1.0.1 This Specification was formulated with a view to normalizing the technical requirements of anti-corrosion design, construction, acceptance and maintenance of the building steel structure, guaranteeing the engineering quality, making them technology-advanced, safe and reliable and economically reasonable.
1.0.2 This Specification is applicable to the anti-corrosion design, construction, acceptance and maintenance of newly-built building steel structure in atmospheric environment.
1.0.3 The anti-corrosion design, construction, acceptance and maintenance of building steel structure shall not only comply with the requirements of this Specification, but also comply with those in the current relevant standards of the nation.
2 Terms and Symbols
2.1 Terms
2.1.1 Corrosion rate
The value of corrosion effect of the structure member occurred in unit time
2.1.2 Atmospheric corrosion
Material damage caused due to the chemical and electrochemical action between the material and atmospheric environment medium.
2.1.3 Corrosion allowance
In the design of steel structure member, the corresponding thickness increased with the consideration of potential corrosive wear in operating period.
2.1.4 Coating
The process of coating paints on matrix surface to form coat with protection, finishing or specific functions.
2.1.5 Surface pretreatment
The measure taken for the matrix surface by mechanical method or chemical method before coating in order to improve the binding force and corrosion protection effect between coating and matrix to meet the coating requirements.
2.1.6 Grade of removing rust
The clean degree grade of attachment such as the rust layer on steel surface before coating
2.1.7 Service life of protective layer
The predicted service life of corrosion protection layer under the conditions of reasonable design, correct construction, normal use and maintenance
2.1.8 Adhesive strength
The binding force between dry coating film and its substrate
2.1.9 Metal thermal spraying
The technology process of using high-pressure air, inert gases or electric arc etc. to spray molten corrosion resistant metal to the surface of protected structure to form protective coating
