Galvanizing equipment descaling cleaner

A technology of galvanizing equipment and cleaning agent, applied in the field of chemical cleaning, which can solve the problems of reducing the service life of equipment, leakage of coolant, corrosion of radiator heat pipes, etc., and achieves fast descaling speed, slow descaling speed, and high corrosiveness Effect

Active Publication Date: 2019-09-20
ENERGY RES INST CO LTD HENAN ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the cooling water used is generally untreated raw water, after a period of use of the cooler, scales, rust, or bacteria and algae often occur on the heat dissipation pipes of galvanized materials, resulting in cooling High temperature occurs due to poor heat dissipation of the device, which seriously affects the cooling effect of the equipment, reduces the service life of the equipment, and consumes water and electricity. It must be chemically cleaned to restore its original function.
However, since metal zinc is a very active amphoteric metal, it is difficult to protect the

Method used

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  • Galvanizing equipment descaling cleaner
  • Galvanizing equipment descaling cleaner
  • Galvanizing equipment descaling cleaner

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Add 2‰ of the single-component corrosion inhibitor monomer, add it to 1 g equivalent / L HCL and oxalic acid solution respectively, and do the corrosion test on Zn metal with a rotary coupon at 25°C for 2 hours; electrochemical Corrosion experiment, and using electron microscope and energy dispersive spectrometer to scan and observe the surface micro-morphology and element composition of the corrosion test piece after the corrosion test, see Table 1.

[0020] Table 1, 1 gram equivalent / L (oxalic acid) solution + 2‰ monomer corrosion inhibitor + pure Zn corrosion rotating coupon, electrochemical, energy spectrum experimental data

[0021]

[0022] It can be seen from Table 1 that in the oxalic acid solution of zinc, the corrosion rate of the corrosion coupons of zinc is generally lower than that in the hydrochloric acid solution of the same concentration. Among them, KLSS-A, hexamethylenetetramine, and PAA have relatively low corrosion rates to metal zinc in the two aci...

Embodiment 2

[0024] The one-component corrosion inhibitor monomer was added in an amount of 2‰, respectively added to the mixed solution of 1 g equivalent / L HCL and oxalic acid, and at 25 ° C, the test time was 2 hours, and the corrosion test of Zn metal was carried out on a rotary coupon; Electrochemical corrosion experiment, and using electron microscope and energy dispersive spectrometer to scan and observe the microscopic appearance of the surface of the corrosion test piece after the corrosion test, the change of element composition, see Table 2.

[0025] Table 2. 1 gram equivalent / L (equivalent ratio oxalic acid: HCL=1:4; 1:5; 1:6; 1:7) + 2‰ monomer corrosion inhibitor + pure Zn corrosion rotary coupon, electrochemical, Energy spectrum experiment data

[0026]

[0027] From the corrosion coupon test data of each corrosion inhibitor monomer in Table 2, combined with the comprehensive judgment of electrochemical analysis and electronic scanning analysis, the corrosion inhibitor mono...

Embodiment 3

[0029] Add different amounts of multi-corrosion inhibitor monomers to the mixed acid of 1 gram equivalent / LHCL and oxalic acid solution (1:6) for compounding. At 25°C, the test time is 2 hours, and the corrosion test of Zn metal is carried out on a rotary coupon; Electrochemical corrosion experiment, and use electron microscope and energy dispersive spectrometer to scan and observe the microscopic appearance of the surface of the corrosion test piece after the corrosion test, and the change of element composition, see Table 3.

[0030] Table 3: 1 gram equivalent / L mixed acid solution (equivalent ratio oxalic acid: HCL=1:6) + different amounts of monomer corrosion inhibitor + pure Zn corrosion rotating coupon, electrochemical, energy spectrum orthogonal experiment results

[0031]

[0032]

[0033] According to the K of different corrosion inhibitor monomers in the experiment of Table 3 1 、K 2 、K 3 It is concluded that the best combination ratio of corrosion inhibitor m...

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Abstract

The invention discloses a chemical cleaner for galvanizing equipment, and belongs to the technical field of chemical cleaning. The chemical cleaner is prepared from, in weight percent, 0.3-1.2% of surface active agents, 0.1-1.2% of imidazoline inhibitors, 0.1-0.8% of dispersing agents, 0.2-0.8% of additives, 7-8% of oxalic acid, 12-14% of hydrochloric acid and the balance water. According to the cleaner, inorganic acid and organic acid are mixed together through best distribution ratio, so that the cleaner has descaling and inhibiting functions, the inorganic acid, the organic acid, dodecyl benzyl ammonium chloride, the amphoteric imidazoline inhibitor and additives are compounded together, the dodecyl benzyl ammonium chloride has a good corrosion inhibition effect on zinc, so that the chemical cleaner for the galvanizing equipment is prepared, and the cleaner has low metal zinc corrosion rate, is high in descaling speed and meets descaling and corrosion inhibition requirements of the industrial galvanizing equipment.

Description

technical field [0001] The invention relates to a descaling and cleaning agent for galvanizing equipment, which belongs to the technical field of chemical cleaning. Background technique [0002] In industrial production, in the new anti-corrosion heat exchange equipment and winter heating equipment, a large number of galvanized heat dissipation pipe coolers are used for heat exchange, water is used as the cooling medium, and the cooled process fluid flows in the heat dissipation pipe, and water and air are simultaneously It flows outside the tube, and the heat of the fluid in the tube is transferred to the air through the water outside the tube to achieve the purpose of cooling. In order to save water in the water-cooled cooler, the water is cooled in the cooling tower and recycled. The coolers often used in large food factories, liquefied gas stations, and steel plants are evaporative coolers. The heat dissipation pipes are made of galvanized iron-based materials. Since th...

Claims

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Application Information

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IPC IPC(8): C11D1/62C11D3/37C11D3/30C11D3/20C11D3/04C11D3/60
CPCC11D1/62C11D3/042C11D3/2082C11D3/28C11D3/30C11D3/3765
Inventor 吴晋英陈敏黄长山徐会武张敏程玉山薛冕张晓光丁鸣陈俊强胡国华邢乃豪张强杨敏芝张蕾
Owner ENERGY RES INST CO LTD HENAN ACADEMY OF SCI
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