protection from rust and corrosion needs each metal, including aluminum, which is very often used by laymen in the home.If on the aluminum surface to create a dense and thick oxide film, this would be sufficient to inhibit further corrosion that is produced in the process of anodizing aluminum.Most mechanically strong and resistant film obtained by low-temperature thin-layer anodized aluminum, and what you will do.
- Manufacturing electrolyte
- processing modes
- Bath anodizing
- anodizing process
spend quality anodizing at home - simple.Safer and more convenient to engage in this work on the street or balcony.In the process, you will find some dangerous health points.
acid is very corrosive thing.Although it is located in a highly diluted form and is in contact with the skin it is only a faint itching, but if it gets into your eyes - can cause serious injury!Because it is desirable in the an
During the procedure, the anodizing is performed at the anode isolation of oxygen, and the cathode - hydrogen.After mixing of these gases are known to form detonating gas, which in principle is the same as dynamite.Therefore, anodizing indoors can be killed by the first spark.
aware that the items after anodizing are larger in size.The thickness of the protective layer of the anode is typically 0.05 millimeters.For example, a thread that tightly curled before, after anodizing process in general cease to twist as a bolt in the nut in this case would be closer to 0.2 millimeters.A polish anodized almost impossible.
useful to polish the product to a mirror finish to the polishing circle.So much win aesthetics parts and reduce the likelihood in anodising "burnout."Incidentally, the anode layer does not mask the surface defects - and they will be visible on the treated article.
Prior to electroplating of aluminum should be well degreased.It is not necessary to keep the metal in hot sodium hydroxide or potassium, as recommended in the industrial technology because much spoils the purity of the surface.It is better to use a piece of soap and a toothbrush, because you work with small details.First wash the product in warm water, then in cold.
Very efficient detergent effect: it must be dissolved in hot water in a plastic container.Then there should pour product shake well and pot.After washing, thoroughly dry the parts with hot air.Do not worry about the small traces of oil: after degreasing product in hand, you can take, because the layer of fat from the fingers instantly oxidized by oxygen.
anodizing electrolyte in the home serves as a solution in distilled water, sulfuric acid.It can be used an ordinary tap water, but if can take distilled - it is best to choose, as in the first case somewhat spoils the uniformity of the process - the distribution on the workpiece surface current density.
Sulfuric acid is stupid to do yourself, but distilled water - very easy!If it's no snow or rain, the ice in the freezer is always there.Get distilled water and sulfuric acid can be at a local auto shop parts, because these ingredients are used to service the vehicle's battery.However, there
sold acid diluted to a density of 1.27 grams per cubic centimeter, entitled "Electrolyte for lead batteries."You need to mix the electrolyte with distilled water at a ratio of 1: 1.
If you take a standard 5-liter canister with the electrolyte and the same amount of water, the result you get 10 liters of solution for anodizing.That's enough for small parts and for large cost double that amount.
Remember that when mixed with water, acid will produce a lot of heat.If you pour water into acid, it instantly boil, splashing in the face!That is why it is recommended to pour the electrolyte in a container of water in a thin stream, stirring continuously with a glass rod.And it is better to wear protective goggles!If you get acid on your skin or clothing should be immediately rinse it with water jet and rinse with a solution of baking soda.
metal anodizing process temperature is -10 - +10 degrees Celsius.Growing layer below -10 is quite good, but not enough voltage, which is issued by the power supply, to maintain the required amperage.Above 10 degrees, though the protective film will be formed, but it will turn out shaky and colorless.
However, it is recommended to stop the process of anodizing even at 5 degrees above zero.And the thing is, in the corner of the bath and on the workpiece surface is observed different temperatures and for anodizing a lot of energy is released as heat.
