Chlorine corrosion inhibitor and treatment agent for stainless steel surface and application thereof

Abstract

The invention provides a chlorine corrosion resistant inhibitor and a treating agent for stainless steel surface and application thereof, and relates to the technical field of disinfectants. The chlorine corrosion resistant inhibitor comprises sodium pyrophosphate, sodium dihydrogen phosphate, acetamide and sodium phosphate. The chlorine corrosion resistant inhibitor is added into a hypochlorous acid disinfectant to disinfect the stainless steel so as to inhibit the corrosion of the hypochlorous acid disinfectant to the stainless steel. The concentration of the sodium dihydrogen phosphate in the hypochlorous acid disinfectant is 0.05-0.2 mmol / / L, the concentration of the sodium pyrophosphate in the hypochlorous acid disinfectant is 0.05-0.1 mmol / L, the concentration of the acetamide in the hypochlorous acid disinfectant is 0.05-0.1 mmol / L, and the concentration of the sodium phosphate in the hypochlorous acid disinfectant is 0.05-0.1 mmol / L. The invention overcomes the problem of damage of the hypochlorous acid disinfectant when the stainless steel is disinfected.

Description

Technical Field

[0001] The invention relates to the technical field of disinfectants, and in particular to a chlorine corrosion resistant inhibitor and treatment agent for stainless steel surfaces and applications thereof. Background Art

[0002] Molecular hypochlorous acid, as a chlorine-containing disinfectant, is widely used in medical care, food processing, breeding and planting, public health and other fields due to its strong bactericidal ability, broad-spectrum bactericidal properties and high safety. It has been promoted, applied, recognized and praised by all walks of life.

[0003] However, molecular hypochlorous acid, like other chlorine-containing disinfectants, is corrosive to stainless steel to a certain extent, and the corrosion of stainless steel often takes the form of pitting, intergranular corrosion, crevice corrosion, stress corrosion, and corrosion at welds. This form of corrosion is fast and difficult to detect; often when it is discovered, the stainless steel equipment has been damaged to the point where it cannot be repaired. Due to this shortcoming of chlorine-containing disinfectants, their application and promotion in food processing, medical and health care, breeding and planting, and civil fields are limited, so the technology to inhibit the corrosion of chlorine-containing disinfectants to stainless steel has become a scientific problem that needs to be solved urgently in this field.

[0004] There are two main methods for preparing molecular hypochlorous acid disinfectants: electrolysis and chemical synthesis. The principle of electrochemical synthesis is to convert chloride ions (Cl - ) is oxidized to chlorine (Cl 2 ), chlorine further reacts with water (H 2 O) reaction to generate molecular hypochlorous acid (HOCl); the principle of chemical synthesis is to react sodium hypochlorite with acid (organic acid or inorganic acid) to obtain molecular hypochlorous acid; no matter which method is used to obtain hypochlorous acid, it is corrosive to stainless steel. Therefore, a chlorine corrosion inhibitor and treatment agent for stainless steel surface and its application are urgently needed. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a chlorine corrosion inhibitor for stainless steel surface, wherein the chlorine corrosion inhibitor comprises sodium pyrophosphate, sodium dihydrogen phosphate, acetamide and sodium phosphate;

[0006] Adding a chlorine corrosion inhibitor to a hypochlorous acid disinfectant to disinfect stainless steel to inhibit the corrosion of the hypochlorous acid disinfectant on the stainless steel;

[0007] The concentration of the sodium dihydrogen phosphate in the hypochlorous acid disinfectant is 0.05-0.2 mmol / / L, the concentration of the sodium pyrophosphate in the hypochlorous acid disinfectant is 0.05-0.1 mmol / L, the concentration of the acetamide in the hypochlorous acid disinfectant is 0.05-0.1 mmol / L, and the concentration of the sodium phosphate in the hypochlorous acid disinfectant is 0.05-0.1 mmol / L.

[0008] Preferably, a chlorine corrosion inhibitor for stainless steel surface, the chlorine corrosion inhibitor comprises sodium pyrophosphate, sodium dihydrogen phosphate, acetamide and sodium phosphate;

[0009] Adding a chlorine corrosion inhibitor to a hypochlorous acid disinfectant to disinfect stainless steel to inhibit the corrosion of the hypochlorous acid disinfectant on the stainless steel;

[0010] The concentration of the sodium dihydrogen phosphate in the hypochlorous acid disinfectant is 0.05 mmol / L, the concentration of the sodium pyrophosphate in the hypochlorous acid disinfectant is 0.05 mmol / L, the concentration of the acetamide in the hypochlorous acid disinfectant is 0.05 mmol / L, and the concentration of the sodium phosphate in the hypochlorous acid disinfectant is 0.05 mmol / L.

