GB/T 8923.2-2008
Preparation of steel substrates before application of paints and related products.Visual assessment of surface cleanliness.Part 2:Preparation grades of previously coated steel substrates after localized removal of previous coatings (English Version)

Standard No.

GB/T 8923.2-2008

Language

Chinese, Available in English version

Release Date

2008

Published By

General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China

Latest

GB/T 8923.2-2008

Scope

This part of GB/T 8923 specifies a series of treatment grades for steel surfaces after partial removal of the original coating. Various processing levels are jointly defined by text descriptions (see Chapter 4) and typical model photos given in IS (:) 8501-1. In addition, photo samples showing P Sa2 and P Ma treatment grades are given. This part of GB/T 8923 applies to steel surfaces that are pre-treated for coating by methods such as blast cleaning, manual and power tool cleaning, and mechanical grinding. This part of GB/T 8923 uses the visual appearance of steel to indicate its surface cleanliness. In most cases this is sufficient, but for coatings likely to be exposed to harsh environments such as water immersion and continuous condensation, consideration should be given to the use of physical and chemical methods to detect solubility on visually clean surfaces. For salts and other invisible pollutants, see the provisions of each part of ISO 8502 for specific detection methods. Surface roughness characteristics should also refer to the provisions of ISO 8503.

GB/T 8923.2-2008 Referenced Document

• GB/T 5210-2006 Paints and varnishes. Pull-off test for adhesion
• ISO 2409:1992 Paints and varnishes; cross-cut test
• ISO 4627:1981 Paints and varnishes; Evaluation of the compatibility of a product with a surface to be painted; Methods of test
• ISO 4628-1:1982 Paints and varnishes; Evaluation of degradation of paint coatings; Designation of intensity, quantity and size of common types of defect; Part 1 : General principles and rating schemes
• ISO 4628-2:1982 Paints and varnishes; Evaluation of degradation of paint coatings; Designation of intensity, quantity and size of common types of defect; Part 2 : Designation of degree of blistering
• ISO 4628-3:1982 Paints and varnishes; Evaluation of degradation of paint coatings; Designation of intensity, quantity and size of common types of defect; Part 3 : Designation of degree of rusting
• ISO 4628-4:1982 Paints and varnishes; Evaluation of degradation of paint coatings; Designation of intensity, quantity and size of common types of defect; Part 4 : Designation of degree of cracking
• ISO 4628-5:1982 Paints and varnishes; Evaluation of degradation of paint coatings; Designation of intensity, quantity and size of common types of defect; Part 5 : Designation of degree of flaking
• ISO 4628-6:1990 Paints and varnishes; evaluation of degradation of paint coatings; designation of intensity, quantity and size of common types of defect; part 6: rating of degree of chalking by tape method
• ISO 8501-1:1988 Preparation of steel substrates before application of paints and related products; visual assessment of surface cleanliness; part 1: rust grades and preparation grades of uncoated steel substrates and of steel substrates after overall removal of previous

GB/T 8923.2-2008 history

• 2008 GB/T 8923.2-2008 Preparation of steel substrates before application of paints and related products.Visual assessment of surface cleanliness.Part 2:Preparation grades of previously coated steel substrates after localized removal of previous coatings

GB/T 8923.2-2008 -All Parts