But if not provided with forced mixing elektrolita, you can not believe the thermometer!However, the electrolyte should be stirred constantly with a spoon, the air pump, it is necessary to equalize the temperature on the surface of aluminum products.Other parts are formed in the hot spots, and then - and breakdowns rastrav details.
anodic current density must be within 1.6 - 4 amps per square decimeter.In such a range will grow beautiful, colored and tight protective anode layer.Best of all doderzhivatsya current density of 2 to 2.2 Ampere / dm 2.With less amperage coverage will grow slowly not thick.In larger amperage than 4 Ampere / dm 2 may be an electrical breakdown, and the product will be quickly rastravlivatsya.
cathodic current density should be low.The lower the score, the better, because it provides uniform and soft mode current density distribution over the surface of the workpiece, especially if it is large.Therefore, note that the area of the cathode lead should be twice the area parts (anode).
process of anodizing aluminum profile does not specify the value of the voltage anode-cathode.However, if your chain has a nonzero resistance, it needs a decent power supply voltage.It is desirable that you use the power supply with multiple output voltages.And here's why.
protective layer, which grows on the product, insulator.As it increases its growing electrical resistance.To maintain the desired current density through the entire process must be adjusted several times amperage using the variable resistor.However
voltage may not be enough when the anode layer is sufficiently thick.In this case it is necessary to add tension.Therefore, the power supply must provide at least two output voltages.
Before work is necessary to prepare the equipment for anodizing.It usually takes several baths: for the treatment of small details, rather short and long products.They should be of aluminum.A suitable option is also polyethylene.As a small capacity can be used food container or long floral plastic pot.
bottom and walls of plastic tubs covered with sheets of aluminum is desirable.It can be cut from a sheet of aluminum pattern and bend impromptu "capacity".The point of this is to provide uniform current density all sides of the product.
Bath should differ well-insulated body, or otherwise electrolyte will it heat up too fast and it will have to be changed more frequently.The easiest solution would be taping a thick layer of foam bath - 2-4 centimeters.You can also fix the bath inside the box and fill the gap with foam construction.
After that you can make your bath a lead cathode.It can be made from a sheet of lead, removing the last with thick electric cables.Recall that the cathode area should be twice the surface area of the workpiece.This does not include the cathode surface, which is leaning against the wall.The cathode plate must present a gas outlet.
You can collect several pieces of the cathode lead, if there is not one.Pieces of a powerful soldering iron is recommended to solder, a thick seam along the joint.Try to repeat the configuration of the cathode surface of the part, addressed to him.The conclusion of the bath for a contact strip of the same material.Although well accepted and used thick copper wire insulation.Place insulate soldered silicone sealant.
So, in a plastic tub, you have filled electrolyte outlet has a power supply with current.To control the power supply to the circuit in the anodizing titanium or aluminum wire, connect a variable resistor.The containers are 2 items: a lead cathode in the form of a plate and an anode - the workpiece.When applying to them a current of oxygen is released and begins to grow anodic protective layer.
When you create high-quality electrical contact between the lead and the part you will observe microbubbles of oxygen, which slowly rise from the entire surface of the product.Their diameter is extremely small, for they remind wisps of smoke.The duration of the process is to control the visual - in color details.
For small parts it is 20-30 minutes for large products - an hour and a half.
Once the part is completely covered with a touch of gray-blue color, it should get out of the bathroom, wash under running cold water and wipe with a cotton swab that is moistened in a strong solution of manganese to remove the reaction by-products.The surface should be shiny, light-gray, smooth.
After the anodizing process houses some products become dark matte finish, it all depends on the mode of anodization.For coloring of anodized products by soaking them in a solution of an aniline dye, which is warmed to 50-60 degrees Celsius.Before working filter the solution, because the fine grains of undissolved dye capable of forming on the metal surface stains.The color intensity is generally no more than 15-20 minutes.
Once the item is purchased a beautiful shade and solid, not loose the protective layer, it is necessary to fix it.The fact that this coating has a micro porous structure which is permeable to air and water.This metal layer protects against mechanical damage, but weak against the chemical.
There are several methods that help to close micropores.The easiest - boil after anodizing parts in the pan in water for half an hour.It is best to use distilled water.Also, parts can hold on a steam bath, and for an hour.
You already know that there are several technologies anodizing aluminum parts from it.They differ in terms of workflow, or to be more specific - the temperature elektrolita, which is the main factor that affects the quality of the protective layer of the anode.At home, the preferred option anodizing cold, because in this case, the coating is obtained as and thicker, and the item becomes a beautiful color and luster.