GB/T 8923.4-2013
Preparation of steel substrates before application of paints and related products.Visual assessment of surface cleanliness.Part 4:Initial surface conditions,preparation grades and flash rust grades in connection with high-pressure water jetting (English Version)

Standard No.

GB/T 8923.4-2013

Language

Chinese, Available in English version

Release Date

2013

Published By

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

Latest

GB/T 8923.4-2013

Scope

This part of GB/T 8923 specifies a series of steel surface preparation grades after high-pressure water jet removal or partial removal of water-soluble contaminants, rust, applied coatings and foreign impurities. The various levels are jointly defined by text descriptions and typical model photos. In addition, this part also stipulates the initial surface state and the level of flash rust after cleaning, which are also defined jointly by text description and typical sample photos. This section describes the visual appearance in relation to the state of cleanliness of the surface. In most cases, it is sufficient to meet the requirements for use. However, for coatings that are likely to be exposed to severe environmental conditions such as water immersion and continuous condensation, ISO 8502 should be considered. The physical and chemical methods specified in each part are tested for the detection of soluble salts and other invisible contaminants on surfaces that have been visually assessed for cleanliness. Although the high-pressure water jet treatment will not produce a rough surface or cause significant changes in the existing roughness, the surface roughness characteristics can still refer to the provisions of ISO 8503.

GB/T 8923.4-2013 Referenced Document

• GB/T 13288 The assessment of profile grades of steel surface before application of paint and related products.Comparator
• GB/T 18570.10 Preparation of steel substrates before application of paints and related products.Tests for the assessment of surface cleanliness.Part 10:Field method for the titrimetric determination of water-soluble chloride
• GB/T 18570.11 Preparation of steel substrates before application of paints and related products.Tests for the assessment of surface cleanliness.Part 11:Field method for the turbidimetric determination of water-soluble sulfate
• GB/T 18570.12 Preparation of steel substrates before application of paints and related products.Tests for the assessment of surface cleanliness.Part 12:Field method for the titrimetric determination of water-soluble ferrous ions
• GB/T 18570.2 Preparation of steel substrates before application of paints and related products.Tests for the assesssment of surface cleanliness.Part 2:Laboratory determination of chloride on cleaned surfaces
• GB/T 18570.3 Preparation of steel substrates before application of paints and related products.Tests for the assessment of surface cleanliness.Part 3:Assessment of dust on steel surface prepared for painting (pressure-sensitive tape method)
• GB/T 18570.4 Preparation of steel substrates before application of paints and related products--Tests for the assessment of surface cleanliness--Guidance on the estimation of the probability of condensation prior to paint application
• GB/T 18570.5 Preparation of steel substrates before application of paints and related products.Tests for the assessment of surface cleanliness.Part 5:Measurement of chloride on surfaces prepared for painting (ion detection tube method)
• GB/T 18570.6 Preparation of steel substrates before application of paints and related products.Tests for the assessment of surface cleanliness.Part 6:Extraction of soluble contaminants for analysis.The Bresle method
• GB/T 18570.8 Preparation of steel substrates before application of paints and related products.Tests for the assessment of surface cleanliness.Part 8:Field method for the refractometric determination of moisture
• GB/T 18570.9 Preparation of steel substrates before application of paints and related products.Tests for the assessment of surface cleanliness.Part 9:Field method for the conductometric determination of water-soluble salts
• GB/T 8923.1-2011 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 coa
• ISO 4628-3 Paints and varnishes - Evaluation of degradation of coatings - Designation of quantity and size of defects, and of intensity of uniform changes in appearance - Part 3: Assessment of degree of rusting*， 2015-12-31 Update

GB/T 8923.4-2013 history

• 2013 GB/T 8923.4-2013 Preparation of steel substrates before application of paints and related products.Visual assessment of surface cleanliness.Part 4:Initial surface conditions,preparation grades and flash rust grades in connection with high-pressure water jetting

GB/T 8923.4-2013 -All Parts