Characteristics and application of 1. 1 galvanized coating
1.2 conventional cyanide zinc plating
1.2. 1 Cyanide Zinc Plating Formula and Process Conditions
1.2.2 harm of cyanide to environment and human body
1.2.3 the relationship between zinc plating and cleaner production
1.3 Types of cyanide-free zinc plating
1.3. 1 acidic potassium chloride (or sodium chloride) zinc plating
1.3.2 alkaline zincate zinc plating
1.3.3 ammonium salt zinc plating
1.3.4 sulfate zinc plating
Chapter 2 Chloride Galvanizing
2. 1 chloride zinc plating process
2.2 Process Formula of Chloride Galvanizing
2.3 Function and reasonable selection of each component in chloride zinc plating solution
Potassium chloride +0
zinc chloride
boric/boracic acid
brightener
2.4 Process conditions and control principles of chloride zinc plating
. 4. 1 pH
temperature
current density
2.5 Preparation of Chloride Zinc Plating Solution
2.6 Maintenance of Chloride Galvanizing Solution
2.6. 1 Daily maintenance of electroplating solution
Treatment of impurities
2.7 Common Faults and Solutions of Chloride Galvanizing Process
2.8 Requirements of chloride zinc plating process for equipment
Chapter 3 zincate zinc plating
3. 1 zincate zinc plating process
3. 1. 1 zincate zinc plating process characteristics
3. 1.2 zincate zinc plating process
3.2 zincate zinc plating process specification
3.3 Preparation of zincate zinc plating solution
3.3. 1 preparation principle
3.3.2 Preparation method
3.4 the role and reasonable selection of zincate zinc plating components
3.4. 1 zinc oxide
sodium hydroxide
Main additives
brightener
3.5 Operating conditions and their effects
Water tank temperature +0
current density
3.5.3 Distance and area ratio between anode and cathode
3.6 Selection of Insoluble Anodes
3.7 Tooling design of complex parts
3.7. 1 short pipe through-hole parts
3.7.2 Long tubular through-hole parts
3.7.3 Deep blind hole parts
3.8 Maintenance of Galvanizing Solution
3.8. 1 zinc-alkali ratio control
3.8.2 Control of Main Additives
3.8.3 brightener control
3.8.4 Regularly filter the electroplating solution.
Removal of carbonate
3.9 Common quality problems and solutions of zincate zinc plating
3.9. 1 zinc layer blistering and peeling
yin and yang
3.9.3 Discoloration of hydrogen removal parts
3. 10 Common faults in electroplating bath and their solutions
3. 1 1 Rejected unqualified galvanized layer
3. 1 1. 1 Stripping of Zinc Coating on Steel Matrix Parts
3. 1 1.2 Remove the zinc coating on the aluminum-based parts.
3. 1 1.3 Stripping of Zinc Coating on Elastic Parts and High Strength Steel Matrix Parts
3. 12 Equipment requirements for zincate zinc plating
3. 12. 1 electroplating bath requirements
3. 12.2 Cleaning method of galvanized wire
3. 12.3 automatic production line for linear electroplating
3. 12.4 rectifier power supply
3. 12.5 filtration equipment
Chapter 4 Sulfate Zinc Plating
4. 1 sulfate zinc plating process
4.2 Formula and Operating Conditions of Galvanizing Solution ..
4.3 Function and Reasonable Selection of Components in Plating Bath
Zinc sulfate +0
Ferrous sulfate and aluminum sulfate
boric/boracic acid
Ammonium chloride and potassium chloride
magnesium sulfate
brightener
4.4 Operating conditions and control principles of sulfate zinc plating
4.4. 1 Technical parameters of galvanized iron wire
electric current
4.4.3 pH
Liquid temperature
4.4.5 Area ratio of anode and cathode and anode placement mode
4.5 electroplating bath structure and its auxiliary equipment
4.5. 1 census
4.5.2 Structural defects of tank separation and improvement measures
4.5.3 Principles to be followed when improving plating bath and its auxiliary equipment.
4.6 Preparation of Galvanizing Solution
4.7 Maintenance of Galvanizing Solution
4.8 Common Faults and Solutions of Sulfate Galvanizing
4.9 Determination of Galvanized Iron Wire Current (I)
4.9. 1 Correctly determine the current economic significance.
4.9.2 Determination of I value of galvanized monofilament
4.9.3 Determination of I value of zinc plating for multiple iron wires
Chapter V Post-treatment of Galvanizing
5. 1 dehydrogenation treatment
5.2 light treatment
5.3 Passivation treatment
5.3. 1 formation principle of passive film
5.3.2 Passivation treatment of rainbow color
5.3.3 Army Green Passivation Treatment
5.3.4 White and blue-white passivation treatment
Black passivation
Passivation of pentavalent chromium
5.4 Coloring and Dyeing Treatment
5.4. 1 Coloring treatment of galvanized layer
5.4.2 Dyeing treatment of galvanized layer
Chapter VI Zinc-based Alloy Electroplating
6. 1 Zn-Ni alloy electroplating
6. 1. 1 chloride zinc-nickel alloy electroplating
6. 1.2 sulfate zinc-nickel alloy electroplating
6 1.3 Zinc-Nickel Sulfate Chloride Electroplating
6. 1.4 electroplating of alkaline zincate and other zinc-nickel alloys
6. 1.5 Passivation of Zn-Ni alloy
6.2 Zn-Fe alloy electroplating
6.2. 1 sulfate zinc-iron alloy electroplating
6.2.2 Chloride galvanized iron alloy
6.2.3 Alkaline galvanized iron alloy
6.2.4 Zn-Fe alloy passivation process
6.2.5 Application of Zn-Fe alloy electroplating
6.3 Development prospect of zinc-based alloy electroplating
Chapter VII Chemical Analysis of Galvanizing Solution
7. Analysis of1potassium chloride zinc plating solution
7. Determination of1.1zinc chloride
7. 1.2 determination of potassium chloride
7. 1.3 determination of boric acid
7.2 Analysis of zincate zinc plating solution
7.2. Determination of1zinc oxide
7.2.2 Determination of sodium hydroxide
7.3 Analysis of Sulfate Zinc Plating Solution
7.3. 1 Determination of zinc
Determination of aluminum
7.3.3 Joint determination of zinc and aluminum
Determination of iron
7.4 Analysis of Zinc-based Alloy Electroplating Solution
7.4. 1 analysis of acidic zinc-nickel alloy solution
7.4.2 Analysis of Alkaline Zn-Ni Alloy Plating Solution
7.4.3 Analysis of Zn-Fe alloy electroplating solution
7.5 Analysis of Passivation Solution
7.5. 1 Continuous determination of nitric acid, chromic anhydride and trivalent chromium
Determination of sulfuric acid
Determination of manganese
7.5.4 Rapid Analysis of Passivation (Color) Solution with Low Chromium Acid
7.6 reagent preparation
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