Influence of polyacrylic acid on the protective properties of the KORSOL inhibitor
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INFLUENCE OF POLYACRYLIC ACID ON THE PROTECTIVE PROPERTIES OF THE KORSOL INHIBITOR Z. V. Slobodyan,1 L. A. Mahlatyuk,1,2 and R. B. Kupovych 1
UDC 620.197.3
Polyacrylic acid (PAA) is a dispersant of hardness salts. Its anticorrosion properties are better than the anticorrosion properties of the dispersants produced by the Nalko Firm. In the KORSOL composition, it does not reveal the synergetic action but does not deteriorate the protective properties of the inhibitor. Keywords: corrosion rate, depth index, degree of protection, corrosion inhibitor, dispersant, polyacrylic acid.
The application of water-soluble polymers in inhibiting compositions for neutral media is realized for two purposes. On the one hand, they act as corrosion inhibitors and, on the other hand, as dispersants of hardness salts deposited on the metal surfaces [1]. It is known that the solutions of high-molecular compounds are lyophilic thermodynamically stable and reversible systems [2]. This is why the inhibitors containing polymeric electrolytes also have stable physicochemical characteristics. The KORSOL inhibitor is a well-known reagent, which efficiently inhibits corrosion and scaling [3]. Note that, in the case of its long-term application, old salt deposits are washed out [4]. However, this process is quite slow and insufficiently efficient. At the same time, by dispersing the deposits, polymeric electrolytes improve the hydrodynamic and heat-exchange characteristics of heating networks, which is especially important for systems whose depreciation period is already exhausted. However, in this case, it is necessary to guarantee that these substances do not weaken the anticorrosion action of the inhibitors. Polyacrylic acid (PAA)
[ CH 2 CH]n |
COOH is known as a substance with moderate dispersing action [5]. However, its anticorrosion properties in waters with various levels of hardness are studied quite poorly. Its influence on the efficiency of the KORSOL inhibitor has not been investigated yet [3]. This is why we analyze the influence of PAA on the protective properties of the inhibitor in waters with various contents of hardness salts. Materials and Procedures We tested specimens of 20 steel (with a diameter of 22 mm and h = 1.5 mm). The KORSOL inhibitor (d = 1.52 g/cm 3 ) was studied at concentrations of 40– 200 mg/dm 3 , PAA (with a molecular mass of 100,000) 1 2
Karpenko Physicomechanical Institute, Ukrainian National Academy of Sciences, Lviv, Ukraine. Corresponding author; e-mail: [email protected].
Translated from Fizyko-Khimichna Mekhanika Materialiv, Vol. 46, No. 1, pp. 123–125, January–February, 2010. Original article submitted April 20, 2009. 1068-820X/10/4601–0139
© 2010
Springer Science+Business Media, Inc.
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Z. V. SLOBODYAN, L. A. MAHLATYUK,
AND
R. B. KUPOVYCH
was studied at concentrations of 20– 80 mg/dm 3 , and the Na7302 (d = 1.46 g/cm 3 ) and Na8510 (d =
1.49 g/cm 3 ) dispersants produced by the Nalko Firm were analyzed at concentrations of 5–100 mg/dm 3 . Different contents of calcium carb
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