Non-cyanide converting method for cyanide plated zinc
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A technology of cyanide and zinc oxide, applied in the field of electrolysis or electrophoresis on metal surface to produce coating, can solve problems such as affecting the quality of electroplating, scrapping of electroplating bath, difficult to remove, etc., achieving obvious environmental benefits, strong resistance to impurities, environmental protection small effect
Inactive Publication Date: 2010-02-10
DALIAN MARITIME UNIVERSITY
View PDF0 Cites 4 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
However, there is a problem in the practical application of this method, that is, the CN - Complexed Pb 2+ , Fe 3+ 、Cu 2+ A large number of impurity ions are precipitated, which is difficult to remove by electrolysis, which seriously affects the quality of electroplating, and even causes the electroplating bath to be scrapped.
In addition, there are incompatibility problems between the added additives and the original additives
[0005] At present, there is no report on a cyanide-free conversion galvanizing process that is effective and can ensure good coating quality and high electrical efficiency.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0051] Cyanide plating conditions:
[0052] Cyanide content g·L -1 10
[0053] Zinc oxide content g·L -1 10~15
[0054] NaOH contentg·L -1 60~100
[0055] Complexing agent HEDP ml·L -1 15~20
[0056] Brightener HT ml·L -1 2~3
[0057] Temperature ℃ 15~45
[0058] Cathode current density A·dm -2 1~4
[0059] The average current efficiency of electroplating is 70%.
Embodiment 2
[0061] Cyanide plating conditions:
[0062] Cyanide content g·L -1 10~5
[0063] Zinc oxide content g·L -1 8~12
[0064] NaOH contentg·L -1 80~120
[0065] Complexing agent HEDP ml·L -1 15~20
[0066] Brightener HT ml·L -1 2~3
[0067] Temperature ℃ 15~45
[0068] Cathode current density A·dm -2 1~4
[0069] The average current efficiency of electroplating is 75%.
Embodiment 3
[0071] Cyanide plating conditions:
[0072] Cyanide content g·L -1 <5
[0073] Zinc oxide content g·L -1 10~12
[0074] NaOH contentg·L -1 100~120
[0075] Complexing agent HEDP ml·L -1 15~20
[0076] Brightener HT ml·L -1 2~3
[0077] Temperature ℃ 15~45
[0078] Cathode current density A·dm -2 0.5~4
[0079] The average current efficiency of electroplating is 78%.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
PUM
Login to view more
Abstract
The invention relates to a non-cyanide converting method for cyanide plated zinc. Non-cyanide conversion is as follows: a brightening agent (HT) and a complexing agent (HEDP) are added into plating liquid to carry out zinc plating by stopping adding NaCN and ZnO into the plating liquid. The plating liquid comprises the following components (g*L-1): 10-less than 5 of cyanide, 8-15 of zinc oxide, 60-120 of NaOH, 15-20 of HEDP and 2-3 of HT. The electroplating technical condition comprises the temperature of 10-45 DEG C, the cathode current density (A*dm<-2>) of 0.5-4 and the average current efficiency of 70-78 percent. The corrosion resistance, the bonding capability and the color change resistance of a plating layer completely meet the practical production requirement. The plating liquid has high impurity resistance and is still stable for continuously using for one month. The converted process does not use the cyanide, is easy to process electroplating wastewater and is a more clean production process, thereby replacing a cyanide zinc plating process in a peace way.
Description
technical field [0001] The invention belongs to the technical field of electrolysis or electrophoresis to produce a coating on a metal surface, and in particular relates to the electrogalvanizing technology of a zinc solution containing cyanide. Background technique [0002] The cyanide galvanizing process has been used for hundreds of years. Although it is a mature process, it also has the defect that improper management and disposal of sodium cyanide will cause great harm to human life and the living environment. The National Development and Reform Commission clearly proposed to eliminate the cyanide galvanizing process in Article 15 of the third category of elimination in the "Industrial Structure Adjustment Guidance Catalogue". Therefore, the electroplating industry is faced with the choice of directly abandoning the cyanide galvanizing process and transforming the cyanide galvanizing process. However, the cost of directly discarding the cyanide plating solution to prep...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to view more 
Login to view more