[0011] Preferably, a chlorine corrosion inhibitor for stainless steel surface, the chlorine corrosion inhibitor comprises sodium pyrophosphate, sodium dihydrogen phosphate, acetamide and sodium phosphate;

[0012] Adding a chlorine corrosion inhibitor to a hypochlorous acid disinfectant to disinfect stainless steel to inhibit the corrosion of the hypochlorous acid disinfectant on the stainless steel;

[0013] The concentration of the sodium dihydrogen phosphate in the hypochlorous acid disinfectant is 0.2 mmol / / L, the concentration of the sodium pyrophosphate in the hypochlorous acid disinfectant is 0.1 mmol / L, the concentration of the acetamide in the hypochlorous acid disinfectant is 0.1 mmol / L, and the concentration of the sodium phosphate in the hypochlorous acid disinfectant is 0.1 mmol / L.

[0014] Preferably, a chlorine corrosion inhibitor for stainless steel surface, the chlorine corrosion inhibitor comprises sodium pyrophosphate, sodium dihydrogen phosphate, acetamide and sodium phosphate;

[0015] Adding a chlorine corrosion inhibitor to a hypochlorous acid disinfectant to disinfect stainless steel to inhibit the corrosion of the hypochlorous acid disinfectant on the stainless steel;

[0016] The concentration of the sodium dihydrogen phosphate in the hypochlorous acid disinfectant is 0.1 mmol / L, the concentration of the sodium pyrophosphate in the hypochlorous acid disinfectant is 0.08 mmol / L, the concentration of the acetamide in the hypochlorous acid disinfectant is 0.08 mmol / L, and the concentration of the sodium phosphate in the hypochlorous acid disinfectant is 0.08 mmol / L.

[0017] On the other hand, the present invention provides an application of a chlorine corrosion inhibitor for stainless steel surface, which is used to prepare a chlorine corrosion treatment agent, as follows:

[0018] S1, mixing hydrochloric acid and sodium hypochlorite to prepare a hypochlorous acid disinfectant;

[0019] S2. Adding a chlorine corrosion-resistant inhibitor to a hypochlorous acid disinfectant, so that the concentration of sodium dihydrogen phosphate in the hypochlorous acid disinfectant is 0.05-0.2 mmol / / L, the concentration of sodium pyrophosphate in the hypochlorous acid disinfectant is 0.05-0.1 mmol / L, the concentration of acetamide in the hypochlorous acid disinfectant is 0.05-0.1 mmol / L, and the concentration of sodium phosphate in the hypochlorous acid disinfectant is 0.05-0.1 mmol / L, to obtain a mixed disinfectant;

[0020] S3, adjusting the pH value of the mixed disinfectant to 5.0-6.5 to obtain an adjusted disinfectant;

[0021] S4. Place the adjusted disinfectant in a pulse electric field for 10-15 minutes to obtain a chlorine corrosion resistant treatment agent.

[0022] Preferably, in step S3, the pH value of the disinfectant is adjusted with 10% hydrochloric acid and sodium nitrate.

[0023] Preferably, in step S4, the distance between the two electrodes of the pulse electric field is 1-3.5 cm, and the aperture of the insulating disk is 0.5-1.5 cm; the pulse amplitude of the pulse electric field treatment is 5-10KV, the pulse frequency is 1000-1300Hz, and the pulse width is 30-40μs.

[0024] Preferably, in the chlorine corrosion resistance treatment agent, the effective chlorine concentration ACC=10mg / L-2000mg / L.

[0025] On the other hand, the present invention provides an application of a chlorine corrosion resistant treatment agent for stainless steel disinfection, wherein the method of use is as follows: the stainless steel is soaked in the chlorine corrosion resistant treatment agent for 10-15 minutes and then cleaned, or the chlorine corrosion resistant treatment agent is sprayed on the surface of the stainless steel and kept for 10-15 minutes and then cleaned.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. The present invention provides a chlorine corrosion resistant inhibitor for the surface of stainless steel, wherein the chlorine corrosion resistant inhibitor comprises sodium pyrophosphate, sodium dihydrogen phosphate, acetamide and sodium phosphate; the chlorine corrosion resistant inhibitor is added to a hypochlorous acid disinfectant to disinfect the stainless steel to inhibit the corrosion of the hypochlorous acid disinfectant to the stainless steel, thereby overcoming the problem of damage to the stainless steel caused by the chlorine-containing disinfectant during disinfection of the stainless steel.

