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96340 The Evaluation of the Corrosion Resistance of Metallic Substrates Protected By a Hydrophobic Coating

Picture for 96340 The Evaluation of the Corrosion Resistance
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Product Number: 51300-96340-SG
ISBN: 96340 1996 CP
Author: Daniel Lee, Richard Griffin
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With the advent of polymeric materials, various uses for these materials have been discovered in the quest to best utilize their unique characteristics. One property that a few polymers possess is hydrophobicity; that is water repelling. Consequently, one particular use for hydrophobic materials is in the area of corrosion protection. When applied as a coating material, hydrophobic polymers, theoretical] y, should provide excellent protection against corrosive environ ments. In order to ascertain the performance of hydrophobic materials in corrosion service, metallic substrates of aluminum, copper, and steel were coated with a hydrophobic coating termed conformal and wbjected to a variety of intensive analytical examinations including Electrochemical Impedance Spectroscopy, real-time field studies, and scanning electron microscopy. To be able to gage the relative performance of the conformal coat, it was necessary to test simi Iar uncoated metallic substrates as well as similar substrates treated with a non-hydrophc)bic corrosion preventative coat. This allowed direct comparisons to be made between the conformal coat and other commercially available coating products while allowing for an uncoated substrate to act as a baseline reference (i.e. a control). The results of these experiments show that the performance of conformal as a preventative measure against corrosion were below expectations, especially in comparison to other commercially available non-hydrophobic coatings. This is most likely due to inadequate adhesion at the polymer-metal substrate interface. Preliminary results show that significant improvements in corrosion resistance occur through the use of a base coating though the cause for this improvement cannot determined at this time.
With the advent of polymeric materials, various uses for these materials have been discovered in the quest to best utilize their unique characteristics. One property that a few polymers possess is hydrophobicity; that is water repelling. Consequently, one particular use for hydrophobic materials is in the area of corrosion protection. When applied as a coating material, hydrophobic polymers, theoretical] y, should provide excellent protection against corrosive environ ments. In order to ascertain the performance of hydrophobic materials in corrosion service, metallic substrates of aluminum, copper, and steel were coated with a hydrophobic coating termed conformal and wbjected to a variety of intensive analytical examinations including Electrochemical Impedance Spectroscopy, real-time field studies, and scanning electron microscopy. To be able to gage the relative performance of the conformal coat, it was necessary to test simi Iar uncoated metallic substrates as well as similar substrates treated with a non-hydrophc)bic corrosion preventative coat. This allowed direct comparisons to be made between the conformal coat and other commercially available coating products while allowing for an uncoated substrate to act as a baseline reference (i.e. a control). The results of these experiments show that the performance of conformal as a preventative measure against corrosion were below expectations, especially in comparison to other commercially available non-hydrophobic coatings. This is most likely due to inadequate adhesion at the polymer-metal substrate interface. Preliminary results show that significant improvements in corrosion resistance occur through the use of a base coating though the cause for this improvement cannot determined at this time.
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