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Corrosion-resistant coating composition

A technology of corrosion resistance and composition, applied in the direction of anti-corrosion coatings, polyester coatings, coatings, etc., can solve problems such as performance degradation

Active Publication Date: 2016-12-14
SWIMC LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, zinc is an expensive material, and attempts to replace even small amounts of zinc in compositions with less costly materials have resulted in significantly reduced performance

Method used

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  • Corrosion-resistant coating composition
  • Corrosion-resistant coating composition
  • Corrosion-resistant coating composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Embodiment 1: preparation coating composition

[0065] Coating compositions (#1 to #6) were prepared by combining the commercially available polyester binder resin components, melamine crosslinkers, and pigment systems shown in Table 1. The resin and crosslinker were blended together using standard mixing techniques known in the art, with a minimum level of leveling agent and amine catalyst (DABCO) to accelerate the crosslinking reaction. The blends were combined with the pigment systems shown in Table 1—to obtain coating compositions #1 to #5. Substrates (ie, galvanized metal panels; aluminum-zinc alloy coatings) were prepared by alkaline cleaning and no pretreatment was applied to the panels other than those indicated. The coating composition was applied to metal panels using standard application methods at a dry film thickness of approximately 0.2-0.3 mils and cured at 296°C (565°F) for 18-28 seconds (depending on line speed and oven design) to Peak metal tempera...

Embodiment 2

[0068] Embodiment 2: performance test

[0069] Salt spray test

[0070] The coating composition of Example 1 was coated on metal test panels, baked and edge burrs were trimmed, and then exposed to salt spray according to ASTM B117 method. Corrosion was assessed by measuring the amount of edge corrosion creep. An average creep of about 5 mm or less after 1000 hours of salt spray exposure is the desired creep limit. figure 1 The results for the coatings from Table 1 are shown in . From figure 1 As can be seen in the ZnMg alloy primers show significantly improved creep results relative to other coating compositions and comparable to pretreated industry standard commercial chromate standard primers. In addition, if figure 1 As shown in , ZnMg alloy pigments with graphene exhibit better corrosion resistance than coatings containing only ZnMg alloy pigments.

[0071] flexibility test

[0072] The coating compositions of Example 1 (especially those containing ZnMg alloy ...

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Abstract

The present invention provides a chromate-free coating composition having excellent corrosion resistance. The coating composition includes a binder system comprising a resin and a pigment system including a metal alloy pigment component and optionally, a carbonaceous component. Coated articles with the coating composition applied to at least a portion of a surface thereof are also provided.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Provisional Patent Application Serial No. 61 / 979,589, filed April 15, 2014, which is hereby incorporated by reference in its entirety. Background technique [0003] Metal products, including aluminum products and steel products, are used in a variety of applications. Conventionally, metal-containing pigments, especially those based on chromate (Cr(VI)), are used as corrosion inhibitors because chromate ions are able to passivate the metal surface, thereby creating a moisture barrier. However, current chromate-based systems are toxic, carcinogenic and require special handling for use and disposal. [0004] Therefore, some chromium-free inhibitors have been developed. These inhibitors include organic inhibitors, phosphates, phosphosilicates, calcium ion-exchanged silicas, vanadates, molybdates, and the like. However, these inhibitors do not provide the level of corrosion resistance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D5/08C09D5/10C09C1/62C08K3/08B32B27/20C09D201/00C22C18/00C22C23/00B22F1/068
CPCC09C1/62C09D5/10C08K3/08C22C18/00C22C23/00C09C1/625C09D5/106C08K7/00C08K3/042C08K2003/0893B22F1/068C09D201/00C09D5/084C09D167/00C23C22/02
Inventor 特德·R·百思特梅洛迪·R·泰勒
Owner SWIMC LLC
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