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| CORROSION INHIBITION OF METHYLENEPHOSPHONIC ACIDS WITH R-N-[CH_2 PO(OH)-2]_2 STRUCTURE IN SULFURIC ACID SOLUTION |
| Zhou Mingpeng; Wang Kaiming; Diao Yuemin;Zhou Bensheng(Nanjing Institute of Chemical Technology) |
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Abstract Corrosion inhibition of ATMP(aminotrimethylene phosphonic acid),MADMP(methylaminodimethy lene phosphonic acid),BADMP(n-butyl-aminodimethylene phosphonic acid) and HEDP(1-hydroxyethylidene 1,1-diphosphonic acid) for 1Cr13 stainless steel in deaerated 0.10 mol/L H2SO4 at 30℃ was studied by linear polarization method. It is found that the corrosion inhibition of these met hyle nephosphonic acidswith R-N-[CH2PO(OH)2]2 structure is much better than of urotropine(hexameth lenetetramine).They act as mixed type(ano-cathodic) corrosion inhibitors.Their adsorption obeys Langmuir isotherm equation,and the adsorption equilibrium constants are 2.67×103,0.85×103 and 0.55×103 L/mol for ATMP,MADMP and BADMP respectively.According to their contribution to corrosion inhibition,the functionalgroups in these methylenephosphonic acid molecules may be arranged as:-CH2PO(OH)2 -CH3 -nC4H9.
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Received: 25 August 1994
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Cite this article:
Zhou Mingpeng; Wang Kaiming; Diao Yuemin;Zhou Bensheng(Nanjing Institute of Chemical Technology). CORROSION INHIBITION OF METHYLENEPHOSPHONIC ACIDS WITH R-N-[CH_2 PO(OH)-2]_2 STRUCTURE IN SULFURIC ACID SOLUTION. J Chin Soc Corr Pro, 1994, 14(4): 283-290.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1994/V14/I4/283
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