CN203728928U - Magnesium alloy sacrificial anode for preventing automobile exhaust pipes from corroding - Google Patents

Abstract

The utility model relates to a magnesium alloy sacrificial anode for preventing corrosion of automobile exhaust pipes. The magnesium alloy sacrificial anode is a magnesium alloy metal ring (1) or a strip-shaped sacrificial anode, which is pasted on the inner wall side of the automobile tailpipe (2). . The magnesium alloy metal ring (1) has an opening of 10-20mm, the cross section of the magnesium alloy metal ring (1) is trapezoidal, the lower bottom is 20mm, the upper bottom is 16mm, and the height is 3-5mm. The strip-shaped sacrificial anode is 200mm long, 20mm wide, and ≤5mm high; the magnesium alloy metal ring (1) or the long strip-shaped sacrificial anode includes a common magnesium alloy anode metal ring or a high-potential magnesium-manganese anode metal ring. The utility model effectively protects the muffler and the tailpipe of the exhaust pipe from corrosion; the unclosed magnesium alloy metal ring does not cause the accumulation of corrosive media and increases the anticorrosion efficiency; the structure is simple and the installation is convenient and quick , to facilitate the modification of the exhaust system of the retained vehicle. At the same time, the cost increase caused by switching to high anti-corrosion grade materials is also avoided.

Description

A Magnesium Alloy Sacrificial Anode for Preventing Corrosion of Automobile Exhaust Pipes

technical field

The utility model relates to a cathodic protection technology capable of preventing corrosion of an automobile exhaust system, in particular to a magnesium alloy sacrificial anode for preventing corrosion of an automobile exhaust pipe.

Background technique

Magnesium alloy sacrificial anode has extremely high electrochemical performance, uniform anode consumption, long life, and large power generation per unit mass. It is an ideal sacrificial anode material and is suitable for cathodic protection of metal structures in aqueous media.

In recent years, with the increasingly stringent regulations, in order to adapt to the international trend of resource saving and environmental friendliness, higher requirements have been put forward for the typical components of the engine exhaust system.

Automobile exhaust system refers to the system that collects and discharges exhaust gas. Starting from the outlet of the engine exhaust manifold, it mainly includes seven parts, including the front pipe, bellows, catalytic converter assembly, muffler, resonator, connecting pipe, and tail pipe. Taking the bellows as the dividing point, the system is divided into two parts: hot end and cold end; the hot end part mainly requires high temperature performance, such as high temperature oxidation, corrosion, and fatigue performance, and the cold end part mainly requires exhaust gas condensate corrosion resistance. Due to the harsh environment and great changes in the environment of the automobile exhaust system, the components of the exhaust system are easily corroded or rusted during use and placement, so the anti-corrosion design is the focus and difficulty of the exhaust system design.

The existing method to solve the corrosion of the automobile exhaust system is mainly to improve the material grade and replace the corrosion-resistant material with a higher anti-corrosion grade. Cold-end parts mainly require corrosion resistance to exhaust gas condensate, mainly referring to mufflers and tailpipes. The following table:

Table 1 Selection of materials for cold end components of the exhaust system

Table 2 Corrosion resistance and cost index of commonly used stainless steel

(◎: Excellent ○: Good △: Fair ×: Poor)

It can be seen from the above table that the cost of replacing high-grade corrosion-resistant materials is too high; in addition, the number of automobiles in my country is huge. In order to control costs, automobile companies generally use materials with low anti-corrosion grades, which has caused the existing automobile exhaust system. Severe corrosion.

Utility model content

The key technical problem to be solved by the utility model is to overcome the corrosion or rust that is easily produced by the muffler and tailpipe during the use and placement of the automobile exhaust system without increasing the grade of anti-corrosion materials and causing excessive cost problem, protect it from corrosion.

In order to realize the purpose of this utility model, propose following technical scheme:

A magnesium alloy sacrificial anode for preventing corrosion of automobile exhaust pipes. The magnesium alloy sacrificial anode is a magnesium alloy metal ring 1 or a strip-shaped magnesium alloy metal strip. The magnesium alloy metal ring 1 and the magnesium alloy metal strip are attached to the inner wall side of the automobile tailpipe 2 to electrically connect the two.

The magnesium alloy metal ring 1 has an opening, and the opening is located at the lowest depression of the automobile tail pipe 2; the strip-shaped magnesium alloy metal strip is attached to the innermost depression along the axial direction of the automobile tail pipe 2.

The opening of the magnesium alloy metal ring 1 is 10-20mm.

The cross-section of the magnesium alloy metal ring 1 is trapezoidal, with a lower base of 20 mm, an upper base of 16 mm, and a height of 3-5 mm; the magnesium alloy metal strip is 200 mm long, 20 mm wide, and ≤5 mm high.

