摘要:
A dispersion of up to about 70 weight percent elemental sulfur in an aqueous ammonia solution of at least one metal compound selected from the group consisting of soluble zinc and magnesium compounds has reduced corrosive activity toward ferrous metal. The atomic ratio of zinc and/or magnesium to sulfur is from about 0.0002 to about 0.1 and the mole ratio of ammonia to metal compound is from about 0.1 to about 200.
摘要:
A method of inhibiting corrosion in an aqueous system comprising treating said system with 1.0 to 300 parts per million by weight of the total aqueous content of said system, of a composition comprising polyphosphate and polymaleic anhydride or amine adducts thereof in a weight ratio of from 10:1 to 1:10.
摘要:
Plastic articles having volatile corrosion inhibiting properties are described. The plastic articles comprise polyolefin polymer, an inorganic nitrite salt, a trisubstituted phenol and fumed silica.
摘要:
This invention is a method for inhibiting corrosion in aqueous systems containing components composed of aluminum, copper, iron, or alloys thereof. The method comprises (a) incorporating in the aqueous medium 2-10 ppm by weight of tolyltriazole; an effective amount of a biodegradable organic biocide; 500-1000 ppm by weight of sodium metasilicate; 500-2000 ppm by weight of sodium nitrite; and 500-2000 ppm by weight of sodium tetraborate, all of these concentrations being based on the weight of water in the system; and (b) maintaining the pH of the resulting system in the range of 7.5 to 8.0. The method permits longterm operation with very low corrosion rates and bacteria counts. All of the additives to the system are biodegradable, permitting the treated aqueous medium to be discharged to the environment without violating current regulations. The method has special application to solar systems in which an aqueous medium is circulated through aluminum-alloy heat exchangers.
摘要:
A corrosion inhibitor mixture for ammonium sulfate-based fire-retardant compositions includes a water-soluble cyanide compound and ammonium phosphate.
摘要:
Continuous ozone injection into water circulating between a cooling tower and heat exchanger with heavy scale deposits inhibits formation of further deposits, promotes flaking of existing deposits, inhibits chemical corrosion and controls algae and bacteria.
摘要:
A novel group of corrosion inhibiting pigments has been discovered, which is based on zinc molybdate compounds selected from sodium zinc molybdate, potassium zinc molybdate, ammonium zinc molybdate and mixtures thereof, combined with a suitable carrier, so that the proportion of the zinc molybdate compound is such that the Mo content in the pigment is between about 1 and 30% by weight. Such pigments can be prepared in situ by several methods, such as a double decomposition reaction of sodium, potassium or ammonium molybdate and a solution containing dissolved zinc ion, or an addition of an appropriate acid to zinc oxide dispersed in sodium, potassium or ammonium molybdate solution, or an addition of zinc oxide to a solution which comprises molybdic oxide dissolved in an aqueous solution of sodium, potassium or ammonium molybdate. All these methods are simple, economic and lead to non-toxic pigments of essentially white colour, which have anti-corrosive properties comparable to, or better than, those of zinc yellow and other commercially available corrosion inhibiting pigments.
摘要:
To prevent erosion-corrosion of capsules moving by means of a fluid through a pipe line, straight chain, macromolecular materials are deposited on the surfaces of capsules before introduction into the pipe line, a corrosion inhibitor is added to the fluid, and said corrosion inhibitor of higher concentration is deposited to the capsules before a temporary exposure to the atmosphere.
摘要:
A method for inhibiting the corrosion of martensitic and ferritic stainless steel surfaces which are exposed to hot carbonate solutions which comprises contacting said stainless steel surfaces with nickel ions and preferably with at least 10 ppm of nickel ion contained in the hot alkali metal carbonate solution.
摘要:
A method for inhibiting corrosion of non-noble metals in contact with circulating water comprising the steps of adding to circulating water in contact with non-noble metals from 0.5 to 50 gm/m.sup.3 of at least one cyclohexanehexacarboxylic acid and adjusting said water to a pH of from 6 to 9; as well as corrosion inhibitory compositions containing cyclohexanehexacarboxylic acid.
摘要翻译:一种抑制与循环水接触的非贵金属的腐蚀的方法,包括以下步骤:向与非贵金属接触的循环水中添加0.5至50gm / m 3的至少一种环己烷六羧酸并将所述水调节至pH 从6到9; 以及含有环己烷六羧酸的腐蚀抑制组合物。