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GB/T 38498-2020Evaluation method for determining metal corrosion of disinfectant (English PDF)

消毒剂金属腐蚀性评价方法

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

March 6, 2020

Implementation date

October 1, 2020

Scope

GB/T 38498-2020 is the English-translated version of 消毒剂金属腐蚀性评价方法.

GB/T 38498-2020 sets out the method for evaluating the corrosion that disinfectants and disinfection equipment cause to metals, covering disinfection by aerosol spraying, ultrasonic atomisation, vaporisation, gas, constant spraying, wiping, immersion and washing.

Clause 1 applies it to the evaluation of metal corrosion by disinfectants that come into contact with metal and alloy materials during disinfection and by disinfection instruments that work through chemical agents.

Its contents list names clause 4 on the evaluation principle, clause 5 on test methods and clause 6 on the calculation and reporting of the metal corrosion rate; Table 2 grades the result from basically no corrosion below 0.0100 mm per year, through mild and moderate corrosion, to severe corrosion at 1.0000 mm per year and above.

Clause 5 specifies the test pieces as round discs 24.00 mm in diameter and 1.0 mm thick with a 2.0 mm hole and a total surface area of about 9.80 cm2, made of carbon steel, copper, aluminium, stainless steel or zinc to GB/T 700, GB/T 1176, GB/T 1173, GB/T 1220 and GB/T 1175 respectively, polished, uniform in size and usable only once, the oxide layer being removed with 120 grit water sandpaper to GB/T 2481.1 and each sheet of paper grinding only one piece.

It also gives the acid and salt solutions and soaking times for stripping corrosion products from each metal, then an hour of drying at 50 degrees Celsius, storage in a desiccator, measurement of diameter, thickness and hole with a vernier caliper to 0.1 mm and triple weighing to 0.1 mg before and after the test, all handled with clean gloves and plastic tweezers.

The aerosol corrosion test of 5.3 uses a matched pair of 1 m3 cabinets or 20 m3 chambers of stainless steel or aluminium alloy and glass under equal conditions, one for the test group and one for a control in which the disinfectant is replaced by test water or the disinfection factor is switched off, while the full immersion test of 5.4 soaks or continuously flushes three pieces of each metal for 72 hours in at least 200 mL of disinfectant per piece at the highest working concentration, the disinfectant being renewed daily where its active ingredient is volatile or unstable.

The standard carries ICS code 11.080 and Chinese classification C 50, was issued on 6 March 2020 and has applied since 1 October 2020.

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Document preview — GB/T 38498-2020

National Standard of the People's Republic of China

ICS: 11.080
Classification: C 50

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Foreword3
1 Scope4
2 Normative references4
3 Terms and definitions4
4 Evaluation principle5
5 Test methods6
6 Calculation and report of metal corrosion rate11

1 Scope

This Standard specifies evaluation method for corrosion of disinfectants and disinfection equipment to metals under the conditions of aerosol spray, ultrasonic atomization, vaporization, gas, constant spray, wiping, immersion or washing disinfection.

This Standard is applicable to evaluation on corrosion of metals by disinfectants that come into contact with various metal and alloy materials during the disinfection process and disinfection instruments that use chemical factors to disinfect.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

GB/T 700, Carbon structural steels

GB/T 1173, Casting aluminium alloys

GB/T 1175, Casting zinc alloys

GB/T 1176, Casting copper and copper alloys

GB/T 1220, Stainless steel bars

GB/T 2481.1, Bonded abrasives - Determination and designation of grain size distribution - Part 1: Macrogrits F4 to F220

3 Terms and definitions

For the purposes of this document, the following terms and definitions apply.

3.1 Corrosion

4 Evaluation principle

Table 2 -- Disinfectant metal corrosion classification (corrosion rate R in mm/a, level):

< 0.0100: Basically no corrosion

0.0100 ~ < 0.1000: Mild corrosion

0.1000 ~ < 1.0000: Moderate corrosion

>= 1.0000: Severe corrosion

5 Test methods

5.1 Main test equipment

5.1.1 Metal and alloy material samples

5.1.1.1 Appearance requirements

Round. Diameter is 24.00mm. Thickness is 1.0mm. Penetrate a small hole with a diameter of 2.0mm. The total surface area is about 9.80cm2 (including the upper, lower, peripheral surface and the side of the small hole).

5.1.1.2 Material and quality requirements

5.1.1.2.1 Carbon steel shall meet the requirements of GB/T 700. Carbon steel is easy to oxidize and rust and shall be stored in oil.

5.1.1.2.2 Copper shall meet the requirements of GB/T 1176.

5.1.1.2.3 Aluminum shall meet the requirements of GB/T 1173.

5.1.1.2.4 Stainless steel shall meet the requirements of GB/T 1220.

5.1.1.2.5 Zinc shall meet the requirements of GB/T 1175.

5.1.1.3 Selection requirements

5.1.1.3.1 The size and thickness (specifications) of the metal sheets used shall be consistent. The surface shall be polished.

