Detection liquid for detecting corrosion resistance of surface passivation film of tinned steel plate

Abstract

The invention provides detection liquid for detecting the corrosion resistance of a surface passivation film of a tinned steel plate. The detection liquid comprises the following component in parts by total weight: 0.1-5 parts of inorganic acid, 0.01-5 parts of organic acid, 0.1-5 parts of an oxidant, 0.05-2.5 parts of a complexing agent and 82-100 parts of water, wherein the inorganic acid is one or more of hydrochloric acid, sulfuric acid, nitric acid and phosphoric acid; the organic acid is one or more of lactic acid, citric acid and glycolic acid; the oxidant is ferric trichloride and/or copper chloride; the complexing agent is potassium ferricyanide. The invention further provides a method for detecting the corrosion resistance of the surface passivation film of the tinned steel plate. According to the scheme provided by the invention, the intensity of the corrosion resistance of the surface passivation film of the tinned steel plate can be intuitively and accurately evaluated according to the color change of the detection liquid dropwise added onto the surface passivation film of the tinned steel plate and/or the change of state of corrosion points on the surface passivation film.

Description

technical field [0001] The invention belongs to the development and application of a method for judging the corrosion resistance of a passivation film on a surface of a material, and relates to a detection solution for detecting the corrosion resistance of a passivation film on a tinned steel plate surface. Background technique [0002] Tin-plated steel (commonly known as tinplate) packaging materials due to its good sealing, preservation, light-proof, firmness, unique metal decoration effect, and can provide good protection for food, beverages and other contents in terms of physical and chemical properties. Its performance determines its wide application in the field of packaging containers, especially in the field of food and beverage packaging containers. [0003] In the field of food and beverage production, in order to prolong the shelf life of products, the corrosion resistance of tinned steel sheets used for food and beverage packaging has high requirements, and the c...

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Problems solved by technology

[0004] At present, there is no effective method for the research and evaluation of the corrosion resistance of the passivation film on the surface of the tin-plated steel sheet, and there is no quick and effective means to judge the corrosion resistance of the passivation film. The quality management in the

Although electrochemical methods have been used in the field of material corrosion and protection to study the properties of passivation films on the surface of materials, due to expensive instruments, long test time, complicated use processes, etc., electrochemical methods have not yet been able to achieve electrochemical methods on the surface of tin-plated steel sheets. Rapid on-line detection and evaluation of corrosion resistance of passivation film

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