[0028] 2. The chlorine corrosion-resistant treatment agent provided by the present invention includes a hypochlorous acid disinfectant and a chlorine corrosion-resistant inhibitor. The hypochlorous acid disinfectant can effectively disinfect stainless steel. The chlorine corrosion-resistant inhibitor components (sodium pyrophosphate, sodium phosphate, acetamide and sodium phosphate) can form a protective film with the surface of stainless steel. This film can slow down and prevent the corrosion of stainless steel by chlorine-containing disinfectants, so that when stainless steel equipment and products are disinfected with chlorine-containing disinfectants, the disinfection effect is not affected, and the technical barriers to the corrosion of stainless steel by chlorine-containing disinfectants are overcome, thereby extending the service life of stainless steel equipment.

[0029] 3. When preparing the chlorine corrosion resistant treatment agent for the stainless steel surface, the present invention places the adjusted disinfectant in a pulse electric field for 10-15 minutes to prepare the chlorine corrosion resistant treatment agent. The pulse electric field treatment further enhances the permeability and uniformity of the treatment agent, so that it can act more deeply and evenly on the stainless steel surface during application, thereby improving the corrosion resistance.

[0030] 4. The chlorine corrosion resistant treatment agent for stainless steel surface provided by the present invention adds corrosion inhibitor components (sodium pyrophosphate, sodium phosphate, acetamide and sodium phosphate) on the basis of hypochlorous acid disinfectant, wherein inorganic components such as sodium pyrophosphate and sodium phosphate cooperate with the organic component of acetamide to form a composite protective film on the metal surface. The composite protective film has both the firmness of inorganic components and the compactness of organic components, thereby greatly improving the protection effect; the organic component of acetamide forms an organic film by adsorption on the metal surface, and forms a complex with metal ions at the same time. The synergistic effect of such adsorption and complexation enables the corrosion inhibitor to more effectively prevent the corrosion of the corrosive medium on the metal, further enhancing the corrosion inhibition effect of the chlorine corrosion resistant treatment agent; at the same time, in the process of preparing the chlorine corrosion resistant treatment agent, after pulse electric field treatment, the adsorption capacity and film-forming effect of the corrosion inhibitor on the metal surface can be further enhanced, thereby improving the chlorine corrosion resistance. The pulse electric field treatment and the components in the corrosion inhibitor cooperate with each other to jointly improve the overall performance of the treatment agent; sodium phosphate forms a complex or precipitate with metal ions to reduce the activity of metal ions and assist in improving the stability of the corrosion inhibitor.

[0031] 5. The chlorine corrosion-resistant treatment agent provided by the present invention can effectively inhibit the corrosion of stainless steel (SUS304, SUS316). It not only has a good effect under the conditions of the commonly used bactericidal concentration of hypochlorous acid disinfectant (10-300 mg / L), but also under ultra-high concentration conditions such as 2000 mg / L, stainless steel (SUS304, SUS316) will not corrode. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Schematic diagram of pulse electric field;

[0033] Figure 2The corrosion effects of different treatment agents on 304 stainless steel in Experiment 1;

[0034] Figure 3 This is a scanning electron microscope image of the stainless steel test block treated with Example 6 and Comparative Example 6 in Experiment 2, wherein: Figure 3 (a) is a scanning electron microscope image of the test piece of Example 6, Figure 3 (b), 3(c), and 3(d) are scanning electron microscope images of the test block of comparative example 6 at different magnifications;

[0035] Figure 4 This is a metallographic microscope characterization of the surface morphology of the 304 stainless steel specimen in Experiment 3 after being immersed in the chlorine-containing disinfectant of Comparative Example 6 for 5 days;

[0036] Figure 5 The corrosion data of SUS304 in different hypochlorous acid disinfectants at 100 mg / L in Experiment 5;

[0037] Figure 6 The corrosion data of SUS316 in different 100 mg / L hypochlorous acid disinfectants in Experiment 5. DETAILED DESCRIPTION

[0038] Example 1

[0039] A chlorine corrosion inhibitor for stainless steel surface, the chlorine corrosion inhibitor comprising sodium pyrophosphate, sodium dihydrogen phosphate, acetamide and sodium phosphate;

[0040] Adding a chlorine corrosion inhibitor to a hypochlorous acid disinfectant to disinfect stainless steel to inhibit the corrosion of the hypochlorous acid disinfectant on the stainless steel;

[0041] The concentration of the sodium dihydrogen phosphate in the hypochlorous acid disinfectant is 0.05 mmol / L, the concentration of the sodium pyrophosphate in the hypochlorous acid disinfectant is 0.05 mmol / L, the concentration of the acetamide in the hypochlorous acid disinfectant is 0.05 mmol / L, and the concentration of the sodium phosphate in the hypochlorous acid disinfectant is 0.05 mmol / L.

