GY 64-1989 Anti-corrosion protection coating for steel tower masts for radio and television GY64-1989 Standard download decompression password: www.bzxz.net

Standard of the Ministry of Radio, Film and Television of the People's Republic of China Anti-corrosion protective coating of radio and television steel towers
This standard applies to the anti-corrosion protective coating of radio and television steel tower guns and their components. This standard refers to the following standards:
GB470-83 Zinc ingot bZxz.net
Determination of paint film adhesion
GB1720-79
GB2694-81
Technical conditions for the manufacture of transmission line towers
GB8923--88 Rust grade and rust removal grade of steel surface before painting GB9793-88 Thermal spraying zinc and zinc alloy coating GB9794--88 Test method for thermal spraying zinc and zinc alloy coating GB9795-88 Thermal spraying aluminum and aluminum alloy coating GB9796-88 Test method for thermal spraying aluminum and aluminum alloy coating ASTMA123-84 Hot dip zinc standard for steel products 1. Coating type
Thermal spraying zinc and zinc alloy coating + sealing coating layer. 1.2 Thermal spraying aluminum and aluminum alloy coating + sealing coating layer. 1.3 Thermal clear zinc layer
3.4 ​​Hot-dip galvanizing + coating.
15 Coating
2. Coating thickness and use conditions
See Table 1
3. Surface preparation
—105—
GY64-89
3.1 Before hot-spraying zinc, aluminum and its alloys and coating, the steel surface shall be derusted according to GB9793 or GB9795.
3.1.1 The derusting grade shall not be lower than the Sa2 value specified in GB8923. 3.12 Surface roughness after derusting See Table 2.
3.2 Before hot-dip galvanizing, the steel surface should be degreased first, then aldehyde washing and rust removal should be carried out to thoroughly remove the surface oxides and rust. Issued on March 20, 1889
Implemented on March 20, 1089
Conditions of use
Industrial conversion and
Huli area
Coastal urban area
Chudao Port area
Dry port wind
Hot spraying zinc, aluminum and their alloys
scaling and rust.
4. Technical requirements for coating
Hot spray coating and
Full coating
Idle coating
GY64-89
Hot spray coating and
Alloy coating
Sealing coating
Hot spray coating
Original size (mm)
Coarse grain size Rzue
40--80
Painting coating
Purple coating
4.1 The spray coating, sealing coating and coating properties used for hot-dip galvanizing, aluminum and their alloy coatings shall comply with the provisions of GB9793GB9795.
42 Hot-dip galvanizing layer
4.2.1 The zinc ingot used for hot-dip galvanizing shall meet the requirements of Z1-2 in GB470, and the zinc content shall not be less than 99.95%.
4.2.2 The performance of hot-dip galvanizing layer shall meet the requirements of GB2694. 4.3 Galvanizing coating
The primer and topcoat of the coating must be matched and shall meet the requirements of the local environment. 4.3.1
The coating surface is not allowed to have defects such as peeling, biting, smearing, delamination, etc., and the coating is flat. 4.3.2
4.3.3 The coating is firmly bonded to the substrate and the adhesion test should be level one. 5. Inspection
GY64-89
5.1 Rust removal
5,1,1 The quality of sandblasting rust removal shall be evaluated by comparing with the typical sample photos of GB8923. The surface roughness after sandblasting rust removal shall be compared with the base sample treated by sandblasting. 5.1.2 Pickling rust removal to completely remove the oxide scale and rust on the surface of the steel. 107
5.2 Coating properties
5.2.1 The thickness and bonding properties of thermal sprayed zinc, aluminum and their alloy coatings shall be determined in accordance with GB9794 and GB9796. 5,2,2 The thickness and bonding properties of hot-dip galvanized layer shall be determined in accordance with GB2694. 5.2.3 Paint coating
5,2,3,1 The appearance of the coating shall comply with 4.3.2. 5,2,3.2 The coating thickness shall be determined by the magnetic measurement method of GB9794 or GB9796. 5.2.3.3 The coating bonding performance shall be determined in accordance with GB1720. Inspection rules
100% inspection of coating outer specifications.
For each batch of similar components, the number of sampling inspections for bonding performance is shown in 3. Move
Number of similar components between batches
.--50m
501--1200
1201-3200
3201—10000
>10000
Minimum number of missing inspections
6.3 For the sampling inspection of components, if there are any that do not meet the technical requirements of this standard, the number of sampling inspections shall be doubled. If there are still any that do not meet the requirements, they must be inspected piece by piece to determine the qualified products. Additional notes,
Drafting unit of this standard, Equipment Manufacturing Factory of the Ministry of Radio, Film and Television The main drafter of this standard, Feng Huiyi
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