Abstract
In this paper, a saturated long carbon chain sodium monocarboxylate containing 18 carbons—labeled NaC18—was used for the formation of a lead carboxylate coating to inhibit the corrosion of lead in atmospheric conditions and in acetic acid corrosive solutions. The effect of stirring of the coating solution during the coating process on the inhibition efficiency was studied. The coating was characterized by scanning electron microscopy and Fourier transform infrared spectroscopy which have confirmed a formation of lead carboxylate layer on the lead metal surface. The corrosion inhibition properties of the coating were tested using linear sweep voltammetry and electrochemical impedance spectroscopy in a solution simulating the atmospheric conditions and in an acetic acid corrosive solution. Results show that the lead carboxylate forms a protective barrier that inhibits corrosion of lead in atmospheric conditions and in acetic acid corrosive solutions.
Highlights
Lead metal has been used in many applications in ancient times because of its high density and ease of casting due to its low melting point
This work demonstrates the formation of a Pb(C18)2 coating on a lead metal surface
This work demonstrates the formation of a Pb(C18 )2 coating on a lead metal surface
Summary
Lead metal has been used in many applications in ancient times because of its high density and ease of casting due to its low melting point. The lead metal should corrodes, forming a reversible, new PbO stable and carbonates layers protecting cultural heritage objects be transparent, for long time and again. Coatings used for protecting coatingsshould for the archaeological leadreversible, metal objects [13,15,16,17,18,19,20] Those studies tried culturalpreservative heritage objects be transparent, stable for long time andhave environmental carbon chain lengths up to 12, as those sodium carboxylates with carbon chains more than 12 have friendly. Pb(C18 ) complexes on the lead metal surface, respectively, which act as good barriers protecting it solution during the immersion as the stirring might lead to remove a part of the coating from the againstlead corrosion atmospheric conditions. Protective properties were solution during the immersion as the stirring mightthelead to remove a partofofthe thecoating coating from the examined by linear sweep voltammetry (LSV) and electrochemical impedance spectroscopy (EIS) in lead metal surface.
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