[0042] Example 2

[0043] A chlorine corrosion inhibitor for stainless steel surface, the chlorine corrosion inhibitor comprising sodium pyrophosphate, sodium dihydrogen phosphate, acetamide and sodium phosphate;

[0044] Adding a chlorine corrosion inhibitor to a hypochlorous acid disinfectant to disinfect stainless steel to inhibit the corrosion of the hypochlorous acid disinfectant on the stainless steel;

[0045] The concentration of the sodium dihydrogen phosphate in the hypochlorous acid disinfectant is 0.2 mmol / / L, the concentration of the sodium pyrophosphate in the hypochlorous acid disinfectant is 0.1 mmol / L, the concentration of the acetamide in the hypochlorous acid disinfectant is 0.1 mmol / L, and the concentration of the sodium phosphate in the hypochlorous acid disinfectant is 0.1 mmol / L.

[0046] Example 3

[0047] A chlorine corrosion inhibitor for stainless steel surface, the chlorine corrosion inhibitor comprising sodium pyrophosphate, sodium dihydrogen phosphate, acetamide and sodium phosphate;

[0048] Adding a chlorine corrosion inhibitor to a hypochlorous acid disinfectant to disinfect stainless steel to inhibit the corrosion of the hypochlorous acid disinfectant on the stainless steel;

[0049] The concentration of the sodium dihydrogen phosphate in the hypochlorous acid disinfectant is 0.1 mmol / L, the concentration of the sodium pyrophosphate in the hypochlorous acid disinfectant is 0.08 mmol / L, the concentration of the acetamide in the hypochlorous acid disinfectant is 0.08 mmol / L, and the concentration of the sodium phosphate in the hypochlorous acid disinfectant is 0.08 mmol / L.

[0050] Example 4

[0051] The chlorine corrosion inhibitor described in Example 1 is prepared into a chlorine corrosion treatment agent, specifically as follows:

[0052] S1, mixing hydrochloric acid and sodium hypochlorite to prepare a hypochlorous acid disinfectant;

[0053] S2. Add a chlorine corrosion inhibitor to the hypochlorous acid disinfectant so that the concentration of sodium dihydrogen phosphate in the hypochlorous acid disinfectant is 0.05 mmol / L, the concentration of sodium pyrophosphate in the hypochlorous acid disinfectant is 0.05 mmol / L, the concentration of acetamide in the hypochlorous acid disinfectant is 0.05 mmol / L, and the concentration of sodium phosphate in the hypochlorous acid disinfectant is 0.05 mmol / L to obtain a mixed disinfectant;

[0054] S3, adjusting the pH value of the mixed disinfectant to 5.0 to obtain an adjusted disinfectant;

[0055] S4. Place the adjusted disinfectant in a pulse electric field for 10 minutes to obtain a chlorine corrosion resistant treatment agent.

[0056] Furthermore, in step S3, the pH value of the disinfectant is adjusted with 10% hydrochloric acid and sodium nitrate.

[0057] Furthermore, in step S4, the distance between the two electrodes of the pulse electric field is 1 cm, and the aperture of the insulating disk is 0.5 cm; the pulse amplitude of the pulse electric field treatment is 5KV, the pulse frequency is 1000Hz, and the pulse width is 30μs.

[0058] Furthermore, in the hypochlorous acid disinfectant, the effective chlorine concentration ACC=10 mg / L.

[0059] Example 5

[0060] The chlorine corrosion inhibitor described in Example 2 is prepared into a chlorine corrosion treatment agent, specifically as follows:

[0061] S1, mixing hydrochloric acid and sodium hypochlorite to prepare a hypochlorous acid disinfectant;

[0062] S2. Add a chlorine corrosion inhibitor to the hypochlorous acid disinfectant so that the concentration of sodium dihydrogen phosphate in the hypochlorous acid disinfectant is 0.2 mmol / L, the concentration of sodium pyrophosphate in the hypochlorous acid disinfectant is 0.1 mmol / L, the concentration of acetamide in the hypochlorous acid disinfectant is 0.1 mmol / L, and the concentration of sodium phosphate in the hypochlorous acid disinfectant is 0.1 mmol / L to obtain a mixed disinfectant;

[0063] S3, adjusting the pH value of the mixed disinfectant to 6.5 to obtain an adjusted disinfectant;

[0064] S4. Place the adjusted disinfectant in a pulse electric field for 15 minutes to obtain a chlorine corrosion resistant treatment agent.

[0065] Furthermore, in step S3, the pH value of the disinfectant is adjusted with 10% hydrochloric acid and sodium nitrate.

[0066] Furthermore, in step S4, the distance between the two electrodes of the pulse electric field is 3.5 cm, and the aperture of the insulating disk is 0.5-1.5 cm; the pulse amplitude of the pulse electric field treatment is 10KV, the pulse frequency is 1300Hz, and the pulse width is 40μs.

[0067] Furthermore, in the hypochlorous acid disinfectant, the effective chlorine concentration ACC=300 mg / L.

