The thresholds of the car are one of the parts of the automotive body, which is most susceptible to the aggressive effect of the environment. Drops of temperature, high humidity, aggressive chemicals that sprinkle roads in winter - all this is extremely negatively affects the paintwork of the body.

Thresholds on the car, why thresholds, bottom doors and arches very quickly come into disrepair

Sooner or later, the corrosion process is launched on the surface of the vulnerable parts of the body. First of all, "suffer" the thresholds, bottom of the door, and the arches of the car. In addition to rust, the above-mentioned body elements are subject to regular effects of torque and bending moments, as well as strong vibrations. Very often on the surface of the thresholds appear dents by the fault of the most car owner, as a consequence of the wrong use of the jack. However, in this case, the repair of thresholds can be made on their own. Sometimes you need to replace the inserts, impose a patch, or do other repair work, which will be discussed below.

Metal corrosion, cause of rapid corrosion

The corrosion process turns very quickly turns the metal into a rusty pipe. For example, from the entire "black" metal world, a 10% rust kills in the first year. The two main causes of metals corrosion are electrochemical and chemical.

chemical corrosion

Chemical corrosion does not spare neither black neither non-ferrous metals.
This process proceeds in a medium that does not conduct an electric current (dry gas mixtures, alcohols, different types of petroleum products, etc.). The intensity of the process flow may increase in parallel with the increase in ambient temperature. As a result, a characteristic oxide film appears on the metal surface.

electrochemical corrosion

For the full flow of this process, a sufficiently thin electrolytic film on its surface, which can be formed by conventional water. However, the most common cause of electrochemical corrosion is the total use of technical and household salts, which are sodium and potassium chlorides, and are used to eliminate ice and snow on the roads in winter. Not only cars, but also underground communications suffer from chlorides. For example, only in the United States annual losses from the use of salt make up more than 2 billion dollars.

Thresholds on auto, what kind of sills

By material manufacturing, the thresholds are divided into plastic and metal. The plastic option is the cheapest, but also the most short-lived. The rapids from the plastic almost always go in the standard configuration of cars and very quickly come into disrepair.

Metal thresholds are much more durable and reliable. The choice of metal thresholds is quite diverse - aluminum profile, stainless steel, alloys with chromium content, etc.

Especially for the fans of automotive tuning manufacturers make custom-made special lights with backlight, which are connected to the wiring, and the lamps light up when the doors are opened. At the same time, the thresholds are illuminated by a pleasant light that not only gives the car the original look, but also helps comfortably sit down or fall out of the car in the dark.

Removable thresholds, welded thresholds, what is the difference

According to the method of compounding with the body, car thresholds can be removable or, as they are also called, mobile, as well as welded to the car body.

Removable car thresholds are made of plastic or metal, and are attached to the body with the help of self-tapping screws. In the event of the need for repair, such thresholds are very easy to remove, perform the necessary work and attach back.

Specifications for repair thresholds

For repair of removable thresholds, you will need:

• Workbench.
• okovanyanki.
• Kiyanka, other metal straightening tools.

For the repair of non-removable thresholds:

• Workbench.
• Spotter or welding machine.
• Manual exhaust, for smooth and gently eliminating dents.
• Hammers for support and richt.
• okovanyanki.
• Bulgarian.
• Other plumbing tools.

Removable thresholds when you can renovate removable thresholds, and in what cases it is better to put new

With small damage, removal thresholds can be repaired independently. Such work is mainly carried out without using the welding machine - it is enough to make a straight or extract. If working carefully, it is possible to even do without painting the details, because although threshold and removable, but such works are considered to be a body repair.

Ceads pull carefully, trying not to damage the paint coating. If traces of corrosion detected on the threshold, it is necessary to estimate the degree of damage. If it is insignificant, you can do a small patch. With a larger damage to the corrosion threshold, there is no particular sense in repairing - the item is easier and faster to replace.

Welded thresholds, repair methods, pros

As mentioned above, quite often the thresholds get damage not only from stones and borders, but also from an incorrectly installed jack when replacing the wheel. Before proceeding to eliminate dents and other repair work, it is necessary to evaluate the severity of damage, after which it is necessary to select the necessary tools and materials.

With a small and moderate severity of damage, the welded thresholds can be repaired. To remove dents or small bias and do not damage the paint, the extractor and plotter are used.

If deebly deeper and pull them out, it does not work, then in the lateral part of the threshold make the rectangular hole in which the oskovalenka is inserted. After that, the dent is gently squirting with a straight hammer.

The main ways to repair car thresholds with welding is replaced by the welded thresholds, and installing patches for damaged places.

