PL136609B1 - Corrosion inhibitor for protecting coolin water circuits against corrosion - Google Patents

Corrosion inhibitor for protecting coolin water circuits against corrosion Download PDF

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Publication number
PL136609B1
PL136609B1 PL23221281A PL23221281A PL136609B1 PL 136609 B1 PL136609 B1 PL 136609B1 PL 23221281 A PL23221281 A PL 23221281A PL 23221281 A PL23221281 A PL 23221281A PL 136609 B1 PL136609 B1 PL 136609B1
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PL
Poland
Prior art keywords
zinc
inhibitor
corrosion
sulphate
water circuits
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PL23221281A
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Polish (pl)
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PL232212A1 (en
Inventor
Irena Nowoszarkuszewska
Jerzy Kamrowski
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Politechnika Gdanska
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Priority to PL23221281A priority Critical patent/PL136609B1/en
Publication of PL232212A1 publication Critical patent/PL232212A1/en
Publication of PL136609B1 publication Critical patent/PL136609B1/en

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Description

Przedmiotem wynalazku jest inhibitor do ochrony przed korozja obiegów wody chlodniczej. Powszechnie stosuje sie mieszanine polifosforanów i krzemianów alkalicznych z dodatkiem soli cynku. Za najbardziej efektyw¬ na mieszanine inhibitorów uwaza sie polifosforany i chromiany alkaliczne z dodatkiem soli cynku i ewentualnie zwiazku powierzchniowo czynnego na przyklad lignosulfoniany lub pochodne merkaptobenzenotiazolu. Prepara¬ ty zawieraja zwykle 40 mg/l polifosforanów, 20 mg/l chromianów i okolo 1 — 2 mg/l jonów cynkowych /Verma K.N., Gupta M.P. "Studies of the preventian of corrosion by cosling waters", Fertil Technolog. 1975, 12, (333-336); 4 i (337-340) "Corrosion control in circulating water system".Niedogodnoscia opisanych wyzej inhibitorów opartych o polifosforany jest to, ze stanowia one pozywke dla bakterii zelazowych tworzacych szlamy biologiczne w ukladzie chlodniczym.Inhibitor do ochrony przed korozja wodnych obiegów wody chlodniczej, zawierajacy polifosforany, sole cynku, wedlug wynalazku charakteryzuje sie tym, ze sklada sie z5v 20 mg/l polifosforanu sodowego, 5 -r 20 mg/l chlorku cynkowego albo siarczanu cynkowego, korzystnie siarczanu cynkowego, 5 ^ 20 mg/l chlorku niklawego albo siarczanu niklawego, korzystnie siarczanu niklawego i 5 -5- 20 mg/l soli zespolonej w postaci chro¬ mianu cynku z uwodnionym tlenkiem cynku (ZnCr04 Zn(OH)2 ), zawierajacej okolo 67 -s- 75% cynku w przeli¬ czeniu na tlenek cynku i okolo 16% trójtlenku chromu albo trójchlorek glinu ponadto korzystnie 3-r 5 mg/l taniny.Stosowanie soli zespolonej ZnCr04 Zn(OH)2 w przedmiotowym ukladzie inhibitora pozwala na uzyskanie stopnia ochrony przed korozja 50 -f 95%; Wyniki badan wedlug testu korozyjnego przedmiotowego preparatu w stosunku do importowanego wedlug inhibitora USA firmy Nalco 7350 oparty na polifosforanach z dodatkiem soli cynku przedstawiono w ponizszej tablicy.Woda chlodnicza bez inhibitora Stezenie inhibitora (mg/l) - Szybkosc tworzenia osadów __s m2h 0,779 Stopien zmniejszenia pokrycia osadem (%) - Szybkosc korozji stali St3S (mm/rok) 1,511 Stopien ochrony przed korozja (%) - ciag dalszy tablicy na str. 2ciag dalszy tablicy 1 z dodatkiem Nalco 7350 z dodatkiem przedmiotowego | inhibitora 2 100 26 3 0,058 0,091 4 92,6 88 5 0,235 0,079 6 84,4 94,7 Zaleta przedmiotowego inhibitora jest ograniczenie szybkosci korozji stali weglowej o ponad 90%, zmniejsze¬ nie pokrycia powierzchni stalowych osadami wodnymi o okolo 90% oraz posiada on wlasnosci bakteriostatyczne - tysiackrotnie zmniejsza ilosc organizmów bakteryjnych zawartych w wodzie chlodniczej.Inhibitor wedlug wynalazku ilustruja podane nizej przyklady wykonania.Przyklad I. W zamknietym ukladzie chlodzenia stosuje sie inhibitor w ilosci 34 mg/l wody chlodniczej o skladzie: 10mg/l polifosforanu sodowego 6 mg/l ZnS04 12mg/lNiS04 3 mg/l ZnCr04 Zn(OH)2, zawierajacego ok. 67- 73% cynku w przeliczeniu na ZnO i ok. 16% Cr03 3 mg/l taniny Stopien zmniejszenia pokrycia osadem wynosi 88%.Stopien ochrony przed korozja wynosi 95%.Przyklad II. W pólotwartym ukladzie chlodzenia stosuje sie inhibitor w ilosci 38 mg/l wody o skla¬ dzie: 10 mg/l polifosforanu sodowego 6 mg/l ZnCl2 12mg/lNiCl2 7mg/lAlCl3 3 mg/l taniny Stopien zmniejszenia pokrycia osadem wynosi 89%.Stopien ochrony przed korozja wynosi 92%.Przyklad III. W zamknietym ukladzie chlodzenia stosuje sie inhibitor w ilosci 31 mg/l wody chlodni¬ czej o skladzie: 10 mg/l polifosforanu sodowego 6mg/lZnS04 12mg/lNiCl2 3 mg/l ZnCr04 Zn(OH)2 zawierajacego okolo 67 - 75% cynku w przeliczeniu na ZnO i okolo 16% Cr03.Stopien zmniejszenia pokrycia osadem wynosi 82%.Stopien ochrony przed korozja wynosi 93%.Zastrzezenia patentowe 1. Inhibitor do ochrony przed korozja obiegów wody chlodniczej, zawierajacy polifosforany alkaliczne, sole cynku, znamienny t y m, ze sklada sie z 5t 20 mg/l polifosforanu sodowego, 5 4- 20 mg/l chlorku cynkowe¬ go albo siarczanu cynkowego, korzystnie siarczanu cynkowego, 5 -s- 20 mg/l chlorku niklawego albo siarczanu niklawego, korzystnie siarczanu niklawego, 5 -r 20 mg/l soli zespolonej w postaci chromianu cynku z uwodnio¬ nym tlenkiem cynku albo trójchlorku glinu przy czym zespolona sól zawiera okolo 67—75% cynku w przelicze¬ niu na tlenek cynku i okolo 16% trójtlenku chromu. 