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Carbon steel pickling solution, and applications thereof

A technology of pickling liquid and carbon steel acid, applied in the field of carbon steel pickling liquid, can solve the problems of high operation risk, slow sulfuric acid pickling speed, poor effect, etc., and achieves low acid concentration, low processing difficulty, inhibition The effect of excessive corrosion

Active Publication Date: 2017-05-10
CHANGZHOU XIAOGUO INFORMATION SERVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional carbon steel pickling process includes sulfuric acid pickling and hydrofluoric acid nitric acid pickling process. The sulfuric acid pickling speed is slow and the effect is not good. The hydrofluoric acid nitric acid cleaning speed is fast, but the cleaning process will release harmful gases to the human body, and the operation is dangerous. sex big

Method used

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  • Carbon steel pickling solution, and applications thereof
  • Carbon steel pickling solution, and applications thereof
  • Carbon steel pickling solution, and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The current pickling solution formula mostly uses sulfuric acid (H 2 SO 4 ) and phosphoric acid (H 3 PO 4 ) and add other additives on this basis. In the experiment without adding other additives, the H 2 SO 4 Screening was performed by electrochemical experiments at different concentrations. h 2 SO 4 Concentrations are 100-400ml / L respectively.

[0038] Depend on figure 1 It can be seen that the H 2 SO 4 When the concentration is 400ml / L, 350ml / L, and 250ml / L, the open circuit potential value is relatively large. The smaller values ​​are 0.4843V, 0.4610V, 0.4437V. At the same time, it can be seen that with H 2 SO 4 As the concentration increased, the open circuit potential value gradually increased. h 2 SO 4 When the concentration is 400ml / L, the pickling solution has the least corrosion on the steel sheet.

[0039] H 2 SO 4 The optimal content to add is 400ml / L, the use temperature is normal temperature, and the time is 25min.

Embodiment 2

[0041] Add 400ml / L of H to the steel sheet 2 SO 4 After that, different concentrations of phosphoric acid (H 3 PO 4 ) The anodic polarization curve in pickling solution is shown in figure 2 . It can be seen that in the presence of H 2 SO 4 and H 3 PO 4 The stable passivation zone ΔE on the anodic polarization curve in the pickling solution is more than that of pure 400ml / L H 2 SO 4 broaden in solution. h 3 PO 4 When the concentration is 100ml / L, the open circuit potential of the steel sheet is 1.06V, and when the concentration is 20-80ml / L, the stable passivation zone ΔE of the steel sheet is 0.65V, 0.62V, 0.72V, 0.69V, combined with the open circuit potential-time curve Analyzing the best H 3 PO 4 The concentration is 100ml / L.

[0042] H 2 SO 4 with H 3 PO 4 The optimal content to add is 400ml / L and 100ml / L respectively, the use temperature is normal temperature, and the time is 25min.

Embodiment 3

[0044] Anodic polarization curves of steel sheets in pickling solutions with different corrosion inhibitors image 3 . It can be seen from the figure that the coincidence degree of the anodic polarization curves of the steel sheets in this kind of corrosion inhibitor pickling solution is very high, and they all have a wide and stable passivation zone. The corrosion inhibitor is hexamethylenetetramine (C 6 h 12 N 4 ), the stable passivation zone width ΔE of the steel sheet is the largest, which is 1.28V, and the corrosion inhibitor is triethanolamine borate (C 6 h 12 BNO 3 ) when the stable passivation zone width ΔE of the steel sheet is the smallest, which is 1.08V. The corrosion inhibitor is barium petroleum sulfonate (R-SO 3 Ba), urea (CH 4 N 2 O), thiourea (CH 4 N 2 S), the stable passivation region width ΔE is equal, both are 1.11V. Generally speaking, the width ΔE of the stable passivation zone of the steel sheet in the pickling solution of other corrosion inh...

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Abstract

The invention relates to a carbon steel pickling solution, and applications thereof, and more specifically relates to a carbon steel pickling corrosion inhibitor used for avoiding corrosion of acid on carbon steel materials and excessive consumption of a pickling solution in pickling process of carbon steel and products of carbon steel, and applications of the carbon steel pickling corrosion inhibitor, and belongs to the technical field of carbon steel pickling solution. The carbon steel pickling solution can be widely used at normal temperature; sulfuric acid and phosphoric acid are taken as the main inorganic acids; corrosion inhibitor polyethylene glycol, thiourea, hexamethylenetetramine, and urea are added at the same time; surfactant fatty alcohol ether sodium sulfate and nonylphenol polyoxyethylene ether are combined with oleic acid and oxalic acid. The carbon steel pickling solution is capable of inhibiting excess corrosion of pickling solution, increasing the cleanliness and washing efficiency of carbon steel part surfaces greatly, reducing acid concentration of pickling waste solution, and reducing processing difficulty greatly.

Description

technical field [0001] The invention relates to a carbon steel pickling solution and its application, in particular to a carbon steel pickling corrosion inhibitor for preventing carbon steel and its products from being corroded by acid on carbon steel materials and excessive consumption of acid solution in the pickling process and The application thereof belongs to the technical field of carbon steel pickling solution. Background technique [0002] During the production process of carbon steel products, due to high temperature or long-term exposure to acid-base media, an oxide film or rust layer will be formed on the surface, which will seriously affect the appearance or service life of carbon steel products. The significance of carbon steel pickling is to remove the oxide layer or rust layer on the surface of carbon steel products, so that it can continue subsequent processing, so as to achieve beautiful appearance and longer service life. [0003] The traditional carbon s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25F1/06C23F11/04
CPCC23F11/04C25F1/06
Inventor 李树白姚培刘英莉马迪孙毓韬刘媛张启蒙周熙雯张斌
Owner CHANGZHOU XIAOGUO INFORMATION SERVICES
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