[0068] Example 6

[0069] The chlorine corrosion inhibitor described in Example 3 is prepared into a chlorine corrosion treatment agent, specifically as follows:

[0070] S1, mixing hydrochloric acid and sodium hypochlorite to prepare a hypochlorous acid disinfectant;

[0071] S2. Add a chlorine corrosion-resistant inhibitor to the hypochlorous acid disinfectant, so that the concentration of sodium dihydrogen phosphate in the hypochlorous acid disinfectant is 0.1 mmol / L, the concentration of sodium pyrophosphate in the hypochlorous acid disinfectant is 0.08 mmol / L, the concentration of acetamide in the hypochlorous acid disinfectant is 0.08 mmol / L, and the concentration of sodium phosphate in the hypochlorous acid disinfectant is 0.08 mmol / L, to obtain a mixed disinfectant;

[0072] S3, adjusting the pH value of the mixed disinfectant to 6 to obtain an adjusted disinfectant;

[0073] S4. Place the adjusted disinfectant in a pulse electric field for 13 minutes to obtain a chlorine corrosion resistant treatment agent.

[0074] Furthermore, in step S3, the pH value of the disinfectant is adjusted with 10% hydrochloric acid and sodium nitrate.

[0075] Furthermore, in step S4, the distance between the two electrodes of the pulse electric field is 2 cm, and the aperture of the insulating disk is 1 cm; the pulse amplitude of the pulse electric field treatment is 8 KV, the pulse frequency is 1200 Hz, and the pulse width is 35 μs.

[0076] Furthermore, in the hypochlorous acid disinfectant, the effective chlorine concentration ACC=100 mg / L.

[0077] Example 7

[0078] The application of the chlorine corrosion resistant treatment agent for the surface of stainless steel provided in Example 6 is used for disinfecting stainless steel. The specific method of use is: soak the stainless steel in the chlorine corrosion resistant treatment agent for 12 minutes and then wash it clean.

[0079] Example 8

[0080] The application of the chlorine corrosion resistant treatment agent for the stainless steel surface provided in Example 6 is used for the disinfection of stainless steel. The specific method of use is: spray the chlorine corrosion resistant treatment agent on the stainless steel surface, keep it for 13 minutes and then wash it.

[0081] Comparative Example 1

[0082] The difference between this comparative example and Example 6 is that no sodium pyrophosphate is added to the chlorine corrosion resistant inhibitor.

[0083] Comparative Example 2

[0084] The difference between this comparative example and Example 6 is that no sodium phosphate is added to the chlorine corrosion resistant inhibitor.

[0085] Comparative Example 3

[0086] The difference between this comparative example and Example 6 is that no sodium pyrophosphate or sodium phosphate is added to the chlorine corrosion resistant inhibitor.

[0087] Comparative Example 4

[0088] The difference between this comparative example and Example 6 is that no acetamide is added to the chlorine corrosion resistant inhibitor.

[0089] Comparative Example 5

[0090] The difference between this comparative example and Example 6 is that no sodium dihydrogen phosphate is added to the chlorine corrosion resistant inhibitor.

[0091] Comparative Example 6

[0092] The difference between this comparative example and Example 6 is that no chlorine corrosion inhibitor is added in this comparative example.

[0093] Comparative Example 7

[0094] The difference between this comparative example and Example 6 is that no pulse electric field treatment is performed.

[0095] Comparative Example 8

[0096] The difference between this comparative example and Example 4 is that no pulse electric field treatment is performed.

[0097] Experiment 1

[0098] Prepare SUS304 test pieces (test piece specifications: 50×100×0.5mm), rinse with deionized water, then rinse with acetone to remove surface oil, place in a drying oven at 105°C for 30 minutes, take out and cool naturally for use, take two pieces each and hang and soak in the stainless steel surface chlorine corrosion resistance treatment agent prepared in Example 6 and Comparative Examples 1-7 (effective chlorine concentration ACC=100mg / L), observe the corrosion of the stainless steel after 30 days, the results are shown in Figure 2 As can be seen from the figure, after immersion for 20 days, the stainless steel of Example 6 did not corrode, while the stainless steel of Comparative Examples 1-7 corroded to varying degrees, among which the stainless steel of Comparative Example 6 had the deepest etch depth and the most serious corrosion.

[0099] Experiment 2

[0100] In order to further observe the morphology of pitting corrosion, the surface morphology of the pitting corrosion area of ​​the stainless steel test pieces (SUS304) treated with Example 6 and Comparative Example 6 in Experiment 1 was observed by scanning electron microscopy. Figure 3 As shown in the figure, it can be found that 304 stainless steel is austenitic stainless steel, and uniform grain boundaries can be observed on the surface; the surface morphology of the SUS304 test piece of Example 6, the grains are arranged neatly, and the overall structure is very uniform, as shown in 3 (a); the test piece of Comparative Example 6 after immersion in chloric acid for 30 days is shown in 3 (b), 3 (c), and 3 (d). Figure 3As can be seen in (b), some granular corrosion products exist; from 3 (c), it can be seen that the small holes in the part of the specimen where pitting corrosion occurs develop in depth, with a diameter of about 150μm; as can be seen in 3 (d), the corrosion products around the pitting corrosion are loose and porous.

