Alkaline Oxidation （phosphatizing）Processing Code
1、Applicable scope
Provisions of this standard we ud alkaline oxidation (black) treatment process code
2、Glossary
2.1 Oxidation treatment
By chemical or electrolytic methods, the steel surface in a certain media has a certain degree of corrosion resistance and surface aesthetics treatment.
2.2 Alkaline oxidation process (phosphatizing)
Heated to the temperature of the steel workpiece oxidation in alkaline solution, often called black.
2.3 Effective heated zone
Furnace temperature uniformity with heat treatment requirements of loading area.Effective
heated zone determined according to GB9452-2012游泳的坏处 of the heat treatmentfurnace efficient heating method.
2.4 Temperature uniformity
二面黄
Under normal operating conditions and rated temperatures, heat-stable state, at the same time at the required temperature in the region, the deviation between thehighest and lowest values of the temperature.
3、Items to be black
3.1 Black-material
Blackened pieces of the material, its chemical 澳门一日游composition should comply with therelevant national standards, standards or industrial standards requirements
3.2 Status blackened pieces of the original data
For items to be black, original data to be included
(1) Material code name or chemical composition
(2) Black supply (castings, forgings, bars and mi-finished products or finished products)
(3) Blackening treatment by State (normalizing, annealing, quenching + tempering)
3.3 Black appearance, shape and size
3.3.1Appearance of the workpiece does not allow crack and affect the quality of heat treatment of corrosion, oxidation and scratches
3.3.2 Part diagrams or assignment, indicate the main dimensions, can accurately reflect the shape of the workpiece. Dimensions can also be obtained through
4、Blackening treatment process equipment
4.1 Black tank
4.1.1 Black tank temperature deviation shall not exceed ± 5 ° c and the temperature can be adjusted
4.1.2 Black ratio to meet the requirements of the solution, and can be adjusted
4.2 Sink
4.2.1 Water in the water tank with tap water
4.2.2 Water tank in the water should be ud in a flow state
4.3 Temperature measurement and temperature control equipment
4.3.1Blackening the u of heating equipment shallbe equipped with a temperature measurement and temperature control device, each heated area in the heating equipment should be equipped with track temperatures and time of recording devices
4.3.2 Thermoelectric temperature measurement equipment after calibration, the indicator, the total error of the temperature梦幻西游手游月宫 reading on the indicator at a predetermined temperature 400 ℃ ≤ ± 4 degrees, at a predetermined temperature > 400 t/c ≤黑加仑葡萄干的功效与作用 ±100 ℃, t is a pret temperature
4.4 Equipment maintenance
In order to ensure the accuracy and performance of the equipment shall be subject to heat treatment system of equipment operation and maintenance, and saves the record. Temperature measurement and temperature control equipment shall comply with the relevant provisions of the instrument room quality
5、Code of blackening treatment process
5.1 Getting ready for a black
5.1.1 Examining and understanding the treat black artifacts, and have access to the process documents
(1) Understanding of blackening quality requirements
(2) Understand the chemical composition of steel grades or, prior heat treatment
5.1.2 Check the appearance quality of black
(1) Black front workpiece安徽高考作文 surface roughness of the best below the 0.8 μ m
(2)Check for scale, surface rust, grea. Rust should first Polish, then wash it with petrol, no rust spots can be cleaned directly. Wipe dry with a clean cotton or cloth after cleaning. Blackening treatment should be carried out in 1~~2hr, the shorter the residence time in the Middle as possible
(3) Check the surface, does not allow scratches, cracks, sharp corners and burrs. If necessary, inspection
5.1.3 Workpiece binding
In order to ensure that can generate a uniform layer of oxide film on the surface of the workpiece. Banding artifacts should be made when there is a gap between the workpiece, workpiece contact is strictly prohibited. Not lashing, hamper when you want, point contact between the workpiece as possible.
5.1.4Oil blackening the workpiece surface mustnot have oil, 家家网购grea should be cleanedbefore processing to the oil. The pickling preparation and oxidation.
Under a common Degrear such as distribution, reference for the u of
(1) 10~~15g/lNaCO3 solution, working temperature: 100 ℃, time 15~~20min
(2) 100gNaOH+30gNaCO3+30gNaPO4.12H2O/solution, working temperature: 艾拉公主100 ℃,time 10~~30min
