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Corrosion inhibitor

a corrosion inhibitor and corrosion inhibitor technology, applied in anti-corrosion paints, polyurea/polyurethane coatings, coatings, etc., can solve the problems of inability to meet environmental requirements, invariably less effective than chromate counterparts, and achieve improved corrosion resistance, prevent further corrosion, and prevent further corrosion

Inactive Publication Date: 2020-05-28
HEXIGONE INHIBITORS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent text describes a coating that prevents corrosion on metal surfaces. The coating contains an organic cation in a resin, which is released when exposed to a corrosive environment. This organic cation can be deprotonated and react with a metal cation to form a protective precipitate. The use of a cationic resin eliminates the need for a chloride counterion and improves the cure of coatings on metal substrates. Additionally, the patent describes the use of an inorganic cation modified silica as a second corrosion inhibitor, which works synergistically with the organic cation to prevent corrosion-induced coating failure.

Problems solved by technology

Current anti-corrosion inhibitors comprise sparingly soluble chromium salts such as zinc or strontium chromate, which have a degree of toxicity which is not environmentally acceptable.
Although alternative, environmentally acceptable (Cr (vi)-free) inhibitive pigments, typically based on sparingly soluble phosphate slat technologies are available, they are invariably less effective than their chromate counterparts.

Method used

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Embodiment Construction

[0047]The present invention has been developed to provide a smart-release corrosion inhibitor which has particular but not exclusive application in the protection of galvanised steel from corrosion. The inhibitor, which is usually applied as a primer to a metal surface in liquid form at room temperature and pressure contains an organic ion, preferably an azole, and even more preferably benzotriazolate (BTA). This is added to an ion exchange matrix. The ion exchange resin matrix in one embodiment is a divinylbenzene copolymer with a sulphonate functional group as shown below. The benzene ring with the three nitrogen atoms is benzatriazolate and is positively charged due to extra hydrogen cation. The ion exchange resin matrix is the remainder and is shown as being negatively charged.

[0048]The corrosion inhibitor structure is formed of repeating units of the ion exchange resin with a sulphonated group having a negative charge to hold the corrosion inhibiting cation of protonated benzot...

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Abstract

The present invention relates to a corrosion inhibitor and a corrosion inhibiting coating provided for coating a metal, particularly but not exclusively steel. The inhibitors pigment will also protect aluminium and magnesium alloys. The corrosion inhibitor particularly protects a sacrificial coating such as zinc or zinc alloy on galvanised steel, which in turn therefore provides improved corrosion resistance to the underlying steel. The present invention comprises an organic cation in a cation exchange resin.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a corrosion inhibitor and a corrosion inhibiting coating provided for coating a metal, particularly but not exclusively steel. The inhibitors pigment will also protect aluminium and magnesium alloys. The corrosion inhibitor particularly protects a sacrificial coating such as zinc or zinc alloy on galvanised steel, which in turn therefore provides improved corrosion resistance to the underlying steel.BACKGROUND OF THE INVENTION[0002]Corrosion inhibitors sometimes referred to as corrosion inhibitive pigments in the form of sparingly soluble inorganic salt powders, dispersed within an organic coating have been traditionally used to protect a wide range of metallic surfaces, including steel and galvanised steel. A typical steel coating system is shown in FIG. 1 and comprises a steel substrate 2, a metallic coating 4 (to sacrificially protect the steel substrate, typically comprising zinc or a zinc alloy), a conversion coating ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C09D5/08C09D129/14C09D133/00C09D175/04C08F212/14
CPCC09D175/04C09D129/14C09D133/00C09D5/084C08F212/30C09D5/086C09D5/082C08K3/36C08K5/005C08K5/3472C08K5/3475C09D7/62C09D7/68C08K3/014
Inventor DODDS, PATRICK
Owner HEXIGONE INHIBITORS LTD
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