[0101] The corrosion phenomenon of stainless steel in hypochlorous acid disinfectant is mainly pitting corrosion, rather than uniform corrosion like carbon steel. This is determined by the characteristics of stainless steel. The oxide film of stainless steel at non-metallic locations, grain boundaries, passivation film scratches, lattice defects, and welding locations is easily damaged, which are sensitive locations for pitting corrosion. Once pitting corrosion occurs in a sensitive location, this location will act as the anode of corrosion and will be corroded first, while other locations will be protected as cathodes, thus forming a typical "large cathode, small anode" corrosion damage pattern, which is prone to pitting corrosion.

[0102] Experiment 3

[0103] The surface morphology of the 304 stainless steel sheet of comparative example 6 in experiment 1 after immersion for 5 days was characterized by metallographic microscope, and it can be clearly seen that there is local pitting corrosion, such as Figure 4 This is consistent with the results of Experiment 2.

[0104] Experiment 4

[0105] (1) Cut 100cm each 2 Two SUS304 test pieces were cleaned and dried to ensure that the sample surface was clean and undamaged;

[0106] (2) Use a sterile cotton swab to dip into the Staphylococcus aureus solution and the Escherichia coli solution and apply them evenly on the surface of SUS304;

[0107] (3) After counting the colonies on the sample surface using a colony counter, place the inoculated SUS304 sample in an incubator and culture it for 24 hours;

[0108] (4) After the incubation, use a colony counter to count the colonies on the sample surface again and record the data, which is recorded as S1;

[0109] (6) The treatment agents prepared in Example 6 and Comparative Example 6 (both with effective chlorine concentration of ACC=100 mg / L) were uniformly sprayed on SUS304. After 15 minutes, the colonies on the sample surface were counted again using a colony counter and the data were recorded as S2.

[0110] (5) Calculate the sterilization rate of SUS304 against Staphylococcus aureus and Escherichia coli under different treatments. Sterilization rate = (S1-S2) / S1×100%. The results are shown in Table 1.

[0111] Table 1 Sterilization rate of SUS304

[0112]

[0113] As can be seen from Table 1, Comparative Example 6 is an existing hypochlorous acid disinfectant, and its bactericidal effect is equivalent to that of Example 6. It can be proved that the chlorine corrosion-resistant treatment agent prepared by the present invention can overcome the disadvantages of the corrosiveness of the existing chlorine-containing disinfectants while still maintaining its excellent disinfection effect.

[0114] Experiment 5

[0115] 1. Use SUS304 and SUS316 standard test pieces, the test piece specifications are: 50×100×0.5mm, prepare six 2000ml glass beakers, wash them, and mark the beakers 1, 2, 3, 4, 5, and 6 for use.

[0116] 2. Beakers 1 and 2 were respectively injected with 2000 ml and 100 mg / L of the hypochlorous acid disinfectant prepared by the electrolysis method mentioned in the background technology; beakers 3 and 4 were respectively injected with 2000 ml and 100 mg / L of the hypochlorous acid disinfectant prepared by the chemical synthesis method mentioned in the background technology; beakers 5 and 6 were respectively injected with 2000 ml of the chlorine corrosion resistant treatment agent prepared in Example 6, and the effective chlorine concentration was ACC = 100 mg / L.

[0117] 3. Clean 6 SUS304 test pieces and 6 SUS316 test pieces with a neutral detergent to remove surface dirt, rinse with deionized water, and then rinse with acetone to remove surface oil. Place them in a drying oven at 105°C for 30 minutes, then take them out and cool them naturally for use.

[0118] 4. Hang two prepared SUS304 test pieces in beakers No. 1, 3, and 5 respectively; hang two SUS316 test pieces in beakers No. 2, 4, and 6 respectively. The two test pieces cannot touch each other or the beakers. The test piece hooks are made of tetrafluoroethylene.

[0119] 5. Seal the mouth of the beaker with sealing film, then wrap it with aluminum foil to avoid light and place it in a dry place at room temperature.

[0120] 6. Take 1 ml of soaking solution every day to test the iron ion concentration. The results are shown in Table 2 and Figure 5 , 6 .

