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Method for removing chlorine from cultural relics in ironware

A technology for dechlorination and cultural relics, applied in the field of dechlorination treatment of iron cultural relics, can solve the problems of destroying the original appearance of cultural relics, and achieve the effect of prolonging life and reducing charge density

Inactive Publication Date: 2009-02-25
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention solves the problem of destroying the original appearance of cultural relics due to surface corrosion or reaction during the dechlorination process of iron cultural relics, and provides a dechlorination method that is fast, effective, more thorough in dechlorination and more conducive to the preservation of cultural relics

Method used

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  • Method for removing chlorine from cultural relics in ironware

Examples

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preparation example Construction

[0015] Preparation of alkaline compound dechlorination cleaning solution: add anionic surfactant with a mass percentage concentration of 0.1 to 0.5% in a NaOH alkaline solution with a mass percentage concentration of 2%, and an anionic surfactant with a mass percentage concentration of 0.1 to 0.5%. Ionic surfactants, builders with a concentration of 0.01-0.1% by mass, and amine corrosion inhibitors with a concentration of 2-5% by volume, accurately weighed various cleaning agents and corrosion inhibitors and added to 2 % NaOH alkaline solution, stir and mix evenly to make alkaline compound dechlorination cleaning solution.

[0016] Wherein the preferred anionic surfactant is: sodium dodecylbenzenesulfonate or sodium lauryl sulfate or sodium lauricate or triethanolamine; nonionic surfactant is: nonylphenol polyoxyethylene ether; Lotion: sodium tripolyphosphate or sodium carbonate or trisodium phosphate; corrosion inhibitor: ethylenediamine.

[0017] Constant potential cathodic...

Embodiment 1

[0020] Weigh 1g each of the anionic surfactant sodium dodecylbenzenesulfonate and the nonionic surfactant OP-10 and 0.1g of the builder sodium tripolyphosphate, put them into a beaker with a capacity of 1L, and then add 980ml of NaOH solution with a concentration of 2% by mass and 20ml of ethylenediamine were stirred to make the solutions evenly mixed. Put the simulated cast iron cultural relics to be treated into a beaker filled with alkaline compound dechlorination cleaning solution. The test piece to be treated is connected to the negative pole of the potentiostat, the stainless steel anode is connected to the positive pole of the potentiostat, and the anode and cathode are connected to each other. Keep a certain distance between them. After connecting the circuit, turn on the potentiostat and adjust the potential to be constant at -1.15V. Measure the chloride ion concentration in the solution every 24h within a week after starting the treatment, and then every two days, thr...

Embodiment 2

[0022] Weigh 2g of anionic surfactant sodium lauryl sulfate and nonionic surfactant OP-10 and 0.05g of builder sodium carbonate, put them into a beaker with a capacity of 1L, and then add 960ml of mass percentage to the beaker Concentration of 2% NaOH solution and 40ml of ethylenediamine, stirring to mix the solution evenly. Put the simulated cast iron cultural relics to be treated into a beaker filled with alkaline compound dechlorination cleaning solution. The test piece to be treated is connected to the negative pole of the potentiostat, the stainless steel anode is connected to the positive pole of the potentiostat, and the anode and cathode are connected to each other. Keep a certain distance between them. After connecting the circuit, turn on the potentiostat and adjust the potential to be constant at -1.10V. Measure the chloride ion concentration in the solution every 24h within a week after starting the treatment, and then every two days, three days or Measure the conc...

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Abstract

This invention describes a process for the dechlorination of iron antiquities, comprising the steps of: adding a cleaning agent and an amine inhibitor to an alkaline solution to prepare an alkaline dechlorination cleaning solution, and carrying out the cathode polarization dechlorination of iron antiquities in the said solution at a constant electric potential. This invention overcomes such problems as a certain degree of corrosion existing in the traditional dechlorination processes for iron antiquities or the damage to the intrinsic appearances of iron antiquities led by the abscission of the rusty layer resulting from hydrogen evolution caused by high local current in the electrochemical reduction method, and provides a rapid, effective and more protective process for the dechlorination of iron antiquities.

Description

technical field [0001] The invention relates to a method for protecting iron cultural relics, in particular to a dechlorination treatment method for iron cultural relics. Background technique [0002] Iron relics salvaged from the seabed, iron relics unearthed from wet soil environments, and iron relics collected near the sea not only contain a large amount of chloride on the outer surface, but also contain a large amount of chloride ions inside. Due to the small radius of chloride ions, it The penetrating ability and electronegativity are very strong. It can destroy or replace the oxygen ions in the metal oxide to form soluble salts, so that the dense protective film cannot be formed on the surface of the cultural relics, so that the local corrosion continues. Corrosion products rapidly expand and cause permanent damage to cultural relics. So remove Cl - It is an important link to prevent iron artifacts from continuing to corrode. Common methods for removing chloride ion...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25F1/00
Inventor 许淳淳岳丽杰欧阳维真
Owner BEIJING UNIV OF CHEM TECH
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