Rust removing liquid for inner cavity of component

Abstract

The invention relates to a rust removing liquid for an inner cavity of a component. The liquid is characterized by comprising the following raw materials in portion by weight: 10 to 20 portions of phosphoric acid, 2 to 5 portions of nitric acid, 0.1 to 0.3 portion of polyether 2010, 3 to 5 portions of methenamine, 0.5 to 1 portion of industrial alcohol, 100ppm of a p-nitrophenol indicator, and 68to 84 portions of tap water. The rust removing liquid does not contain volatile acids, heavy metal ions, sodium nitrite and other compositions, has the characteristics of non rust residue, long rust prevention period, low cost and non pollution, can be applied to rust removal and rust prevention for cast iron and steel material inner cavity components of automobile, and has significant economicalbenefit.

Description

Technical field: [0001] The invention relates to a derusting liquid for inner cavities of parts, which is applied to the field of derusting inner cavities of cast iron or steel parts of automobiles. technical background: [0002] According to information, the total amount of metal lost due to corrosion and rust in the world is more than 20% of the annual output, and the resulting economic loss is about 1 trillion US dollars. [0003] In 1999, "Guangming Daily" reported that my country's annual corrosion loss was 280 billion yuan, which shows that the loss caused by metal corrosion is huge. [0004] When the metal is in contact with the surrounding medium, the damage caused by chemical and electrochemical actions is called metal corrosion, and the presence of water and the formation of rust is called rust. Except for a few metals, such as gold, platinum, and titanium, all metals have a tendency to transform into ions, which means that metal corrosion is a spontaneous and ubi...

AI Technical Summary

Problems solved by technology

[0014] Application No. 03146767 is 'a neutral oil and rust remover'; application No. 95112070 is 'a kind of acid-free pickling solution' which not only has a slow derusting speed and poor derusting effect, but also contains a large amount of high-cost raw materials. Can not meet the characteristics of mass production of automobiles

[0015] Application No. 88100464 is 'A Low-Temperature Rapid Derusting Solution for Removing Oxidation Layers on Iron and Steel Surfaces'; Application No. 01131523 is 'A Rust-Removing and Antirust Solution for Treating Metal Surface Corrosion'; Application No. 02154470 'A formula for anti-rust and rust-removing liquid on steel surface'; application number 93102793 'a rust-resistant steel surface treatment liquid'; application number 88103516 'steel surface rust and anti-rust treatment agent'; application number 95110621 Patents such as 'a wide temperature phosphating solution for degreasing, rust removal and passivation' or containing volatile hydrochloric acid; or containing polluting ingredients restricted by environmental protection such as chromium trioxide or potassium dichromate, cannot be applied to automobiles in production