2. Inhibitor wedlug zastrz. 1,znamienny tym, ze zawiera dodatkowo 3-5% taniny.Pracownia Poligraficzna U? PRL Naklad 100 egz.Cena 130 zl PLThe present invention relates to an inhibitor for the protection of cooling water circuits against corrosion. A mixture of polyphosphates and alkali silicates with the addition of zinc salts is commonly used. Alkaline polyphosphates and chromates with the addition of zinc salts and possibly a surfactant, for example lignosulfonates or mercaptobenzenothiazole derivatives, are considered to be the most effective inhibitor mixture. The preparations usually contain 40 mg / l polyphosphates, 20 mg / l chromates and about 1-2 mg / l zinc ions (Verma K.N., Gupta M.P. "Studies of the preventian of corrosion by cosling waters", Fertil Technolog. 1975.12, (333-336); 4 and (337-340) "Corrosion control in circulating water system". The disadvantage of the polyphosphate-based inhibitors described above is that they are a breeding ground for ferrous bacteria that form biological sludge in the refrigeration system. An inhibitor to protect against corrosion in cooling water circuits, containing polyphosphates, zinc salts, according to the invention is characterized by the fact that it consists of 20 mg / l sodium polyphosphate, 5-20 mg / l zinc chloride or zinc sulphate, preferably zinc sulphate, 5-20 mg / l nickel chloride or sulphate of nickel, preferably nickel sulphate, and 5-20 mg / l of a complex salt in the form of zinc chloride with hydrated zinc oxide (ZnCrO4 Zn (OH) 2), containing about 67 -75% zinc, calculated as the oxide 16% of zinc and about 16% of chromium trioxide or aluminum trichloride, moreover, preferably 3-r 5 mg / l tannin. The use of the complex salt ZnCr04 Zn (OH) 2 in the present inhibitor system allows to obtain the degree of protection against d corrosion 50 -f 95%; The results of the tests according to the corrosion test of the subject preparation in relation to the imported Nalco 7350 inhibitor according to the USA inhibitor, based on polyphosphates with the addition of zinc salts, are presented in the table below. Cooling water without inhibitor Concentration of the inhibitor (mg / l) - Rate of sediment formation __s m2h 0.779 Degree of reduction in coverage sediment (%) - Corrosion rate of steel St3S (mm / year) 1,511 Degree of corrosion protection (%) - table continuation on page 2 Table 1 continuation with Nalco 7350 additive with subject additive | of the inhibitor 2 100 26 3 0.058 0.091 4 92.6 88 5 0.235 0.079 6 84.4 94.7 The advantage of the inhibitor in question is the reduction of the corrosion rate of carbon steel by more than 90%, the reduction of coverage of steel surfaces with water deposits by about 90% and it has bacteriostatic properties - it reduces the number of bacterial organisms contained in the cooling water by a thousand. The inhibitor according to the invention is illustrated by the following examples. Example I. In a closed cooling system, an inhibitor is used in the amount of 34 mg / l of cooling water with the composition: 10 mg / l sodium polyphosphate 6 mg / l ZnS04 12mg / lNiSO4 3 mg / l ZnCr04 Zn (OH) 2, containing approx. 67-73% zinc expressed as ZnO and approx. 16% Cr03 3 mg / l tannin The degree of reduction of the sludge coverage is 88%. protection against corrosion is 95%. Example II. In a semi-open cooling system, an inhibitor is used in the amount of 38 mg / l of water with the following composition: 10 mg / l of sodium polyphosphate 6 mg / l of ZnCl2 12 mg / lNiCl2 7 mg / lAlCl3 3 mg / l of tannin The degree of reduction of the sludge coverage is 89%. protection against corrosion is 92%. Example III. In a closed cooling system, an inhibitor is used in the amount of 31 mg / l of cooling water with the following composition: 10 mg / l sodium polyphosphate 6 mg / lZnSO4 12 mg / l NiCl2 3 mg / l ZnCr04 Zn (OH) 2 containing about 67 - 75% zinc in conversion to ZnO and about 16% Cr03. The degree of reduction of deposit coverage is 82%. The degree of protection against corrosion is 93%. Patent claims 1. Inhibitor for protection against corrosion of cooling water circuits, containing alkaline polyphosphates, zinc salts, characterized by the fact that with 5 t 20 mg / l sodium polyphosphate, 5- 4-20 mg / l zinc chloride or zinc sulphate, preferably zinc sulphate, 5- 20 mg / l nickel chloride or nickel sulphate, preferably nickel sulphate, 5-r 20 mg / l of a complex salt in the form of zinc chromate with hydrated zinc oxide or aluminum trichloride, the combined salt containing about 67-75% zinc, calculated as zinc oxide and about 16% chromium trioxide. 2. An inhibitor according to claim 1, characterized in that it additionally contains 3-5% tannin. Pracownia Poligraficzna U? PRL Mintage 100 copies Price PLN 130 PL

