This article describes the species and variety of stainless steel surface treatment methods , and analyzes the advantages and disadvantages of various treatment methods . Thus revealed to the people of stainless steel processed products which method should be used in order to achieve the purpose of surface finishing of stainless steel , stainless steel can open up prospects for the use and value to the market
( A ) Introduction:
We all know that stainless steel has its unique strength and high abrasion resistance and excellent corrosion resistance does not rust and other excellent features. It is widely used in chemical industry , food machinery , mechanical and electrical industry , household appliances industry . Currently a lot of finishing into the home decor industry , to give people a beautiful and noble feeling.
Application development prospects of stainless steel will be more extensive, but the stainless steel applications development largely determines the extent of its surface treatment technology . Let me talk about the condition of the stainless steel surface treatment technology for discussion .
(Ii ) stainless steel varieties Description:
Stainless steel generally contains chromium (CR), a nickel (NI), molybdenum (MO), titanium (TI) and other high quality metal element. Common stainless chromium steel , which contains CR> = 12% or more . Nickel- chromium stainless steel with CR> = 18%, including NI> = 12%. Results from the stainless steel material microstructure Category: austenitic stainless steel , for example : 1CR 18 NI9TI, 1CR18NI11NB, CR18MN8NI5. Martensitic stainless steels such as : CR17, CR28 and the like. Commonly referred to as non-magnetic stainless steel and with a magnetic stainless steel.
(C ) surface treatment of stainless steel varieties :
Currently on the stainless steel surface processing varieties ( 1 ) Surface color bleaching treatment . ( 2 ) the surface of the mirror Shiguang Liang treatment . ( 3 ) the surface shading .
1, stainless steel in the process , through the coil, bar edges , welding or surface fire Attn side temperature processing , producing a black oxide . This hard gray and black oxide is mainly NICR2O4 and NIF two bell EO4 ingredients, before the general use of highly corrosive hydrofluoric acid and nitric acid method removed. However, this method costs a large , polluting the environment, harmful. Corrosion larger gradually be eliminated.
There are two kinds of such scale approach: ( 1 ) the use of spray ( pill ) sand approach . ( 2 ) chemical method .
That the use of a bell pollution pickling and passivation paste and non-toxic cleaning solution at room temperature with inorganic additives were immersion. So as to achieve the purpose of whitening qualities of stainless steel . Appears to be a substantially eye color. This method of large-scale , complex products more applicable , should be widely applied .
2 , mirror-bright stainless steel surface treatment:
Stainless steel products according to user requirements and the complexity of the situation is different respectively by mechanical polishing, chemical polishing , electrochemical polishing and other methods to achieve the mirror Dan Guangze . Here I introduced the advantages and disadvantages of these three methods chosen for your reference :
Table 1
Project
Method
Advantage
Shortcoming
Applicable Products
Remark
Mechanical polishing
Leveling is good, bright
Table 1
Project
Method
Advantage
Shortcoming
Applicable Products
Remark
Mechanical polishing
Leveling is good, bright
Labor-intensive , serious pollution, difficult to machine complex parts , gloss drop , higher investment and costs
Simple piece , medium and small , complex parts can not be processed .
Light Zeda less consistent throughout the product , gloss retention time is not long
Chemical polishing
Less investment , complex parts can throw, high efficiency , fast
Insufficient brightness , polishing liquid to wet, gas spill , require proper ventilation equipment .
Complex products , the brightness can be used for less demanding products
Small batch processing than the cost-effective.
Electrochemical polishing
Of specular gloss , long-term , process stability , low pollution , low cost , pollution prevention and good .
A one-time investment, complex parts to be installed tooling, auxiliary electrode , mass production to lower the temperature
Dirty block products , requiring long time to keep the mirror light, bright products.
Process is stable , easy to operate , can be widely use
3 colored stainless steel products confers not only a variety of colors , variety of products, and improve product wear and abrasion possibilities.
Stainless coloring method the following categories: ( 1 ) plasma deposition oxide or oxides. ( 2 ) high-temperature oxidation.
( 3 ) chemical oxidation. Electrochemical oxidation. ( 4 ) the gas phase pyrolysis method.
Brief overview of the various methods are as follows :
( 1 ) oxide or oxide ion deposition method , the workpiece is placed in a stainless steel vacuum coating machine for vacuum evaporation plating : For example : titanium gold watch cases and watch bands. Usually gold . This method is suitable for high-volume processing . Because investment , high cost , low-volume products uneconomical.
( 2 ) High temperature oxidation of the molten salt in particular , the workpiece is immersed in a process to maintain the range of the workpiece to form a certain thickness of the oxide film , and present a variety of different color.
( 3 ) chemical law is in a particular solution, the color film is formed by chemical oxidation , and generally have " due to Law" use more, but to be able to ensure consistent color batch , they must be controlled with reference telegram .
( 4 ) an electrochemical method , is the specific solution, the color of the film formed by oxidation, obtained in the commercial applications.
( 5 ) gas-phase pyrolysis method, is more complex, less application in industry .
(Iv ) Description :
This paper briefly describes the stainless steel surface treatment methods , specific product requirements and choice of which method to apply treatment . According to product mix materials , materials, and different requirements on the surface . Choose to develop a workable program of work to implement . Since the formulation process approach is that some trade secrets , where Andrew is not easy to write , the reader understanding.
(E ) Discussion:
Due to my limited level , there are many failed to make it clear that , to be discussed please . Such as various stainless steel
Are mirror polishing effect reached Dan Guangze ? Whether the coloring to achieve consistency ? Further study experimental analysis, the more complete formulation process for the production of stable choice .
