GB/T 30790.4-2014 English PDF (GB/T30790.4-2014)

GB/T 30790.4-2014: Paints and varnishes -- Corrosion protection of steel structures by protective paint systems -- Part 4: Types of surface and surface preparation
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GB/T 30790.4-2014
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 87.020
G 50
Paints and varnishes – Corrosion protection
of steel structures by protective paint systems -
Part 4. Types of surface and surface preparation
(ISO 12944-4.1998, MOD)
ISSUED ON. JULY 8, 2014
IMPLEMENTED ON. DECEMBER 1, 2014
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 4
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 8
4 General ... 10
5 Type of surface to be prepared ... 11
6 Surface preparation methods ... 12
7 Surface preparation grades ... 17
8 Surface profile (roughness) and surface profile grading ... 19
9 Assessment of prepared surfaces ... 19
10 Temporary protection of prepared surfaces from corrosion and/or
contamination ... 19
11 Preparation of temporarily or partly protected surfaces before application of
further coatings ... 20
12 Preparation of hot-dip-galvanized surfaces ... 20
13 Preparation of thermally sprayed metal (zinc and aluminium) surfaces ... 21
14 Preparation of zinc-electroplated and sherardized surfaces ... 22
15 Preparation of other coated surfaces ... 22
16 Recommendations regarding pollution and the environment ... 22
17 Health and safety ... 23
Annex A (Normative) Standard preparation grades for primary (overall)
surface preparation ... 24
Annex B (Normative) Standard preparation grades for secondary (partial)
surface preparation ... 26
Annex C (Informative) Procedures for removal of extraneous layers and
foreign matter ... 28
Annex D (Informative) Technical differences between this Part and ISO
12944-4.1998 and their reasons ... 30
Bibliography ... 33
Foreword
GB/T 30790, Paints and varnishes – Corrosion protection of steel structures by
protective paint systems, comprises 8 parts.
-- Part 1. General introduction;
-- Part 2. Classification of environments;
-- Part 3. Design considerations;
-- Part 4. Types of surface and surface preparation;
-- Part 5. Protective paint systems;
-- Part 6. Laboratory performance test methods;
-- Part 7. Execution and supervision of paint work;
-- Part 8. Development of specification for new work and maintenance.
This Part is Part 4 of GB/T 30790.
This Part was drafted in accordance with the rules given in GB/T 1.1-2009.
This Part was redrafted by adopting ISO 12944-4.1998, Paints and varnishes –
Corrosion protection of steel structures by protective paint systems – Part 4. Types of
surface and surface preparation.
This Part has technical differences from ISO 12944-4.1998. The clauses concerning
these differences are marked with vertical single lines (|) in the page margins. Annex
D gives the list of corresponding technical differences and their reasons.
This Part was proposed by China Petroleum and Chemical Industry Federation.
This Part shall be under the jurisdiction of National Technical Committee 5 on Paints
and Pigments of Standardization Administration of China (SAC/TC 5).
The drafting organizations of this Part. CNOOC Changzhou Paint and Chemicals
Research Institute, Zhejiang Feijing Paint Co., Ltd., Yejian New Material Co., Ltd.,
Shandong Puntium Paint Co., Ltd., Hempel (China) Co., Ltd., COSCO Kansai Paint
and Chemicals Co., Ltd., Shenzhen Grandland Decoration Group Co., Ltd., Beijing
Hongshi Paint Co., Ltd., Anhui Linghu Paint Co., Ltd., Beijing BIAM New Materials and
Technological Engineering Co., Ltd.
The main drafters of this Part. Chen Feng, Su Chunhai, Yan Jie, Shi Youliang, Wang
Hui, Huang Shutong, Liu Huicheng, Li Shaoqiang, Li Yunde, Long Maoming, Shi Hua.
Paints and varnishes – Corrosion protection
of steel structures by protective paint systems -
Part 4. Types of surface and surface preparation
1 Scope
This Part of GB/T 30790 deals with the following types of surfaces of steel structures
consisting of carbon or low-alloy steel, and their preparation.
