This standard specifies the composition, representation and requirements of the classification codes and markings of metal coatings and chemical treatments for relays and their devices. This standard applies to electroplating, chemical plating and chemical treatments on metal and non-metal parts of relays and relay protection devices. This standard also applies to automatic monitoring devices for power system safety and similar products. When there are special requirements for metal coatings and chemical treatments that are not specified in this standard, they should be specified in relevant technical documents or enterprise standards. JB/T 7101-1993 Classification code markings for metal coatings and chemical treatments for relays and their devices JB/T7101-1993 Standard download decompression password: www.bzxz.net

JB/T7101-1993
Classification code and marking of metal plating and chemical treatment of relays and their devices
Mechanical industry standard of the People's Republic of China
Classification code and marking of metal plating and chemical treatment of relays and their devices
Subject content and scope of application
JB/T7101-1993
This standard specifies the composition, expression method and requirements of the classification code and marking of metal plating and chemical treatment of relays and their devices. This standard applies to electroplating, chemical plating and chemical treatment on metal and non-metal products of relays and power protection devices. This standard also applies to automatic monitoring devices for power system safety and similar products. If there are special requirements for metal plating and chemical treatment, which are not specified in this standard, they should be specified in relevant technical documents or enterprise standards.
2 Reference standards
GB1238
GB3138
3 Terms
Methods for expressing metal coatings and chemical treatments
Common terms and terms for electroplating
Terms used in this standard are in accordance with the provisions of GB3138. 4 Classification of coatings and chemical treatments
4.1 According to different plating and treatment methods, it is divided into: a. Electrochemical plating of metals and non-metals: b. Chemical plating of metals and non-metals:
c. Chemical treatment of metals and non-metals.
4.2 According to different uses, it is divided into:
a, protective plating or chemical treatment: used to prevent metal parts from corroding under different environmental conditions: b. Protective decorative plating or chemical treatment: used for parts that need to be decorated, and also to prevent metal parts from corroding under different environmental conditions;
c. Special plating or chemical treatment: used to give certain characteristics to the surface of parts. For example, silver plating is used to improve the conductivity of the surface of parts, hard chrome plating is used to improve the hardness and wear resistance of the surface of parts, and local copper plating is used to prevent carburization, etc. 5. Composition of the classification code and marking of the coating and chemical treatment. The marking of the coating and chemical treatment consists of three parts, and each part is connected by a dot ",". The order of arrangement is as follows: a. Marking of coating
Approved by the Ministry of Machinery Industry on October 8, 1993
Implemented on January 1, 1994
b. Composition of chemical treatment marking
JB/T7101—1993
Classification and marking method of plating and chemical treatment 6
Post-treatment
Coating thickness
Coating name
Coating characteristics
Plating method
Post-treatment
Treatment name
Treatment characteristics
Treatment method
Plating method, treatment method, coating characteristics, treatment characteristics, treatment name and post-treatment are all expressed in Chinese pinyin, and the coating name is expressed in 6.1
element symbols, see Table 1 and Table 3.
Electroplating, electrochemical treatment
Chemical plating
Chemical treatment
Full bright
Semi bright
Black (nickel, chromium)
Symbols for plating methods and treatment methods
Used Sinology and Chinese Pinyin
Chinese Pinyin
Table 2 Symbols for plating characteristics and treatment characteristics
Used Chinese characters and Chinese Pinyin| |tt||No Pinyin
Symbols
Symbols
Chromate Sealing
JB/T7101—1993
Treatment Name and Post-treatment Symbols
Chinese Characters and Pinyin
Pinyin
GeFcng
The coating thickness is expressed in numbers, in microns, and the value is the lower limit of the thickness range. a.
If necessary, the coating thickness range can be marked; if the coating thickness is otherwise specified in the enterprise standard, it may not be marked. b.
Example:
Chemical nickel plating 3~5μm
Electroplating dark nickel 7~10m (thickness range needs to be marked)Electroplating 60% tin-lead containing gold 15~20μm6.3 Color representation method
H·Ni3
D ?Ni7~10
D·60SnPb15
Common colors of passivation and oxidation after electroplating are represented by Chinese phonetic letters, see Table 4.
