Chemistry of a single-step phosphate/paint system

Lin, Chhiu Tsu; Lin, Ping; Hsiao, Meen Woon; Meldrum, Dean A.; Martin, Frank L.

doi:10.1021/ie00001a058

Cited by 23 publications

(19 citation statements)

References 7 publications

(11 reference statements)

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“…A coating composition in which the phosphate groups are chemically bonded to the polymer component and which improves the adhesion and forms a metal phosphate has not been reported. The simultaneous phosphating of metals with a phosphatizing agent as an additive in paint has, however, been reported 20, 21. Here the phosphatizing agent must have a dual role.…”

Section: Resultsmentioning

confidence: 99%

Adhesion properties of phosphate‐ and siloxane‐containing polyurethane dispersions to steel: An analysis of the metal–coating interface

Mequanint

Sanderson

Pasch³

2003

J of Applied Polymer Sci

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Polyurethane dispersions containing phosphate and siloxane groups in the main chain were investigated as possible self-assembling metal coatings. Improved adhesion of the polymer to the metal was observed because of the formation of an insoluble metal phosphate layer at the metal-coating interface. The neutralizing amine of the dispersions affected the formation of this metal phosphate, and the metal phosphate formation was dependent on the curing temperature and boiling point of the amine used for neutralization. A crosscut comparative study of adhesion proved that the phosphate-containing coatings had better adhesion because of the formation of ionic bonds at the metal-coating interface. A solid-state adhesion prediction method based on thermodynamic considerations was used. The results of the solid-state adhesion method correlated well with that obtained from the crosscut adhesion test method.

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Section: Resultsmentioning

confidence: 99%

Adhesion properties of phosphate‐ and siloxane‐containing polyurethane dispersions to steel: An analysis of the metal–coating interface

Mequanint

Sanderson

Pasch³

2003

J of Applied Polymer Sci

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“…In this work, a chrome-free single-step in situ phosphatizing coating (ISPC) was used on aluminum alloy (3003 or 3105). This work is based on a patent published earlier, where for an ISPC, an optimum amount of an in situ phosphatizing reagent (ISPR) or a mixture of ISPRs is predisposed in the paint system to form a stable and compatible coating formulation [60]. It is believed that when a chrome-free single-step coating of the in situ self-phosphating paint is applied to a bare metal substrate, the phosphatizing reagent chemically and/or physically reacts in situ with the metal surface to produce a metal phosphate layer and simultaneously forms covalent P-O-C (phosphorus-oxygen-carbon) linkages with the polymer resin.…”

Section: Phenylphosphonic Acid (Ppa)mentioning

confidence: 99%

Recent Development in Phosphonic Acid-Based Organic Coatings on Aluminum

2017

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Abstract:Research on corrosion protection of aluminum has intensified over the past decades due to environmental concerns regarding chromate-based conversion coatings and also the higher material performance requirements in automotive and aviation industries. Phosphonic acid-based organic and organic-inorganic coatings are increasingly investigated as potential replacements of toxic and inefficient surface treatments for aluminum. In this review, we have briefly summarized recent work (since 2000) on pretreatments or coatings based on various phosphonic acids for aluminum and its alloys. Surface characterization methods, the mechanism of bonding of phosphonic acids to aluminum surface, methods for accessing the corrosion behavior of the treated aluminum, and applications have been discussed. There is a clear trend to develop multifunctional phosphonic acids and to produce hybrid organic-inorganic coatings. In most cases, the phosphonic acids are either assembled as a monolayer on the aluminum or incorporated in a coating matrix on top of aluminum, which is either organic or organic-inorganic in nature. Increased corrosion protection has often been observed. However, much work is still needed in terms of their ecological impact and adaptation to the industrially-feasible process for possible commercial exploitation.

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“…This behavior is film thickness dependent, since when it diminished from 10 to 5 pm the anticorrosive behavior was low er as it may be deduced from the shifting in the corrosión potential. Formulations without tannin are claimed to have good anticorrosive properties [24][25][26]; however, it could be seen that corrosión potential decreased as a fimction o f time, approaching the valué corresponding to bare Steel (-750 mV vs. SCE) as well as it was observed with lower film thickness. The initial protection achieved with the free tannin primer may be attributed to phosphoric acid which by itself is not able to produce an effective phosphatizing o f the Steel surface.…”

Section: Electrochemical Tests On Treated Steel Panelsmentioning

confidence: 99%

“…7). The slight increase with time may be due to th e sealing o f pores having small and médium radii and to some oxide formation in the paint film [26,28], Polarization effects are negligible at the measuring frequency employed in this test.…”

mentioning

confidence: 99%