• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The method for the inhibition of corrosion of ferrous metals in an aqueous medium consists in adding to the aqueous medium 10 to 2000 ppm of a mixture constituted by a water-soluble complex salt of a metal of groups II to VIII of the periodic table and of a hydroxycarboxylic acid and by a phosphoric ester of alkanolamine.
    公开号:SU878201A3
    申请号:SU772502601
    申请日:1977-07-13
    公开日:1981-10-30
    发明作者:Крамбе Мишель；Гранжетт Анри；Пиветт Пьер；Айкур Филипп
    申请人:Сосьете Насьональ Елф-Акитэн；Сека С.А.(Фирма)；
    IPC主号:
    专利说明:

    This invention relates to the protection of metals against corrosion in an aqueous medium using inhibitors, in particular in seawater. Water is widely used as a cooling agent in industrial heat exchange processes; however, it has a corrosive effect on many metals. In this connection, various inhibitor additives have been proposed that reduce the corrosion of these metals. The effect of these additives, which are usually a mixture of organic and inorganic substances, is based on reactions with a metal surface to form thin films of the complex metal compound, which prevent diffusion of the gas dissolved in water, namely oxygen, to the protected surface. A corrosion inhibitor of ferrous metals in an aqueous medium is known, which includes a mixture of hydroxycarboxylic acid, such as gluconic acid, zinc sulfate, and organophosphorus compound Cl. However, this inhibitor is not sufficiently effective. The closest to the present invention is an inhibitor of corrosion of ferrous metals in an aqueous medium, which is used as the alkanolamine phosphoric ester 2}. The purpose of the invention is to increase the effectiveness of protection. The goal is achieved by the fact that the inhibitor, containing phosphoric ether of di- or triethanolamine, additionally contains zinc citrate in the following ratio of components, wt.%: Phosphoric ether of diyl triethanolamine 25-97.5 O-Y-T o-x-k ;, L Rjg where R and R a are the same or different, are hydrogen or a hydrocarbon radical, having a hydroxyl function, if necessary,
    X is a linear or branched divalent hydrocarbon radical containing from 2 to 4 atoms of carbon.
    The proposed inhibitor is used by introducing it into an aqueous medium in the amount of 20-2000 hours per 1 million hours of water. To achieve full efficacy, it is preferable to use the inhibitor in the form of a solution that is resistant to the treated medium.
    Reducing the concentration of the proposed inhibitor does not lead to an irreversible corrosion process. The corrosion rate can be adjusted to its original level by restoring the inhibitor concentration.
    In the following examples, corrosion is quantified by measuring the weight loss of the sample under normal conditions.
    On the one hand, a corrosive liquid (seawater) is introduced into the experimental device, and a sample of iron with a known mass and surface on the other. The seawater is circulated by a variable feed pump. After the end of the experiment and the removal of various deposits from the sample, the weight of the sample is determined by brushes and decapitation. Corrosion is expressed as the weight loss of the sample, depending on the duration of the Experiment, or as the loss of sample thickness from corrosion, the proposed uniform. Usually this value is indicated in millimeters per year, i.e. this is the loss of thickness corresponding to the annual duration of the experiment (8760 h).
    The appearance of corroded specimens may provide some information as well as the weight of adhering sediments. These deposits are those that are removed by draining and the weight of which can be determined by weighing the sample after brushing, but before it is drained.
    PRI me R 1-4. Corrosion of a piece of polished steel placed in a stream of seawater circulating at a rate of 26.4 cm / s is measured.
    when the temperature of swell liquid and pH of 8.2.
    In Example 1 (control), only seawater is used.
    In example 2, K. seawater is added in the form of a solution of 100 h per 1 ppm of phosphoric ester obtained by reacting phosphoric acid with diethanolamine.
    In example 3, to sea water is added in the form of a solution of 100 h per 1 mln.ch. of citrate of zinc.
    In the example. 4 to sea water is added in the form of a solution of 100 parts per 1 ppm of a mixture of 50-50 phosphoric ether (according to example 2) and zinc citrate (according to example 3).
    The results are shown in Table. one.
    Table
    The results presented in table 1 show that the use of one or another component of the mixture improves the corrosion resistance of the sample, but the use of the proposed inhibitor significantly increases the inhibition of iron corrosion in the environment
    A sample of steel treated in the presence of a mixture of the two components after 72 hours of testing has no trace of local effects.
    Example 5-9. Investigation of the influence of the method on the corrosion that has already begun with a change in the circulation rate of seawater.
    Samples from pieces of steel sheets are immersed in sea water circulating in a closed loop. The metal-liquid contact surface is well bounded by glue. The circulation rate is varied for each sample, as shown in Table 2.
    Continuation of table 2
    From Table 2 it can be seen that the addition of diethanolamine zinc-phosphoric ester after the corrosion of the mixture of citrate after 20 h almost stops the onset of corrosion, which varies according to the law similar to the system that was first inhibited. This result indicates that the inhibitor is active, even eo is applied to a metal whose surface is already altered by corrosion,
    I'll try it on. In experiments in which the corrosion rate is measured electrochemically, the relative proportions of zinc citrate and diethanolamine phosphate ester are changed.