Example:
Electrogalvanizing 15~20μm and then passivated into rainbow colors Table 4
Methods for expressing multi-layer coatings
D·Zn15·DC
Symbols for commonly used colors
Chinese characters and pinyin adopted
Pinyin
The name of the coating should be marked with the name and thickness of each layer in the order of coating, and the layers should be separated by slashes "". Example:
Multi-layer full bright chrome plating with copper and nickel as the middle layer 25~30μm
D·L3Cu15/Ni10/Cr25
Symbols adopted
Symbols adopted
If there are enterprise standards or technical documents that make corresponding provisions for the middle layer of multi-layer coatings, only the name and total thickness of the last coating can be marked, and parentheses are added to the coating name to distinguish it from the single-layer coating. Example: Multi-layer bright chrome plating 25~30μm
Symbols for preparation process or independent finishing treatment 6.5
DL2(Cr)25
6.5.1 When the preparation process is used as an independent finishing treatment, it shall be represented by the symbols specified in Table 5. 419
Example:
Chemical degreasing
Organic solvent degreasing
Electrolytic degreasing
Chemical degreasing
Chemical pickling
Electrochemical polishing
Chemical polishing
Mechanical polishing
JB/T7101-1993
Symbols for preparation procedures
Chinese characters and pinyin used
Pinyin
RongChu
DianChu
HuaChu
HuaSuan
DianPao
HuaPao
PenSha
GunGuang
MuoGuang
Shua Guang
Use symbols
6.5.2 The preparation process should not appear in the representation method. If it must be represented at the same time as the plating, it should be separated by a slash "". Example:
Sandblasting and electroplating zinc 7~10μm
PS/D?Zn7
Fastener electroplating can be simplified, that is, the coating method symbol "D" and the rainbow color symbol after electroplating are omitted in the marking.6
No. "c".
Example:
Fasteners are electroplated with zinc for 12~15μm and then passivated into rainbow colors. Common metal coatings and chemical treatment methods
Zn12·D
Common metal coatings and chemical treatment methods are shown in Appendix A. For special requirements, refer to GB1238. 420
Categories of plating and treatment methods
Chemical oxidation of steel
Electrogalvanizing
Purification of electrogalvanizing to rainbow colors
Passivation of electrogalvanizing to white
Oxidation to black after electroplating
Chemical phosphating of pots
Electrocopper plating
Chemical oxidation of pots and copper alloys
Bright chemical oxidation of copper and copper alloys
Chemical passivation of copper and pot alloys
Electrochemical cyaniding of steel and copper alloys
Bright electrochemical oxidation of copper and copper alloys
Electronickel plating
Semi-bright electronickel plating
Bright electronickel plating
Multilayer electronickel plating
Multilayer semi-bright electric lock nickel
Multilayer bright electro-nickel
Electroplating black nickel
Multilayer electroplating chrome
Multilayer full-bright electroplating chrome
Multilayer bright electroplating chrome
Multilayer semi-bright electroplating chrome
Electroplating hard chrome
Electroplating cream chrome
Electroplating tin
JB/T71011993
Appendix A
List of commonly used metal coatings and chemical treatment representation methods (supplement)
Representation method
D·Zn·DC
D·Zn·DB
D·Zn·YH
D· Cu
H·L2Y
D·L2Y
D·Ni
D·LINi
D· L2Ni
D? Cu/Ni
D - L1Cu/Ni
D? Cr
D · L3Cu/Ni/Cr
D · L3Ni/Cr
D · L2Cu/Ni/Cr
D · L2Ni/Cr
D ·LICu/Ni/Cr
D ? LINivCr | |tt | | L(Cr)
D·Cu/NiCr and other representation methods
Applicable to (referring to the bottom gold vortex)
D·Ni/Cr and other representation methods are applicable
Applicable to copper and steel alloys
Types of plating and treatment methods
Multi-layer electroplating tin
Multi-layer electroplating tin-lead alloy
Electroplating silver
Full bright electroplating silver
Multi-layer electroplating gold
Multi-layer electroplating hard gold
Chemical oxidation of aluminum and aluminum alloys
Electrochemical oxidation of aluminum and aluminum alloys
Electrochemical oxidation of aluminum and aluminum alloys
Chromate sealing after oxidation
Coloring after chemical oxidation of aluminum and aluminum alloys
Insulation of aluminum and aluminum alloys Electrochemical oxidation
Degreasing with organic solvents
Electrolytic degreasingWww.bzxZ.net
Chemical degreasing
Chemical pickling
Pickling passivation
Mechanical polishing
Chemical polishing
Electrochemical polishing
Note: The simplified scheme in the table is the recommended scheme. Additional Notes:
JB/T71011993
Continued Table A1
Method of Expression
D·Cu/Sn
D·Cu/60SnPb
D·L3Ag
D·CwAu
D·Au/Au
D·YCu/Au
D·YAg/Au
D·Y·GF
D·Y·Z
D·J·Y
This standard is proposed and managed by Xuchang Relay Research Institute of the Ministry of Machinery Industry. This standard is drafted by Xuchang Relay Products Research Institute of the Ministry of Machinery Industry. The main drafter of this standard is Ouyang Kun.
Simplified scheme
D· (SnPb)
D· (Au)
D·Y(Au)
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