The history of the development of Chinese metal etching

In the present life, corrosion phenomenon can be seen everywhere, but in ancient times, this phenomenon will not occur, because the world is made of wood, stone and scholar. In the current life, corrosion phenomenon can be seen everywhere, but in ancient times, this phenomenon will not occur, because at that time the world is composed of wood stone, and scholar. Acid is the organic acid, the earliest discovery, such as the yogurt lactic acid, made from lemon citric acid and acetic acid, the acid in the strongest acetic acid. Only by the organic acid is difficult to complete the corrosion process on metal, only when inorganic acids are found, processing technology of chemical corrosion of metals is possible. Apparently the chemical corrosion of metal processing technology to lag found in inorganic acid, which may be related to anti corrosion materials relevant to the development of. In Europe, chemical corrosion process in fifteenth Century to become popular, that is mainly used for machining and corrosion of art.

Have a chance in the application of ancient chemical metal label, in someone's lax in the acid splash in the metal, and found that the metal is the acid bitten part and the surrounding metal form a three-dimensional effect. Be sure to think, an ancestor of humans is a careful person, and the findings document to. With the strong corrosive inorganic acid discovery, discovery and anti-corrosion materials, this technology has been constantly improved and perfected, so it has high practical value.

A metal label law consciously for iron, first recorded appearance in an English manuscript in fifteenth Century. It describes a mixed with salt, active carbon and vinegar corrosive agents, and is composed of a linseed oil painting anticorrosive layer. When processing, the anticorrosive paint in accordance with the requirements of the drawings evenly brush, dried, and then on all surfaces are subjected to corrosive, so, not every surface protective layer is the acidic corrosion agent "bite". In the later start using paraffin wax and other natural resins as a protection layer. Using this method, first in the metal over the whole surface of paraffin coated, and then the requirements of corrosion protective layer removed part of the advance. As we know, this is the origin of stepped chemical corrosion or external corrosion processing.