    The working electrode is soft steel, a corrosive environment of seawater with the addition of a constant amount of inhibitor.
    The results are presented in table 3.
    Table 3
    权利要求:
    Claims (1)
    [1]
    Claim
    An inhibitor of corrosion of ferrous metals in an aqueous medium containing phosphNVIPI ’Order 9663/88 di- or triethanolamine ester, characterized in that, with 5Q purpose of increasing the protection efficiency, it additionally contains zinc citrate in the following ratio, wt.%:
    Phosphorus Ester League or Triethanolamine 25-97.5
    Zinc Citrate Else
    类似技术:
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    US3705005A|1972-12-05|Aminoalkylene phosphonate derivatives as corrosion inhibitors in aqueous systems
    KR910003088B1|1991-05-18|Treatment for watre systems to inhibit corrosion and scale formation
    AU764313B2|2003-08-14|Inhibition of corrosion in aqueous systems
    El Warraky2003|The effect of sulphide ions on the corrosion inhibition of copper in acidic chloride solutions
    同族专利:
    公开号 | 公开日
    NL7707835A|1978-01-17|
    NO772429L|1978-01-16|
    BE856457A|1977-10-31|
    FR2358473A1|1978-02-10|
    DK312577A|1978-01-14|
    DE2731711A1|1978-01-19|
    DE2731711C2|1984-10-31|
    NO148077B|1983-04-25|
    GB1555884A|1979-11-14|
    IT1081531B|1985-05-21|
    JPS539246A|1978-01-27|
    OA05686A|1981-05-31|
    DK147320C|1985-01-02|
    DK147320B|1984-06-18|
    FR2358473B1|1979-08-17|
    US4120655A|1978-10-17|
    BR7704568A|1978-05-16|
    NO148077C|1983-08-10|
    引用文献:
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    US3714066A|1970-04-13|1973-01-30|Monsanto Co|Methods of inhibiting corrosion with ethane diphosphonate compositions|
    BE787173A|1971-08-04|1973-02-05|Monsanto Co|SUBSTITUTED TERTIARY AMINES AND METHODS FOR PREPARING THEM|
    US3723347A|1972-05-17|1973-03-27|Monsanto Co|Corrosion inhibition compositions containing substituted diamine phosphonates and processes for using the same|
    US3873465A|1973-02-15|1975-03-25|Nalco Chemical Co|Phospho-ester composition for scale and corrosion inhibition|
    US3868217A|1973-04-02|1975-02-25|Calgon Corp|Corrosion inhibition|
    US4066398A|1973-04-13|1978-01-03|Chemed Corporation|Corrosion inhibition|
    US3932303A|1973-06-04|1976-01-13|Calgon Corporation|Corrosion inhibition with triethanolamine phosphate ester compositions|US4411865A|1979-04-05|1983-10-25|Betz Laboratories, Inc.|Method of corrosion inhibition in aqueous mediums|
    US4250042A|1979-04-16|1981-02-10|The Lubrizol Corporation|Corrosion inhibition in well-drilling operations using aqueous systems containing ammonium carboxylates|
    US4297150A|1979-07-07|1981-10-27|The British Petroleum Company Limited|Protective metal oxide films on metal or alloy substrate surfaces susceptible to coking, corrosion or catalytic activity|
    IT1140959B|1979-10-01|1986-10-10|Chemed Corp|CORROSION INHIBITOR CONSTITUTED BY A GLUCONIC ACID ALUMINUM COMPLEX|
    FR2512072B1|1981-08-31|1984-05-25|Roquette Freres|
    US4512552A|1982-11-16|1985-04-23|Katayama Chemical Works Co., Ltd.|Corrosion inhibitor|
    GB2169890B|1984-05-21|1989-01-11|Borsodi Vegyi Komb|Corrosion inhibiting water-additives and a process for their preparation|
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    DE3511404A1|1985-03-29|1986-10-02|Schmitt, Günter, Prof. Dr., 5100 Aachen|Method for corrosion inhibition in carbon dioxide-containing solutions|
    CA2020858C|1989-07-14|2000-08-08|Sakae Katayama|Water treatment agent and water treatment method for boiler|
    US5948267A|1994-10-07|1999-09-07|Kay Chemical Company|Composition and method for inhibiting chloride-Induced corrosion and limescale formation on ferrous metals and alloys|
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    US5521012A|1995-05-15|1996-05-28|Courtaulds Coatings|Storage stable, water borne, zinc containing coatings|
    US5556451A|1995-07-20|1996-09-17|Betz Laboratories, Inc.|Oxygen induced corrosion inhibitor compositions|
    US5643534A|1995-07-20|1997-07-01|Betzdearborn Inc.|Corrosion inhibitor for alkanolamine units|
    US5712236A|1995-08-02|1998-01-27|Church & Dwight Co., Inc.|Alkali metal cleaner with zinc phosphate anti-corrosion system|
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    JP6424896B2|2014-02-12|2018-11-21|栗田工業株式会社|Use of phosphotartaric acid and its salts for water treatment in water delivery systems|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    FR7621471A|FR2358473B1|1976-07-13|1976-07-13|
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