Hi guys this is my first experimental Instructables and I am not often doing this kind of stuff. The thing I like about this is that it took the stainless-steel articles to a whole new level. Although it's not constrained to stainless steel, you can use this process on any type of steel and I found that hardened surface holds these colours much better. The principle is very basic, when you heat the steel at a certain temperature it changes colour and that colour comes due to the reaction of the top layer with oxygen. Now, these colours are definitely not that much robust like painted surface or like anodizing but if you used them onto the place where constant rubbing action didn't take place over that area it's completely ideal. I am using this technique nowadays on many stainless projects and this technique definitely took them to a whole new level. There are definitely a few things which you need to consider while doing this colouring technique which I am going to discuss in this instructable. Now if you take a look at the steel heating chart before it gets to red heat, it passes through many different colours stages. Some of them can be kept permanent while most of the higher degree heat remain temporarily and once the metal cools down it converts to black, which we don't want. Some of you might think that in stainless steel it deteriorates the top layer and stainless no longer remain protected but I didn't find any problems in that if the steel is 304 grade. During this Instructables 3 different techniques, I am going to share and all of them include heat but different material to change the colour. There are definitely many more chemical ways to do this colouring but they are a bit difficult to do. If you have any other method then definitely let me know.
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Once the cleaning is done I made the setup and start the heating process. Now if you take a look onto the heat chart then color up to 330° C is achievable and more than that starts to deteriorate the surface finish. Now in the spectrum, there are a bunch of different colors and if you start heating them and constantly heating the surface then it starts to show you all the colors are shown in that chart.
An important thing that needs to be considered here is the property of steel. Steel has a very low thermal conductivity which means that if you heat a particular area it will not able to distribute heat to the surface evenly through the metal, which leads to irregular color grade. Now point here to consider is that make sure to move the torch constantly through the process so that heat will not concentrate on a particular area. Also if you want a pale straw color then make sure that before getting that color pause the heat for few seconds and the reason for doing this is that heat took some time to spread evenly inside steel, so if you wait for a while then the heat spread evenly and you didn't even need to apply more heat to the metal. But on the other way if you kept on doing that then you will surely overshoot the temperature and gets a different shade.
In this particular video, I played with only two colors,s and the reason for choosing them is because they are quite easy to get, and judging those colors during the heat is also very easy. The key to success here is to go slow and steady and spread the heat evenly.
The third method in this list is brass deposition. Now for this method, you need a wire wheel which made out of pure brass, only those type of bristles can be used for colouring steel. One thing you need to keep in mind that if your finish is high gloss then it will turn into a matte finish. So the process is like you need to heat the metal and once it's reached to light pale color start rubbing the brass wheel onto the surface. I hold the brass wheel into a drill and start rubbing onto the final. During this process, I fix the torch and hold the piece into a locking plier so that it's able to bear the force. After a few rubbing, the workpiece is ready to use.
Regarding color stainless steel, is your first impression still that it only comes in one color? For example, stainless steel dishes and dishes, or is it the impression that stainless steel can only appear in heavy industry applications? But in fact, stainless steel can be seen everywhere in my mother’s life, such as the bronze doors of hotels, such as rose gold screens in home decoration, such as landscape basins in some courtyards… So the question is, how to achieve such colors of stainless steel Various, the editor will tell you about the coloring treatment of stainless steel colored plates.
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This method of coloring stainless steel is to put the stainless steel into a vacuum coating machine for vacuum evaporation. This method is suitable for processing large quantities of products. Because of the large investment and high cost, small-batch products are not cost-effective.
After the stainless steel is surface oxidized and colored in a special chemical coloring solution, it appears in various colors. This is not caused by the coloring of the surface coating but by the interference of light.
According to the principle of stainless steel coloring, it can be known that color changes on the surface of stainless steel are caused by changes in the composition of the surface oxide film. Therefore, no matter which stainless steel coloring method is used, attention must be paid to the control of time and potential.
The color is not just on the surface but is created by the interference of light with oxide films of varying thickness. These films change the way light reflects off the surface, creating shades such as gold, blue, black ,and rose.
Tip: Regardless of the method used, precise control of time, temperature,e and potential is key to achieving consistent coloring results.
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