Standard No.:	JGJ/T 251-2011
English Name:	Technical specification for anticorrosion of building steel structure
Chinese Name:	建筑钢结构防腐蚀技术规程
Professional Classification:	JG    Professional Standard - Building
Source Content Issued by:	MOHURD
Issued on:	2011-7-13
Implemented on:	2012-3-1
Status:	valid
Target Language:	English
File Format:	PDF
Word Count:	8000 words
Translation Price(USD):	200.0
Delivery:	via email in 1 business day

1 General 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

Foreword I 1 General 2 Terms and Symbols 3 Design 3.1 General Requirements 3.2 Surface Treatment 3.3 Coating Protection 3.4 Adhesive Strength 4 Construction 4.1 General Requirements 4.2 Surface Treatment 4.3 Coating Construction 4.4 Metal Thermal Spraying 5 Acceptance 5.1 General Requirements 5.2 Surface Treatment 5.3 Coating Construction 5.4 Metal Thermal Spraying 6 Safety, Health and Environmental Protection 6.1 General Requirements 6.2 Safety and Health 6.3 Environmental Protection 7 Maintenance Management Appendix A Types of Gases in Atmopheric Environment Appendix B Common Anticorrosion Protective Layer Systems Appendix C Common Sealing Agent, Sealing Paint, and Coating Layer Paint Appendix E Quality Acceptance Record Table for Inspection Lots of Anticorrosion Coating of Building Steel Structure Explanation of Wording List of Quoted Standards