Methods for corrosion control of steel in aqueous environment using passive iron-sulphur layers

a technology of passive ironsulphur and corrosion control, which is applied in the direction of solid-state diffusion coating, coating, chemistry apparatus and processes, etc., can solve the problems of severe corrosion to steel or iron parts, and the vulnerability of underground gas wells to such corrosion

Inactive Publication Date: 2011-10-27
THE JOHN HOPKINS UNIV SCHOOL OF MEDICINE +1
View PDF1 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Water can cause severe corrosion to steel or iron parts that are located in aqueous environments containing chlorides, acids or other corrosive components at high levels.
Underground gas wells are particularly susceptible to such corrosion, due to the potentially harmful environment in which natural gas can be found.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Methods for corrosion control of steel in aqueous environment using passive iron-sulphur layers
  • Methods for corrosion control of steel in aqueous environment using passive iron-sulphur layers
  • Methods for corrosion control of steel in aqueous environment using passive iron-sulphur layers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0012]The present invention provides a novel approach to corrosion protection by creating a passive iron-sulphur barrier on the steel to protect it. The barrier is created by adding sulphur to the corrosive aqueous environment of the steel parts, which then reacts with exposed iron resulting from any initial corrosion to form a passive iron-sulphur barrier.

[0013]Solubility of the sulphur in the corrosive aqueous environment is important to allow for rapid forming of the passive iron-sulphur barrier. It is therefore important to find forms of sulphur that are safe, stable and quickly dissolvable in water. The present inventor has found that organic sulphur salts derived from carbon disulphide and thiophosphate salts are surprisingly effective forms of sulphur for the present application. For the purposes of the present invention, the phrase “organic sulphur salts” is used to describe and include all of the organic sulphur salts derived from carbon disulphide and thiophosphate salts o...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
depthaaaaaaaaaa
Login to view more

Abstract

A method is taught for protecting steel parts from corrosion due to exposure to a corrosive aqueous environment. The method comprises adding a first quantity of organic sulphur salts to the corrosive aqueous environment, wherein the first quantity of organic sulphur salts react with iron, formed from corrosion of the steel parts, to form a passive iron-sulphur barrier. A second quantity of organic sulphur salts is added to the aqueous medium over the life of the steel parts to maintain a predetermined sulphur concentration in the corrosive aqueous environment to maintain the passive barrier. Also taught is the use of organic sulphur salts in protecting steel parts from corrosion due to exposure to a corrosive aqueous environment.

Description

FIELD OF THE INVENTION[0001]The present invention relates to methods of preventing steel corrosion in aqueous environments using passive iron-sulphur layers formed on the steel surface.BACKGROUND OF THE INVENTION[0002]Water can cause severe corrosion to steel or iron parts that are located in aqueous environments containing chlorides, acids or other corrosive components at high levels. Underground gas wells are particularly susceptible to such corrosion, due to the potentially harmful environment in which natural gas can be found.[0003]It is important to be able to protect to such steel parts in situ in both a simple and inexpensive manner. As well, due to the highly corrosive environment surrounding the steel parts, it is crucial that the protective means take effect quickly, preferably immediately, to avoid damage to the steel parts that will then require costly repair.[0004]Currently corrosion inhibiting chemicals are applied to such steel parts to reduce the affects of corrosion...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(United States)
IPC IPC(8): C23C8/42
CPCC09K8/54C23F11/04C23F11/1673C23F11/162C23F11/167C23F11/16
Inventor COUSINS, BRET G.
Owner THE JOHN HOPKINS UNIV SCHOOL OF MEDICINE
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap