extraction)); after reaching this temperature, turn off the heater. Circulate the cleaning solution for 1h; if the temperature exceeds 68℃, cool with a fan, and drain this solution after circulation.
• 6.3.6 Repeat step 6.3.3.
• 6.3.7 Inject a solution composed of 8208 sodium carbonate (requires confirmation against the source standard (source-text extraction)) and 17L tap water, circulate for 10min. Drain this solution after circulation.
• 6.3.8 Inject tap water, circulate for 3min, then drain the water.
• 6.3.9 Repeat step 6.3.8 three times.
• 6.3.10 Fill with distilled water, circulate for 3min. Take a sample for 1L, then drain the water.
• 6.3.11 Take the water from step 6.3.10 and make it into a 5% calcium chloride aqueous solution. Compare with a 5% calcium chloride aqueous solution prepared with distilled water; if the degree of turbidity is different, continue cleaning with distilled water until the two are consistent.

8.2 Test procedure

• 7.1 Remove the cleaning pump from the test bench and install a new standard pump. When installing the standard pump, sealant must not be used.
• 7.2 Shake the sample well, add about 14L of sample to the main system through the expansion tank, and at the same time start the water pump so that the sucked-in air is discharged from the filling port. Then add 2L of sample to the expansion tank.
• 7.3 Start the test and adjust the following conditions:
  • 7.3.1 Pump speed is (4600±100) r/min.
  • 7.3.2 Coolant temperature is 35～38℃.
  • 7.3.3 Adjust valves 4, 8, 13 so that the system pressure is (103±3) kPa and a vacuum degree of 6.8kPa is generated at the pump inlet.
• 7.4 After reaching the conditions of clause 7.3, raise the system temperature to (113±1) ℃, adjust valves 8, 12, maintain the system pressure at (103±3) kPa, and the positions of valves 4, 13 must not be changed.
• 7.5 Operate the water pump for 100h. Note: ① The water pump may be stopped at night, but the system must be ensured not to leak. ② During the entire test period, the compensation solution added must not exceed 1L.
• 7.6 Disassemble the water pump, clean the water pump and engine front cover with clean water. Dry the components and observe with the naked eye.

9. Qualitative and quantitative determination and calculation formula

The test results are expressed according to the grades described in the grading system table, and the degree of cavitation corrosion is evaluated by grade number.

Note: ① If the corrosion is between two grades, the rating will take the higher grade number of the two grades. ② Grade 1—3 depends on the thickness of the casing wall; when the same water pump is used for the test, grade 1—3 can be used as a relative grade.

10. Precision

not provided in the available source.

11. Report

The test results are expressed according to the grades described in the grading system table. The degree of cavitation corrosion is evaluated by grade number.

12. Referenced documents

• SH/T 0065 Sampling of test samples of engine coolant or rust inhibitor and preparation of their aqueous solutions
• SH/T 0066 Determination of foaming tendency of engine coolants (glassware method)
• ASTM D2809-89 Test method for cavitation corrosion characteristics of aluminum pumps with engine coolants (reference adoption)

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