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Inorganic phosphate corrosion resistant coatings

An anti-corrosion, acid phosphate technology, used in anti-corrosion coatings, metal material coating processes, cement coatings, etc., can solve problems such as toxic gas, environmental waste disposal, and wear resistance of passivation layers.

Active Publication Date: 2012-11-07
LATITUDE 18
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thus, this method has at least the following disadvantages: (i) acid leaching bath / bath which produces sludge formed from the accumulation of reaction products - making the bath less effective and creating environmental waste of sludge and acidic solution Treatment issues; (ii) Oxidizers used in passivation methods produce toxic gases
For example, chlorates generate chlorine, m-nitrobenzenesulfonic acid generates nitrous oxide, potassium permanganate poses an occupational health risk; (iii) the resulting passive layer is not resistant to wear and must therefore be protected by additional coatings Enhanced wear resistance

Method used

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  • Inorganic phosphate corrosion resistant coatings
  • Inorganic phosphate corrosion resistant coatings
  • Inorganic phosphate corrosion resistant coatings

Examples

Experimental program
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Effect test

Embodiment 1

[0075] Example 1: MHP-based corrosion protection layer

[0076] In this example, MHP (Mg(H 2 PO 4 ) 2 2H 2 O), and calcium silicate and alumina are added as fillers to form a slurry. The amount of water used to dilute the MHP-based material can vary depending on the amount of water contained in the starting material (MHP-based materials are difficult to dry when prepared and therefore usually contain some water). Preferably, the dilution water should be added in an amount corresponding to about 20% by weight of the MHP. The amounts of calcium silicate and alumina added as fillers to form the slurry can also vary. In this example, for every 100 g of MHP, 80 g of calcium silicate and 60 g of alumina were added. For every 100 g of MHP, 96 g of MgO were added to the mixture. Calcium silicate and alumina were mixed separately for 10 minutes. When adding the MgO, monitor the temperature of the paste and mix until the temperature reaches about 85°F. The paste was then applie...

Embodiment 2

[0077] Example 2: Anti-corrosion layer on corroded steel surface

[0078] In this example, a calcium silicate-containing MKP-based formulation prepared as a paste was applied to a rusted steel surface. The MKP paste is formed by mixing 1 part through-calcined magnesia (calcined at a temperature greater than about 1300°C), 3 parts potassium dihydrogen phosphate, and 6 parts calcium silicate. To this powder mixture was added 2 parts of water to provide a paste. As mixing continues, initially the paste will cool a few degrees, indicating dissolution of the monobasic potassium phosphate; but the temperature will begin to rise as the magnesium oxide begins to react. Mixing was continued until the temperature of the paste rose to about 85°F, and at the same time, the paste was applied to the rusted steel surface. Upon curing, the top (excess) portion of the coating can be easily removed. However, this hardened layer also removes the corrosion (rust) layer from the plate. Unexpec...

Embodiment 3

[0079] Embodiment 3: Iron oxide base anticorrosion paint

[0080] In this example, 165 g of MHP material was dissolved in 168 g of water by mixing and stirring for about 1 hour. Add 16.5g wollastonite (CaSiO 3 ). The resulting paste was stirred and mixed for about 35 minutes before adding 200 g of hematite (Fe 2 o 3 ) and the paste was continued to stir and mix for about 15 minutes. Then, add 5g magnetite (Fe 3 o 4 ) and the paste was continued to stir and mix for about 10 minutes. Then, the resulting paste was coated on the surface of a polished mild steel plate. Hardens very slowly. There is no detectable heat during curing, however once hardened the coating adheres to the steel surface and cannot be easily removed. This coating provides excellent corrosion protection for steel. On this surface, a second layer of phosphate cement may optionally be added as described in Example 4 below.

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Abstract

This disclosure relates to phosphate coatings that inhibit corrosion of metals, specifically coatings comprising acidic phosphate and alkaline metal oxide / hydroxide components. In one particular embodiment, phosphate-based coating formulations that reduce or eliminate corrosion of steel and other metals are disclosed. In other embodiments, methods for coating steel surfaces with acidic phosphate and alkaline metal oxide / hydroxide components to reduce or eliminate corrosion of the metal surfaces are disclosed.

Description

technical field [0001] The present disclosure relates to coatings comprising acid phosphate and alkali metal oxide / hydroxide components that inhibit corrosion of metals, and in particular to methods of making and coating on metals. Background technique [0002] Corrosion of structural steel and other metals is a serious problem in the construction industry and utilities. Steel deteriorates when exposed to moisture and salty environments, especially at high temperatures. To minimize or reduce the extent of this corrosion, steel alloys are used, such as galvanized (zinc-coated) compositions or chrome-plated compositions. Although this method can solve the problem in the short term, the problem still exists when the steel is exposed to the above-mentioned environment for a long time. The present invention discloses particularly suitable phosphate-based composite coatings that minimize or reduce corrosion of steel or other metals and eliminate the need for the use of steel all...

Claims

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Application Information

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IPC IPC(8): C23C22/07C23C22/22C23C22/78
CPCC23F11/08C04B2111/00525C09D5/08C08K3/32C09D1/06C04B28/34C23C22/68C04B14/30C04B14/304C04B14/308C04B22/062C04B22/064C23C22/07C23C22/22C23C22/78
Inventor 阿伦·S·沃瓦季姆·德罗兹德
Owner LATITUDE 18
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