Thank you all for positive feedback.
My cost for anodizing was $25, their minimum rate, which included stripping of the previous anodized layer on flat plates from the 8020.net. This shop is doing anodizing only so they don’t have to deal with heavy metals like chromium, nickel or copper.
As I wrote “I love anodizing finish”, so here is a little story.
What is common between a watch and anodizing?
- A quick answer is – Apple, their watches are sold in anodized aluminum frame or stainless, one even with a diamond coating, that is the answer of the 21st Century.
- The long answer is a little deeper. But the background of anodizing is necessary to understand this second answer. Anodizing is the electrochemical process of coating aluminum with a thin layer of vertically oriented hexagonal crystals of aluminum oxide. Aluminum parts are immersed in a sulfuric acid bath, connected as an anode (+), and stainless steel as a cathode (-). Parts are finish when aluminum oxide covers all aluminum surface (voltage rise), rinsed, dyed or not, an sealed in hot water.
In short, that coating is a hard layer of material which as a mineral is called Corundum, if red it is called ruby or if blue it is called sapphire. Clean corundum is colorless but contaminated with chromium it becomes ruby and with iron and titanium - sapphire. In short, anodizing build a crystal layer from which rubies come from.
Back to common aspect with a watch, do you remember times when a quality of watches was measured by a number of Jewels, 21 was good but 25 was even better. These jewels were used as bearings made from rubies for rotating shafts, or other high wearing parts - more good bearings meant higher quality.
So the common between anodizing and watches is material of very hexagonal crystals of aluminum oxide. This is the answer of the past Century and of the end days of this remarkable technology.