Background and overview[1][2]
Tetrahydroxy-1,4-benzoquinone is a quinone organic compound that can be used to prepare blackening liquid for metal castings and reagents for generating alkali.
Apply[1-2]
1. Used for chemical oxidation of steel materials. Chemical oxidation of steel materials is a simple and economical process to improve the anti-corrosion ability of steel materials. Blackening is a common means of chemical surface treatment of metals. The principle is to produce an oxide film on the metal surface to isolate air and achieve rust prevention. When the appearance requirements are not high, blackening treatment can be used. The blackening treatment on the surface of steel parts is also called bluing. In the existing blackening process, the workpiece produced has poor surface black uniformity and poor gloss. CN201711245521.3 provides a method for blackening the surface of metal castings. Includes the following steps:
(1) After the surface of the metal casting is shot peened and then decontaminated and degreased, spray the activation liquid on the surface of the metal casting, and then preheat the surface temperature of the metal casting to 55-60°C, where the activation liquid is composed of Made from the following components by weight: 11-16 parts of sodium metaborate tetrahydrate, 10-14 parts of citric acid, and 260-300 parts of water;
(2) Add the metal castings treated in step (1) into the blackening liquid, soak for 2-4 minutes, take it out, clean the surface, and complete the blackening treatment. The blackening liquid consists of the following parts by weight: The ingredients are: 15-24 parts of selenious acid, 4-6 parts of citric acid, 1-3 parts of tetrahydroxy-1,4-benzoquinone disodium salt, and 190-220 parts of water.
2. CN201780040789.5 provides for the use of an aqueous electrolyte medium, such as is commonly used with electrochemical cells. The aqueous electrolyte medium may also contain a weakly basic moiety that participates in oxidation or reduction reactions at the electrode and upon reduction releases one or more hydroxide ions or absorbs one or more protons, thereby changing the pH .
Exemplary base-generating reagents are 1,4-benzoquinone, 1,2-benzoquinone, 1,3-benzoquinone, anthraquinone, Duroquinone, tetrahydroxy-1,4-benzoquinone , alkannin, hexahydroxynaphthoquinone, juglone, Lapachol, Lawsone, Menatetrenone, echinochrome D, Phylloquinone, Plumbagin, echinochrome B, menadione, 1,4-naphthoquinone, 1,2-naphthoquinone, 1,6-naphthoquinone, anthraquinone, isoindole-4,7-dione, Other natural and synthetic quinone derivatives, other phenol derivatives, pyrrole and its related derivatives and polymers, thiophene and its related derivatives and polymers, aniline and its related derivatives and polymers, acetylene derivatives and its polymers , Bipyridinium (Bipyridiniumor) and its derivatives and related compounds, aldehydes, ketones and alcohols, bromide oxides, cyanides, carbonates, hypochlorous acid, hypoiodic acid, mercaptans, organic halides or other weak bases organic or inorganic compounds.
Main reference materials
[1] CN201711245521.3 A method for blackening the surface of metal castings
[2] CN201780040789.5 Enzymatic nucleic acid synthesis
