Compositions For Use In Corrosion Protection
a composition and corrosion protection technology, applied in the direction of chemistry apparatus and processes, wellbore/well accessories, coatings, etc., can solve the problems of acid corrosion and corrosion problems (reaction between acid and metals), and achieve the effects of reducing corrosion, reducing corrosion, and reducing corrosion
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embodiment 1
[0058]Although bulk CuI powder may dissolve in or react with acidic solutions at elevated temperatures, it is difficult to achieve good dispersion under typical mixing conditions (from about 0° C. to 50° C.), and the reactive method to produce CuI particles in-situ is not desirable (see US published patent application 2011 / 0100630) as the reaction conditions near the well head may change (e.g., change in temperature during the day or with seasons), and as this mixture travels down the well, the temperature and the pressure changes rapidly. As one embodiment of this innovation, it is much more preferable to use pre-formed dispersible particles with low solubility in aqueous solutions including acidic aqueous liquids. One way to pre-form such particles, such as of CuI, is to form particles with their surfaces functionalized so that the particles remain suspended in the acidic fluids and remain uniformly dispersed. The size of surface functionalized particles which disperse in a liquid...
embodiment 2
[0073]In another embodiment, the corrosion inhibition formulation comprises surface functionalized particles of low solubility solid materials as corrosion inhibitor intensifiers (CII). A preferred CII comprises surface functionalized particles of cuprous salts, especially CuI. This means that the formulation comprises of other corrosion inhibitors, but CII are added to enhance synergistically the corrosion inhibition. Typically CII are used when it is desired that the acids will contact metals at a temperature greater than about 200° F. Although these CIIs may be used with any inhibitors, some standard examples of corrosion inhibitors used in the industry are acetylenic alcohols, alkenyl phenones, aromatic aldehydes, nitrogen containing heterocyclics, quaternary salts and condensation products of carbonyls and amines, potassium iodide, sodium iodide, lithium iodide. Some the preferred corrosion inhibitors for use with cuprous salts, particularly CuI belong to the following classes ...
embodiment 3
[0081]In another embodiment, the corrosion inhibitor formulation combines at least three materials of which at least one is a cationic surfactant, the second is a phenylpropoanoid and the third is selected from at least one of a monomeric material and a nitrogen containing compound. It has been observed that not only does one obtain synergistic effects by combining these, but also some corrosion inhibitors are superior in limiting the weight loss while some others at limiting pitting corrosion, thus providing superior performance as a mixture. It is also preferred that the formulation contain a higher weight percentage of the monomeric or the nitrogen containing material as compared to the other two constituents. It is also preferred that the monomeric material and / or the nitrogen containing material and the phenylropanoid together exceed the amount of the cationic surfactant by a factor of two or more by weight and preferably by a factor of 8 or more and most preferably by a factor...
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