The composition of the magnesium alloy metal ring 1 and the magnesium alloy metal strip is common magnesium alloy or high potential magnesium manganese alloy.

Compared with the prior art, the utility model has the following beneficial effects:

(1) Effectively protect the muffler and tailpipe of the exhaust pipe from corrosion;

(2) The unclosed magnesium alloy metal ring is used, which will not cause the accumulation of corrosive media and increase the anti-corrosion efficiency;

(3) New cars can be equipped with metal rings to avoid the cost increase caused by switching to high-grade anti-corrosion materials;

(4) The structure is simple, the installation is convenient and fast, and the modification of the exhaust system of the vehicle is convenient.

Description of drawings

Fig. 1 is a schematic diagram of the utility model;

Fig. 2 is a cross-sectional view of the magnesium alloy sacrificial anode metal ring related to the utility model;

Fig. 3 is a longitudinal sectional view of the metal ring of the magnesium alloy sacrificial anode related to the utility model;

Fig. 4 is the transverse sectional structural diagram of the utility model embodiment;

Fig. 5 is a longitudinal sectional structural view of the embodiment.

in,

1 Magnesium alloy metal ring 3 Corrosion medium

2 car tailpipe

In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is the principle diagram of the present utility model; As shown in the figure, when automobile tailpipe 2 inner surface forms corrosive medium 3 due to condensation, between the magnesium alloy metal ring 1 of sacrificial anode, automobile tailpipe 2 and corrosive medium 3 An electric field is formed between them, and the magnesium alloy metal ring 1 of the sacrificial anode is used as a protective pole, and is connected with the automobile tailpipe 2 to form a primary battery. Avoid corrosion and be protected.

Fig. 2 and Fig. 3 have shown the utility model relates to the transverse section and longitudinal sectional view of magnesium alloy sacrificial anode metal ring; In Fig. 2 and Fig. 3, the magnesium alloy metal ring 1 of magnesium alloy sacrificial anode is made as shown in the figure metal ring.

The section of the magnesium alloy metal ring 1 of the utility model is trapezoidal, the lower bottom is 20 mm, attached to the inner wall side of the exhaust tube, the upper bottom is 16 mm, and the height is not more than 5 mm.

The utility model can also adopt a strip-shaped sacrificial anode, the strip-shaped sacrificial anode is 200mm long, 20mm wide, and ≤5mm high, and is attached to the lowest depression inside the exhaust cylinder along the axial direction of the exhaust cylinder.

Chemical Composition of Magnesium Alloy Sacrificial Anode

In the embodiment of the utility model shown in Fig. 4 and Fig. 5, a magnesium alloy metal ring 1 of a sacrificial anode is respectively embedded in the inner side of the pipe wall at the lowest part of the automobile muffler and the automobile tailpipe 2, and the outer circumference of the magnesium alloy metal ring It is connected with the inner circumference of the automobile exhaust pipe. The magnesium alloy metal ring 1 of the sacrificial anode is an open metal ring. When installing, its opening is located at the bottom of the automobile exhaust pipe. The installation method can be directly clamped, spot welded or bolted. way to electrically connect the two.

The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the present utility model in detail. It should be understood that the above descriptions are only specific embodiments of the present utility model and are not intended to limit In the present utility model, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims (4)

1. The magnesium alloy sacrificial anode is characterized in that the magnesium alloy sacrificial anode is a magnesium alloy metal ring (1) or a strip-shaped magnesium alloy metal strip, and the magnesium alloy metal ring (1) and the magnesium alloy metal strip are attached to the inner wall side of an automobile tail pipe (2) in a direct clamping, spot welding or bolt fixing mode to be electrically connected; the magnesium alloy metal ring (1) is provided with an opening which is positioned at the lowest depression of the tail pipe (2) of the automobile; the strip-shaped magnesium alloy metal strip is attached to the lowest position on the inner side along the axial direction of the automobile tail pipe (2).

2. The sacrificial magnesium alloy anode according to claim 1, wherein the opening of the magnesium alloy metal ring (1) is 10-20 mm.

3. The sacrificial magnesium alloy anode according to claim 2, wherein the cross section of the magnesium alloy metal ring (1) is trapezoidal, the lower bottom is 20mm, the upper bottom is 16mm, and the height is 3-5 mm; the magnesium alloy metal strip is 200mm long, 20mm wide and less than or equal to 5mm high.

4. The sacrificial magnesium alloy anode according to claim 3, wherein the magnesium alloy metal ring (1) and the magnesium alloy metal strip are made of common magnesium alloy or high potential magnesium manganese alloy.