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Solid corrosion inhibitor for pickling power station boiler

A boiler acid and corrosion inhibitor technology, applied in the field of corrosion inhibitors, can solve the problems of corrosion, hidden dangers, pitting corrosion on the surface of carbon steel metal, etc., and achieve the effects of inhibiting penetration, slowing corrosion, and avoiding hydrogen bubbling

Active Publication Date: 2018-01-05
青岛沃尔特节能工程技术有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In acid cleaning, as long as there is rust, Fe 3+ , due to Fe 3+ Oxidation is strong, and it will aggravate the pitting corrosion on the metal surface of carbon steel when oxidizing Fe. The metal surface with pitting corrosion will form an anode of electrochemical corrosion during the operation of the equipment, and continue to accelerate the corrosion of this point, leaving the safety of equipment operation. Hidden danger

Method used

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  • Solid corrosion inhibitor for pickling power station boiler
  • Solid corrosion inhibitor for pickling power station boiler
  • Solid corrosion inhibitor for pickling power station boiler

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with the embodiments of the present invention. The description of the embodiments is only to facilitate the understanding and application of the present invention, but not to limit the protection of the present invention.

[0029] Preparation of solid corrosion inhibitors for pickling of power plant boilers, including 14 parts of urotropine, 7 parts of ammonium thiocyanate, 0.8 parts of promethazine, 0.2 parts of benzotriazole, 3 parts of stannous chloride, and 3 parts of sodium thiosulfate , 2 parts of thiourea.

[0030] The following test experiments are all carried out by adding the above power plant boiler pickling solid corrosion inhibitor at a mass concentration of 0.15%. As a comparison, the lan-826 corrosion inhibitor with a mass fraction of 0.25% is selected as a comparative example.

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Abstract

A pickling solid corrosion inhibitor for power plant boilers, belonging to the field of corrosion inhibitors, comprising 12-15 parts of urotropine, 6-8 parts of ammonium thiocyanate, 0.6-1 part of promethazine, and 0.1-0.2 parts of benzotriazole part, 2-5 parts of tin protochloride, 2-5 parts of sodium thiosulfate, 1-3 parts of thiourea, the solid corrosion inhibitor of the present invention except most acids except nitric acid, to the absolute majority of acids except zinc and aluminum Most metals have good corrosion inhibition efficiency, and the present invention fully considers various corrosion and safety hazards such as H+ ion corrosion, H atom corrosion, Fe3+ corrosion, Cu2+ corrosion in the acidic process, and has more comprehensive corrosion inhibition points and higher corrosion inhibition efficiency. Higher, wider range of use and other outstanding advantages.

Description

technical field [0001] The invention relates to the field of corrosion inhibitors, in particular to a solid corrosion inhibitor for pickling of power plant boilers. Background technique [0002] Pickling and descaling of power plant boilers is a necessary measure to clean the heated inner surface and prevent accidents caused by corrosion and scaling on the heating surface. It is also one of the effective measures to improve the thermal efficiency of the boiler and improve the water vapor quality of the unit. Power plant boilers are pressure vessels. The selection of corrosion inhibitors is a key part of pickling and descaling. Most pickling corrosion inhibitors are mainly to solve the H + Corrosion inhibition, H atom corrosion, Fe 3+ Corrosion, Cu 2+ Corrosion, due to the corrosion mechanism and the H in the acidic cleaning agent + Different, the impact on the total corrosion amount is small, and the harm to conventional equipment is also small, which is often not realize...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/06
Inventor 朱建清杨建玲
Owner 青岛沃尔特节能工程技术有限公司
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