5.1.1.3.2 Metal samples can only be used once. It shall not affect the accuracy of the test.

5.1.2 Sandpaper

The sandpaper for removing the metal oxide layer is 120 grit water sandpaper.

Sandpaper shall meet the requirements of GB/T 2481.1. Each piece of sandpaper can only grind one metal material.

5.1.3 Test water

5.2.2

density is 1.19gcm-3) at room temperature for 1min~3min;

b) Carbon steel sheet: Soak in 75°C~90°C ammonium citrate solution (200g of ammonium citrate is added with purified water to 1000mL) for 20min;

c) Aluminum sheet: Soak in nitric acid solution (100mL of 66%~68% nitric acid is added with purified water to 1000mL; nitric acid density is 1.42gcm-3) at room temperature for 1min~5min;

d) Stainless steel: Soak in 60°C nitric acid solution (100mL of 66%~68% nitric acid is added with purified water to 1000mL; density of nitric acid is 1.42g.cm-3) for 20min;

e) Zinc: Soak in 70°C ammonium chloride solution (100g of ammonium chloride is added with purified water to make 1000mL of solution) for 2min~5min.

5.2.2.2 After removing the corrosion products and cleaning the metal sample, use coarse filter paper to absorb moisture. Place in a petri dish with filter paper.

Put into a 50°C incubator. Dry 1h. Use a plastic tweezer to clamp. Take out and store in a desiccator. Place at room temperature and weigh.

5.2.3 Sample measurement

5.2.3.1 Use a Vernier caliper to measure the diameter, thickness and aperture of the sample before the test (to the nearest of 0.1mm). Calculate the total surface area of the sample.

5.2.3.2 Use an analytical balance to respectively weigh the sample before and after cleaning. Zero the balance. Weigh each metal piece 3 times, to the nearest of 0.1mg. Take the average value as the weight before and after the test.

5.2.3.3 When performing operations such as measuring size and weighing, clean gloves shall be worn. The measuring tools used shall be clean and free of oil. Use a plastic tweezer to clamp the sample. Do not touch the sample directly with your hands.

5.3 Aerosol corrosion test

5.3.1 Test preparation

For a pair of adjacent aerosol cabinets (1m3) or aerosol chambers (20m3), one is used for test and the other for control. The environment (including temperature, humidity, light, airtightness and ventilation conditions) of a pair of aerosol cabinets or aerosol chambers shall be consistent. The cabinet (or chamber) shall be constructed of stainless steel or aluminum alloy and glass.

Temperature and humidity adjustment devices, as well as ventilator devices and corresponding pipes shall be installed.

5.3.2

test needs to be interrupted for a long time, the test samples of the test group and the control group shall be taken out of the aerosol cabinet (or chamber) at the same time. Perform sample treatment in the same way as the sample after the test is completed. Store in a desiccator after processing until the test is resumed.

5.3.4 Test control

In the control group, except for replacing the disinfectant with test water or turning off the disinfection factor of the disinfector, the rest of the test steps and processes are the same as the test group. After the cycle is over, remove the metal piece. Use the same method to clean, chemically treat, rinse, dry, and weigh the samples of the test group. Calculate its average weight loss.

5.4 Full immersion corrosion test

5.4.1 Disinfectant replacement

For disinfectors with volatile or unstable active ingredients, such as chlorine dioxide, acid potential water and oxidizing disinfectants, the disinfectant used to soak the sample is changed once a day. When replacing the disinfectant, the operation shall be rapid. The sample shall not be exposed to the air for too long.

For disinfectors with stable active ingredients, such as guanidine, phenols, quaternary ammonium salts, aldehydes, there is no need to change the disinfectant used to soak the sample.

5.4.2 Test steps

5.4.2.1 Soaking method: Prepare the disinfectant for testing according to the highest concentration of disinfectant. Use it to soak the test sample. When soaking, each metal piece needs to be soaked in at least 200mL of disinfectant.

5.4.2.2 Continuous flushing method: Adjust the generator disinfection factor to the highest concentration. Insert the outlet pipe (non-metallic) into the bottom of the soaking container. Turn on the generator. Adjust the flow to make the disinfectant overflow continuously and the sample metal sheet not swing significantly.

5.4.2.3 The disinfectant in a container can only soak or rinse the same metal.

5.4.2.4 Tie a label with plastic thread for metal sample. Indicate the number and date and hang in the disinfectant. Continuously soak or rinse for 72h.

5.4.2.5 Place 3 samples per test for each metal. When soaking or rinsing, if each sample of the same metal is separated by more than 1cm, it can be carried out in the same container (it contains 600mL of disinfectant for soaking method).

5.4.2.6 After soaking or rinsing for the specified time, remove the metal piece. […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

Referenced standards

Normative references

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