-- uncoated surfaces;
-- surfaces thermally sprayed with zinc, aluminium or their alloys;
-- hot-dip-galvanized surfaces;
-- zinc-electroplated surfaces;
-- sherardized surfaces;
-- surfaces painted with prefabrication primer;
-- other painted surfaces.
This Part defines a number of surface preparation grades but does not specify any
requirements for the condition of the substrate prior to surface preparation.
Highly polished surfaces and work-hardened surfaces are not covered by this Part.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition dated applies to this document. For
undated references, the latest edition of the referenced documents (including all
amendments) applies to this document.
GB/T 8923.1, 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 coatings (GB/T 8923.1-2011, ISO 8501-1.2007, IDT)
GB/T 8923.2, 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, ISO 8501-2.1994, IDT)
GB/T 9286, Paints and varnishes - Cross cut test for films (GB/T 9286-1998, eqv
ISO 2409.1992)
GB/T 9793, Thermal spraying – Metallic and other inorganic coatings – Zinc,
aluminium and their alloys (GB/T 9793-2012, ISO 2063.2005, IDT)
GB/T 13288.1, Preparation of steel substrates before application of paints and
related products – Surface roughness characteristics of blast-cleaned substrates
– Part 1. Specification and definitions for ISO surface profile comparators for the
assessment of abrasive blast-cleaned surfaces (GB/T 13288.1-2008, ISO 8503-
1.1988, IDT)
GB/T 13288.2, Preparation of steel substrates before application of paints and
related products – Surface roughness characteristics of blast-cleaned steel
substrates – Part 2. Method for the grading of surface profile of abrasive blast-
cleaned steel – Comparator procedure (GB/T 13288.2-2011, ISO 8503-2.1988,
IDT)
GB/T 13912, Metallic coatings – Hot-dip-galvanized coatings on fabricated iron
(GB/T 13912-2002, ISO 1461.1999, MOD)
GB/T 17850.1, Preparation of steel substrates before application of paints and
related products – Specifications for non-metallic blast-cleaning abrasives –
General introduction and classification (GB/T 19850.1-2002, ISO 11126-1.1993,
MOD)
GB/T 17850.3, Preparation of steel substrates before application of paints and
related products – Specifications for non-metallic blast-cleaning abrasives –
Copper refinery slag (GB/T 17850.3-1999, eqv ISO 11126-3.1993)
GB/T 17850.6, Preparation of steel substrates before application of paints and
related products – Specifications for non-metallic blast-cleaning abrasives – Part
6. Iron furnace slag (GB/T 17850.6-2011, ISO 11126-6.1993, IDT)
GB/T 18570.2, Preparation of steel substrates before application of paints and
related products – Tests for the assessment of surface cleanliness – Part 2.
Laboratory determination of chloride on cleaned surfaces (GB/T 18570.2-2009,
ISO 8502-2.2005, IDT)
GB/T 18570.3, Preparation of steel substrates before application of paints and
related products – Test for the assessment of surface cleanliness – Part 3.
Assessment of dust on steel surface prepared for painting (pressure-sensitive tape
method) (GB/T 18570.3-2005, ISO 8502-3.1992, IDT)
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
18570.4-2001, eqv ISO 8502-4.1993)
GB/T 18838.1, Preparation of steel substrates before application of paints and
related products – Specifications for metallic blast – Cleaning abrasives – Part 1.
General introduction and classification (GB/T 18838.1-2002, ISO 11124-1.1993,
MOD)
GB/T 18838.3, Preparation of steel substrates before application of paints and
related products – Specifications for metallic blast-cleaning abrasives – Part 3.
High-carbon cast steel shot and grit (GB/T 18838.3-2008, ISO 11124-3.1993, IDT)
GB/T 18838.4, Preparation of steel substrates before application of paints and
related products – Specifications for metallic blast-cleaning abrasives – Part 4.