[0121] Table 2 Iron ion concentration test results

[0122]

[0123] The increase in the concentration of iron ions in the immersion solution indicates the occurrence of pitting corrosion. The corrosiveness of the immersion solution to stainless steel (SUS304) is evaluated based on the time of pitting corrosion. The iron ions (Fe 3+ ) concentration changes can accurately determine the occurrence of pitting corrosion in stainless steel.

[0124] From Table 2 and Figure 5 , 6 It can be seen that the hypochlorous acid disinfectant prepared by electrolysis in the No. 1 beaker hanging the SUS304 test piece has a Fe 3+ The sudden increase in concentration indicates that corrosion has begun; the hypochlorous acid disinfectant prepared by electrolysis in the No. 2 beaker hanging the SUS316 test piece has a concentration of 1.577777% and a concentration of 1.37777% in the 13th day. 3+ A sudden increase in concentration indicates the onset of corrosion.

[0125] The hypochlorous acid disinfectant prepared by chemical synthesis in the No. 3 beaker with the SUS304 test piece hanging on it was Fe 3+ The concentration suddenly increased, indicating that corrosion had begun to occur; the hypochlorous acid disinfectant prepared by chemical synthesis in the No. 4 beaker hanging the SUS316 test piece was Fe 3+ A sudden increase in concentration indicates the onset of corrosion.

[0126] The chlorine corrosion resistance treatment agent prepared in Example 6 in the No. 5 beaker hanging the SUS304 test piece was not observed until 30 days. 3+ The concentration change indicates that the corrosion of stainless steel is completely suppressed; similarly, the chlorine corrosion resistance treatment agent prepared in Example 6 in the No. 6 beaker with the SUS316 test piece suspended was not observed until 30 days. 3+ The change in concentration indicates that corrosion is completely inhibited.

[0127] Experiment 6

[0128] Considering that the content of each component of the corrosion inhibitor needs to be reduced as much as possible when hypochlorous acid disinfectant is used in special industries such as electronics and pharmaceuticals, in order to meet the above requirements, the addition amount of each component of the corrosion inhibitor provided by the present invention is reduced to 0.05 mmg / L, and then the corrosion inhibition effect on stainless steel (SUS304) is detected (Example 4).

[0129] The SUS304 test piece was hung in the chlorine corrosion resistance treatment agent prepared in Example 4 and Comparative Example 8 by the method of Experiment 5 for 30 days at room temperature, away from light, and sealed. 1 ml of the immersion solution was taken to detect the iron ion concentration. The results are shown in Table 3.

[0130] Table 3 Effect of pulse electromagnetic field on iron ion concentration test results

[0131]

[0132] As can be seen from Table 3, the SUS304 test piece immersed in the chlorine corrosion resistance treatment agent of Comparative Example 8, without pulse electric field treatment, began to corrode on the 15th day, and the anti-corrosion effect was not thorough; however, after Example 4 was treated with a pulse electric field, no Fe 3+ The changes in ion concentrations indicate that pulsed electromagnetic field interference treatment helps to inhibit the corrosiveness of hypochlorous acid.

[0133] Experiment 7

[0134] In order to confirm the antiseptic effect of the preservative provided by the present invention under higher concentration conditions, in this experiment, the effective chlorine concentration ACC of the hypochlorous acid disinfectant was increased to 500 mg / L, 1000 mg / L, 1500 mg / L, and 2000 mg / L, and the same scheme as Experiment 6 was used to carry out corrosion experiments on SUS304 test pieces and SUS316 test pieces, respectively. 1 ml of the immersion solution was taken to detect the iron ion concentration. The results are shown in Table 4.

[0135] Table 4 Iron ion concentration test results in ultra-high concentration hypochlorous acid disinfectant environment

[0136]

[0137] It can be seen from Table 4 that the chlorine corrosion-resistant treatment agent provided by the present invention can effectively inhibit the corrosion of stainless steel (SUS304, SUS316). Under ultra-high concentration conditions such as effective chlorine concentration ACC=2000 mg / L, stainless steel (SUS304, SUS316) still exhibits excellent corrosion resistance.

