A Few Steps to Operate Black Steel Pipe?

Here are a few steps to teach you how to operate black steel pipe. Black phosphate mainly refers to the middle temperature phosphate black, it's called special phosphate solution, this process requires heating to about 55℃, it is applicable to cast iron, carbon steel, high carbon steel and other materials, and it's easy to operate, can get a black or dark gray phosphate coating. Black nickel plating, it is suitable for direct nickel plating on stainless steel, nickel plating, etc. it's also applies to direct nickel-plated aluminum, aluminum alloy, this process is very popular in the market currently. Now the most commonly used black technique in the market is actually two kinds: alkaline black and room temperature black, traditional black. This traditional steel black is dong in the basic solution under 135-150℃, processing time is up to 1-1.5 hours, it's high energy consumption, low efficiency and heavy pollution. At present, many companies are already switching to the now popular normal temperature steel blackening agent, it is not only black good quality, no pollution, and very energy-efficient, greatly improves the efficiency of enterprises, and it makes up for the deficiencies of traditional black. There is also a kind of steam black; it is more suitable for metallurgical products.

Normal temperature blackening mechanism is no consensus currently, because the black membrane is thin, usually no more than 3μm, use X-ray diffract meter and scanning electron microscope to analysis, normal temperature blackening film composition is not as alkaline black membrane Fe3O4, but its film layer components are more complex, it is difficult to make accurate judgments. The main technical indicators are: blackening agent is blue liquid, it's no mechanical impurities, odorless, non-flammable, non-explosive, and non-corrosive, transport safety, its PH value is 2-2.5, the density is 1.04, and water insoluble matter is less than 1%. Its performance indicators are as follows: reference standards promulgated by the Ministry of Ordnance WJ535-82 <steel parts alkaline chemical oxidation technology>. After the black, the test results: 1. Experiment with 3% copper sulfate drip, discolored time is less than 32 seconds under 15-20℃. 2. Immersed it in the 3% sodium hydroxide aqueous solution for 2 hours will meet the standards.

The use methods: Framing�'Degreasing(5-10mins)�'Water rinsing(1min)�'Rinsing(0.5min)�'Derusting(1-5mins)�'Water rinsing(1min)�'Rinsing(0.5min)�'GT-FH802 normal temperature blackening(2-6mins)�'Water rinsing(1min)�'Stabilizing(0.5-1min)�'Immersing GT-FX238 rust oil dehydration(3-5mins) or GT-FB806 waterborne sealers(1min)�'Drying or drying under 80-90℃(10-20mins). Pretreatment process including degreasing and rust-activated two processes, this is the key to black successfully in normal temperature, the general requirement is that the process black steel pipe should be degreased and rust thoroughly, only then can we get good black membrane. The circuit is: Medium temperature oil removing�'Water rinsing�'Rinsing�'Derusting activation in normal temperature, light rust machined parts can use hydrochloric acid(the rate of industrial hydrochloric acid and water is 1:1), acid pickling 1-5mins, oxide scale thicker parts, can be derusted in 180-250g/l heated sulfuric acid�'Water rinsing�'Rinsing�'GT-FH802 normal temperature blackening(this process is suitable for little oil, no thick Oxide scale parts, the processing time of each process in place, stable quality and low cost.). After learning the steps to operate the black steel pipe, you can use it correctly!

The welded steel pipe and API steel pipe are also available.