Specifications for surface preparation of the substrate in protective coating application projects
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9.2 Implementation of relevant specifications and standards 1. Surface treatment of steel: GB8923 \"Corrosion grades and derusting grades of steel surfaces prior to painting\" (1) Quality grades for steel surface treatment (2) Roughness of the steel surface after treatment (3) Interval between steel surface treatment and the application of the first bottom layer coating 2. Surface treatment of concrete: Article 5.2.10 of HG/T20587 \"Specifications for corrosion protection design in chemical industry buildings\" – \"Application of coatings on cement mortar and concrete substrates\". (1) According to GB50209 \"Code for Construction and Acceptance of Building Floors\", the moisture content of the subbase should be less than 9%. (2) According to GB50212 \"Code for Construction and Acceptance of Building Anti-corrosion Engineering\", the moisture content of the substrate should be less than 6%.
1. The surface treatment of steel materials must be carried out in accordance with the GB8923 standards, which cover aspects such as rust grade, derusting grade, surface roughness, and the time interval before painting. 2. The surface treatment of concrete shall comply with the provisions of HG/T20587, and it is necessary to ensure that its moisture content meets the requirements specified in GB50209 and GB50212, namely less than 9% or 6%. .