If damage is sufficiently serious, metal cuts are made in several places. After the end of the rotational work, cuts are closed by plexus. With damage to the threshold of corrosion, damaged areas are cut with a grinder, make the pattern along which the patch is then cut. The patch is welded on a damaged place.

Today there are technologies with which you can independently fix the welding threshold without using the welding machine. For this, fiberglass and epoxy glue are used.

What if damaged thresholds and rack

If simultaneously with the threshold was damaged, they produce their simultaneous replacement. In this case, the algorithm of action is quite simple. First of all, the middle rack spar is cut. Before starting straightening the spar, you need to make sure that the car body does not contain damage. After that, the installation site is carefully cleaned, all extra particles of metal are cleaned.
Next, the surface of the spar is aligned and customized, after which the mounting and welding work is made - it remains only to install the door and adjust all the gaps.

What can handle metal to protect against corrosion

auto chemical protection

The compositions intended to protect the car body (anticorros) are divided into several categories: formulations intended for processing hidden cavities, and compositions for applying to the body surface.

Funds for hidden cavities, in turn, are divided into two categories: the first oil-based preparations with liquid consistency are included. This allows them to penetrate into the most hard-to-reach places and fill the microcracks in the paint coating. Corrosion protection provides corrosion inhibitors included in the drug - substances that slow down the corrosive process, as well as a fatty oil film that protects the metal surface from contact with moisture. The only significant disadvantage of these drugs is low mechanical strength, and the inability to hold on vertical surfaces.

The second type of anticorroser for processing hidden cavities is preparations based on paraffin. Corrosion inhibitors included inhibitors only work when the drug is in a liquid state (that is, some time after applying). When the solvent evaporates from the drug, inhibitors almost completely cease to effect. After drying, the drug forms a wax film, which completely overlaps the access of oxygen to the metal. Paraffin-based compounds are not very durable, therefore used exclusively for processing the hidden cavities of the car body.

To apply to the outer surface, the compositions are used on a bitumen basis. Bituminous mastics are based on synthetic and bitumen resins. They simultaneously perform several tasks: protect the bottom, arches and thresholds from aggressive environmental impact, and protection against mechanical damage.

Sometimes the manufacturer includes corrosion inhibitors mastic, but rather in preventive purposes. The drug will not be able to protect the scratched metal from corrosion. It is much more important than its protective, "observed" properties - mastic should be kept tight on the metal surface, even after strikes about stones, borders and other obstacles.

Mastics are applied to the surface with a thick layer, so that are a good noise insulator. Some preparations after applying are hardening and well opposed to mechanical effects, but they can crack, others do not dry completely, while maintaining excellent elasticity, but poorly oppose mechanical impacts.

polyrol

Present substances in the idea of \u200b\u200bpasta or emulsion. Are divided into:

• Restorative.
• Protective.
• Combined.
• Wax polishes.

In the process of restoration treatment of the surface, the polyrolla is partially removed, frosted, matte (oxidized) sections of paint, as well as small scratches. Polishing is performed by special polishing machines. In this case, abrasive pastes and compositions of different graininess are used.

The soft polishing is made if the paintwork coating is worn weakly, and it is only necessary to restore the shine of the surface. Unlike restorative polishing, only finishing polishing formulations are used in this case.

anti-growing film

Another way to protect the most vulnerable parts of the body, including thresholds. Each manufacturer of the anti-agviline film enhances its product, claiming that it is his film that has all the necessary qualities. In fact, such an advertisement is intended only for justifying the high price of goods.

The film cutting is performed using a computer and special electronic patterns, cutting with a plotter. Cool film Any service tinting glass. It is not difficult to remove the film - all glue remains on its surface, and not on the surface of the thresholds.

Electrochemical Protection

It is absolutely harmless to the owner and its car, a way to protect the thresholds and other hard-to-reach places of the car body.
The principle of operation is very simple, and is based on the principle of interaction of a galvanic pair (car body and electrodes). At the same time, the body plays the role of the cathode, the anode serve steel plates. They are fixed in the most problematic places of the body, where corrosion is most often formed. As a result of the difference in the electrical potentials, the metal of the anodes is oxidized and gives free electrons with metal of the body, thus restoring it.

So that electrochemical protection worked as efficiently as possible, it is necessary to install from two to three tens of anodes, whose shelf life is up to eight years.

Plastic pad on the threshold, advantages and disadvantages

Of the advantages of plastic linings, it is necessary to note the cheaper and efficiency of this method of protection of the thresholds. Plastic protects thresholds well from dirt and mechanical damage.

If we talk about the shortcomings, the plastic pad cannot protect the metal from moisture, which is "closed" to it, contributing to the occurrence of corrosion. Therefore, plastic lining on the threshold is recommended only after anti-corrosion processing.

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