Low-carbon cast-steel shot (GB/T 18838.4-2008, ISO 11124-4.1993, IDT)
GB/T 18839.1, Preparation of steel substrates before application of paints and
related products – Surface preparation methods – General principles (GB/T
18839.1-2002, eqv ISO 8504-1.2000)
GB/T 18839.2, Preparation of steel substrates before application of paints and
related products – Surface preparation methods – Abrasive blast-cleaning (GB/T
18839.2-2002, eqv 8504-2.2000)
GB/T 18839.3, Preparation of steel substrates before application of paints and
related products – Surface preparation methods – Hand- and power-tool cleaning
(GB/T 18839.3-2002, eqv ISO 8504-3.1993)
GB/T 30790.1, Paints and varnishes – Corrosion protection of steel structures by
protective paint systems – Part 1. General introduction (GB/T 30790.1-2014, ISO
12944-1.1998, MOD)
ISO 4628-1, Paints and varnishes – Evaluation of degradation of coatings –
Designation of quantity and size of defects, and of intensity of uniform changes in
appearance – Part 1. General introduction and designation system
ISO 4628-2, Paints and varnishes – Evaluation of degradation of coatings –
Designation of quantity and size of defects – and of intensity of uniform changes
in appearance – Part 2. Assessment of degree of blistering
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
ISO 4628-4, Paints and varnishes – Evaluation of degradation of coatings –
Designation of quantity and size of defects, and of intensity of uniform changes in
appearance – Part 4. Assessment of degree of cracking
ISO 4628-5, Paints and varnishes – Evaluation of degradation of coatings –
Designation of quantity and size of defects, and of intensity of uniform changes in
appearance – Part 5. Assessment of degree of flaking
ISO 4628-6, Paints and varnishes – Evaluation of degradation of coatings –
Designation of quantity and size of defects, and of intensity of uniform changes in
appearance – Part 6. Assessment of degree of chalking by tape method
ISO 11124-2, Preparation of steel substrates before application of paints and
related products – Specifications for metallic blast-cleaning abrasives – Part 2.
Chilled-iron grit
ISO 11126-4, Preparation of steel substrates before application of paints and
related products – Specifications for non-metallic blast-cleaning abrasives – Part
4. Coal Furnace slag
ISO 11126-5, Preparation of steel substrates before application of paints and
related products – Specifications for non-metallic blast-cleaning abrasives – Part
5. Nickel refinery slag
ISO 11126-7, Preparation of steel substrates before application of paints and
related products – Specifications for non-metallic blast-cleaning abrasives – Part
7. Fused aluminium oxide
ISO 11126-8, Preparation of steel substrates before application of paints and
related products – Specifications for non-metallic blast-cleaning abrasives – Part
8. Olivine sand
EN 10238, Automatically blast-cleaned and automatically prefabrication primed
structural steel products
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply in addition
to those defined in GB/T 30790.1.
3.1
GB/T 30790.4-2014
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 87.020
G 50
Paints and varnishes – Corrosion protection
of steel structures by protective paint systems -
Part 4. Types of surface and surface preparation
(ISO 12944-4.1998, MOD)
ISSUED ON. JULY 8, 2014
IMPLEMENTED ON. DECEMBER 1, 2014
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 4
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 8
4 General ... 10
5 Type of surface to be prepared ... 11
6 Surface preparation methods ... 12
7 Surface preparation grades ... 17
8 Surface profile (roughness) and surface profile grading ... 19
9 Assessment of prepared surfaces ... 19
10 Temporary protection of prepared surfaces from corrosion and/or
contamination ... 19
11 Preparation of temporarily or partly protected surfaces before application of
further coatings ... 20
12 Preparation of hot-dip-galvanized surfaces ... 20
13 Preparation of thermally sprayed metal (zinc and aluminium) surfaces ... 21
14 Preparation of zinc-electroplated and sherardized surfaces ... 22
15 Preparation of other coated surfaces ... 22
16 Recommendations regarding pollution and the environment ... 22
17 Health and safety ... 23
Annex A (Normative) Standard preparation grades for primary (overall)
surface preparation ... 24
Annex B (Normative) Standard preparation grades for secondary (partial)
surface preparation ... 26
Annex C (Informative) Procedures for removal of extraneous layers and
foreign matter ... 28
Annex D (Informative) Technical differences between this Part and ISO
12944-4.1998 and their reasons ... 30
Bibliography ... 33
Foreword
GB/T 30790, Paints and varnishes – Corrosion protection of steel structures by
protective...