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Corrosion Mechanism Of Seawater Equipment

Baoji City Changsheng Titanium Co.,Ltd

Corrosion Mechanism Of Seawater Equipment

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Brand Name : Changsheng Titanium alloy pipe

Model Number : Oil Pipe

Certification : ISO9001

Place of Origin : Shannxi,Baoji

MOQ : 10 pcs

Price : usd 1000-5000 per pc

Supply Ability : 100 pcs per month

Delivery Time : 7-21 days

Packaging Details : Standard export plywood case

Materials : titanium alloy TC4

advantage : excellent anti-corrosion performance

Case : HIGHER WAY Oil plant

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Corrosion mechanism

1. Contact corrosion of dissimilar metals

The so-called contact corrosion of dissimilar metals refers to the corrosion of the micro-battery caused by the conduction of the materials in the solution due to the different potentials of different materials.

When different metal materials are placed in seawater, they will exhibit their own specific potential. When metal materials with different potentials are used in contact with each other, the phenomenon of miniature batteries will be formed through the electrolyte solution (seawater). In this way, the low-potential material becomes the anode, which accelerates corrosion. The material with high potential becomes the cathode and inhibits the occurrence of corrosion. This phenomenon is contact corrosion of dissimilar metals.

In order to prevent the occurrence of contact corrosion of dissimilar metals, the following methods can be used: cathodic anti-corrosion method is to use high-potential materials as the cathode to inhibit corrosion; avoid different types of metals in contact with each other and mix them together. The insulating plate and the insulating bolts should be insulated between the two; the area ratio of the anode and the cathode should be considered as small as possible; in addition, the anode metal should not only be sprayed when spraying the paint, but the cathode metal should also be sprayed.

2. Crevice corrosion

Many metal components are connected by screws, riveting, welding, etc., and there may be narrow gaps at the defects of these connectors or welded joints. The width of the gap (usually 0.025-0.1mm) is sufficient to allow the electrolyte solution to enter the gap. The metal and the metal outside the seam form a short-circuit galvanic cell, and strong corrosion occurs in the seam. As shown in Figure 2-1, this localized corrosion is called crevice corrosion.

In order to prevent crevice corrosion, gap fillers can be used to prevent seawater from intruding into the gap. At the same time, it is also possible to use advanced material surfacing in advance to prevent crevice corrosion. In addition, the cathodic anti-corrosion method can also effectively prevent the occurrence of crevice corrosion.

crevice corrosion

Fig.2-1 Crevice corrosion between steels and its schematic diagram

3. Stress crack corrosion

The stress corrosion cracks of stainless steel are caused by the destruction of the static film by chloride ions. Stress corrosion will not occur below 50°C, so general seawater equipment does not need to be specially considered for stress corrosion. The occurrence of stress corrosion requires both stress and corrosive environment. In order to prevent stress corrosion, it is first necessary to reduce stress (external stress and residual stress). The main reason for the deepening of stress corrosion cracks is the anodic reaction at the end, and the cathodic anti-corrosion method is used to prevent stress corrosion.

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