Claims

1. A chlorine corrosion inhibitor for stainless steel surface, characterized in that: The chlorine corrosion inhibitor includes sodium pyrophosphate, sodium dihydrogen phosphate, acetamide and sodium phosphate; Adding a chlorine corrosion inhibitor to a hypochlorous acid disinfectant to disinfect stainless steel to inhibit the corrosion of the hypochlorous acid disinfectant on the stainless steel; The concentration of the sodium dihydrogen phosphate in the hypochlorous acid disinfectant is 0.05-0.2 mmol / / L, the concentration of the sodium pyrophosphate in the hypochlorous acid disinfectant is 0.05-0.1 mmol / L, the concentration of the acetamide in the hypochlorous acid disinfectant is 0.05-0.1 mmol / L, and the concentration of the sodium phosphate in the hypochlorous acid disinfectant is 0.05-0.1 mmol / L; The chlorine corrosion resistant inhibitor on the surface of stainless steel is used to prepare a chlorine corrosion resistant treatment agent, specifically as follows: S1, mixing hydrochloric acid and sodium hypochlorite to prepare a hypochlorous acid disinfectant; S2. Adding a chlorine corrosion-resistant inhibitor to a hypochlorous acid disinfectant, so that the concentration of sodium dihydrogen phosphate in the hypochlorous acid disinfectant is 0.05-0.2 mmol / / L, the concentration of sodium pyrophosphate in the hypochlorous acid disinfectant is 0.05-0.1 mmol / L, the concentration of acetamide in the hypochlorous acid disinfectant is 0.05-0.1 mmol / L, and the concentration of sodium phosphate in the hypochlorous acid disinfectant is 0.05-0.1 mmol / L, to obtain a mixed disinfectant; S3, adjusting the pH value of the mixed disinfectant to 5.0-6.5 to obtain an adjusted disinfectant; S4, placing the adjusted disinfectant in a pulsed electric field for 10-15 minutes to obtain a chlorine corrosion resistant treatment agent; In the chlorine corrosion resistance treatment agent, the effective chlorine concentration ACC=10mg / L-2000mg / L.

2. The chlorine corrosion inhibitor for stainless steel surface according to claim 1, characterized in that: The chlorine corrosion inhibitor includes sodium pyrophosphate, sodium dihydrogen phosphate, acetamide and sodium phosphate; Adding a chlorine corrosion inhibitor to a hypochlorous acid disinfectant to disinfect stainless steel to inhibit the corrosion of the hypochlorous acid disinfectant on the stainless steel; The concentration of the sodium dihydrogen phosphate in the hypochlorous acid disinfectant is 0.05 mmol / L, the concentration of the sodium pyrophosphate in the hypochlorous acid disinfectant is 0.05 mmol / L, the concentration of the acetamide in the hypochlorous acid disinfectant is 0.05 mmol / L, and the concentration of the sodium phosphate in the hypochlorous acid disinfectant is 0.05 mmol / L.

3. The chlorine corrosion inhibitor for stainless steel surface according to claim 1, characterized in that: The chlorine corrosion inhibitor includes sodium pyrophosphate, sodium dihydrogen phosphate, acetamide and sodium phosphate; Adding a chlorine corrosion inhibitor to a hypochlorous acid disinfectant to disinfect stainless steel to inhibit the corrosion of the hypochlorous acid disinfectant on the stainless steel; The concentration of the sodium dihydrogen phosphate in the hypochlorous acid disinfectant is 0.2 mmol / / L, the concentration of the sodium pyrophosphate in the hypochlorous acid disinfectant is 0.1 mmol / L, the concentration of the acetamide in the hypochlorous acid disinfectant is 0.1 mmol / L, and the concentration of the sodium phosphate in the hypochlorous acid disinfectant is 0.1 mmol / L.

4. The chlorine corrosion inhibitor for stainless steel surface according to claim 1, characterized in that: The chlorine corrosion inhibitor includes sodium pyrophosphate, sodium dihydrogen phosphate, acetamide and sodium phosphate; Adding a chlorine corrosion inhibitor to a hypochlorous acid disinfectant to disinfect stainless steel to inhibit the corrosion of the hypochlorous acid disinfectant on the stainless steel; The concentration of the sodium dihydrogen phosphate in the hypochlorous acid disinfectant is 0.1 mmol / L, the concentration of the sodium pyrophosphate in the hypochlorous acid disinfectant is 0.08 mmol / L, the concentration of the acetamide in the hypochlorous acid disinfectant is 0.08 mmol / L, and the concentration of the sodium phosphate in the hypochlorous acid disinfectant is 0.08 mmol / L.

5. The chlorine corrosion inhibitor for stainless steel surface as claimed in claim 4, characterized in that: In step S3, the pH value of the disinfectant is adjusted with 10% hydrochloric acid and sodium nitrate.

6. The chlorine corrosion inhibitor for stainless steel surface as claimed in claim 5, characterized in that: In step S4, the distance between the two electrodes of the pulse electric field is 1-3.5 cm, and the aperture of the insulating disk is 0.5-1.5 cm; the pulse amplitude of the pulse electric field treatment is 5-10 kV, the pulse frequency is 1000-1300 Hz, and the pulse width is 30-40 μs.

7. The chlorine corrosion inhibitor for stainless steel surface as claimed in claim 6, characterized in that: Used for stainless steel disinfection. The method of use is: soak the stainless steel in the chlorine corrosion-resistant treatment agent for 10-15 minutes and then clean it, or spray the chlorine corrosion-resistant treatment agent on the stainless steel surface and keep it for 10-15 minutes and then clean it.

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