Water Treatment Corrosion Inhibition Of Sodium Humate Synergistic Effect
3.3HA-Na and sodium gluconate synergy
Sodium gluconate is used earlier in recent years, again to be emphasis on a multi-hydroxy acid-based water treatment agent. It is in aqueous solution on the Fe3 +, Cu2 +, Ca2 + and other ions are good chelating ability, and many salts of these ions are also very good to activation of Environment No direct or indirect damage [6]. For the study of glucose and sodium HA? Na inhibition synergy testing of different dosage of HA-Na and sodium gluconate compound used on carbon steel corrosion inhibition results in Table 4. Can be seen, HA_Na and sodium gluconate compound the effect of general use as they are effective when used alone. This may be because, HA_Na sodium and glucose are stable in aqueous solution is not easy, affecting their performance.
3.4HA-Na and Zn2 + and sodium gluconate synergy
To study HA-Na, sodium gluconate, and Zn2 + inhibition synergy test the HA? Na with different amount of sodium gluconate and Zn2 + compound used on carbon steel corrosion inhibition results in Table 5 . HA-Na to 30mg / L, Zn + to 2 ~ 10mg / L, sodium gluconate is 10 ~ 30mg / I, the corrosion rate on carbon steel up to 74 to 89 above. To the formula of Zn shaking play the advantages of film speed, and sodium gluconate structure more stable hydroxy well Zn2 +, and thus reduce the hydroxyl and carboxyl HA-Na in the role, HA-Na of scale dispersion can also be full. The triple formula to solve the HA? Na with Zn2 + and sodium gluconate alone when the problems compound, showed excellent corrosion inhibition.
3.5HA-Na explore the inhibition mechanism
Functional groups affect the corrosion inhibition performance of the main factors. As the HA? Na molecules containing hydroxyl, carboxyl and other active groups, these groups with a more negative charge, can be provided to the metal blank track Electronic To the metal surface covered Fe304, SiO2 and CaCO3 with HA? Na complex, and in the metal surface to form a stable chemical adsorption protective film dense?? Neutral insulating layer, thereby separating the metal surface and corrosive media, slowing the metal surfaces corrosion, and to corrosion inhibition.
4 Conclusion (1) of sodium humate alone or when certain carbon steel corrosion inhibition; and the composition of the binary formula Zn2 + on the carbon steel has a good synergistic effect; while the second component with sodium gluconate element formulation is not synergistic effect on the carbon steel, which together form the ternary formulations showed strong synergistic effect, in a certain range of concentration on the corrosion rate of carbon steel up to 74 ~ 89%.
(2) The corrosion inhibition mechanism of humic acid sodium mainly in its molecules contain hydroxyl, carboxyl and other active groups, makes the HA-Na easy to compact the metal surface to form a stable chemical adsorption protective film.
References: [1] Liu Guohua, XI Dan-li, Li Yan, et al. Environmental protection Type water treatment agent for non-phosphorus compound [J]. Corrosion and Protection, 2003,24 (11) :480-482.
[2] Zheng Ping. Coal humic acid production and application [M]. Beijing: Chemical Industry Press, 1991.128 ~ 132.
[3] Gang-Ming Zou, Kai-Cheng Ling. Characterization of humic acid and sodium salt of the scale effect [J]. Coal Conversion, 1994,17 (2) :43-46.
[4] HG/T2159? 1991. Determination of corrosion performance of water treatment agent?? Rotating hanging plate method [S].
[5] He Tielin. Water Treatment Chemicals Manual [M]. Beijing: Chemistry Industry Press, 2000.187.
[6] Lu Zhu, Lan-Kun Cai, Chen Zhongxing, et al. Water Treatment Chemicals [M]. Beijing: Chemical Industry Press ,2002-319.
Water Treatment Corrosion Inhibition Of Sodium Humate Synergistic Effect
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