Claims (2)

Zastrzezenia patentowe 1. Inhibitor do ochrony przed korozja obiegów wody chlodniczej, zawierajacy polifosforany alkaliczne, sole cynku, znamienny t y m, ze sklada sie z 5t 20 mg/l polifosforanu sodowego, 5 4- 20 mg/l chlorku cynkowe¬ go albo siarczanu cynkowego, korzystnie siarczanu cynkowego, 5 -s- 20 mg/l chlorku niklawego albo siarczanu niklawego, korzystnie siarczanu niklawego, 5 -r 20 mg/l soli zespolonej w postaci chromianu cynku z uwodnio¬ nym tlenkiem cynku albo trójchlorku glinu przy czym zespolona sól zawiera okolo 67—75% cynku w przelicze¬ niu na tlenek cynku i okolo 16% trójtlenku chromu.Claims 1. An inhibitor for corrosion protection of cooling water circuits, containing alkaline polyphosphates, zinc salts, characterized in that it consists of 5 t 20 mg / l sodium polyphosphate, 4- 20 mg / l zinc chloride or zinc sulphate, preferably zinc sulphate, 5-20 mg / l of nickel chloride or nickel sulphate, preferably nickel sulphate, 5-20 mg / l of zinc chromate salt with hydrated zinc oxide or aluminum trichloride, the combined salt containing approx. 67-75% zinc based on zinc oxide and about 16% chromium trioxide. 2. Inhibitor wedlug zastrz. 1,znamienny tym, ze zawiera dodatkowo 3-5% taniny. Pracownia Poligraficzna U? PRL Naklad 100 egz. Cena 130 zl PL2. An inhibitor according to claim 3. The method of claim 1, characterized in that it additionally contains 3-5% of tannin. Printing Studio U? PRL Mintage 100 copies Price PLN 130 PL
PL23221281A 1981-07-14 1981-07-14 Corrosion inhibitor for protecting coolin water circuits against corrosion PL136609B1 (en)

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PL232212A1 PL232212A1 (en) 1983-01-17
PL136609B1 true PL136609B1 (en) 1986-03-31

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