【Corrosion Technology Edition】Daily Question 20170715: What is dry corrosion?

Dry corrosion refers to the corrosion or oxidation that occurs in the absence of any contact with water (including but not limited to liquid water, aqueous solutions, or water vapor).

1. Corrosion that involves water or aqueous solutions is called wet corrosion, while corrosion caused by corrosive gases such as oxygen, CO2, and sulfur gases at high temperatures is known as dry corrosion. The products resulting from wet corrosion are referred to as rust, which can be further classified into red rust, white rust, and blue rust. 2. Dry corrosion refers to corrosion that occurs in dry gases (usually at high temperatures) or in non-aqueous solutions. Therefore, high-temperature corrosion is also a serious issue in the field of corrosion.

Corrosion at high temperatures by corrosive gases such as oxygen and sulfur-containing gases is known as dry corrosion.

Dry corrosion generally refers to corrosion that occurs in high-temperature gases, with high-temperature oxidation being the most common form. In high-temperature gases, an oxide film forms on the metal surface; the properties of this film and its growth patterns determine the metal’s corrosion resistance. The growth patterns of membranes can be divided into linear, parabolic, and logarithmic patterns. Oxidation following a linear pattern is the most dangerous, as the metal loss increases at a constant rate over time. The pattern observed for parabolas and logarithms is that the oxidation rate decreases as the film thickness increases, which makes it relatively safe; for example, aluminum follows a logarithmic pattern during oxidation at room temperature, and film growth stops after a few days, granting it good resistance to atmospheric oxidation.

It refers to corrosion that occurs in high-temperature gases.

Dry corrosion generally refers to corrosion that occurs in high-temperature gases, with high-temperature oxidation being the most common form. In high-temperature gases, an oxide film forms on the metal surface; the properties of this film and its growth patterns determine the metal’s corrosion resistance. The growth patterns of membranes can be divided into linear, parabolic, and logarithmic patterns. Oxidation following a linear pattern is the most dangerous, as the metal loss increases at a constant rate over time. The pattern observed for parabolas and logarithms is that the oxidation rate decreases as the film thickness increases, which makes it relatively safe; for example, aluminum follows a logarithmic pattern during oxidation at room temperature, and film growth stops after a few days, granting it good resistance to atmospheric oxidation.

It generally refers to corrosion that occurs in high-temperature gases, with high-temperature oxidation being the most common form. In high-temperature gases, an oxide film forms on the metal surface; the properties of this film and its growth patterns determine the metal’s corrosion resistance. The growth patterns of membranes can be divided into linear, parabolic, and logarithmic patterns. Oxidation following a linear pattern is the most dangerous, as the metal loss increases at a constant rate over time. The pattern for parabolas and logarithms is that the oxidation rate decreases as the film thickness increases. This is evident in the case of aluminum, which follows a logarithmic pattern during oxidation at room temperature; the growth of the film stops after a few days, which gives it good resistance to atmospheric oxidation.

Dry corrosion refers to corrosion that occurs in dry gases (usually at high temperatures) or non-aqueous solutions. Therefore, high-temperature corrosion is also a serious issue in the field of corrosion

It generally refers to corrosion that occurs in high-temperature gases, with high-temperature oxidation being the most common form. In high-temperature gases, an oxide film forms on the metal surface; the properties of this film and its growth patterns determine the metal’s corrosion resistance. The growth patterns of membranes can be divided into linear, parabolic, and logarithmic patterns. Oxidation following a linear pattern is the most dangerous, as the metal loss increases at a constant rate over time. The pattern observed for parabolas and logarithms is that the oxidation rate decreases as the film thickness increases, which makes it relatively safe; for example, aluminum follows a logarithmic pattern during oxidation at room temperature, and film growth stops after a few days, granting it good resistance to atmospheric oxidation. The forms of corrosion can be divided into uniform corrosion and local corrosion. In chemical production, the latter poses more severe hazards. Uniform corrosion occurs over the entire or most of the metal surface; it is also known as general corrosion. In most cases, a protective film of corrosion products forms on the metal surface, slowing down corrosion. Some metals, such as steel, dissolve rapidly in hydrochloric acid without forming a film. The average corrosion rate (i.e., the amount of material thickness lost per year in millimeters) is commonly used as a measure of the degree of uniform corrosion, and it also serves as a guideline for material selection. Generally, an annual corrosion rate of less than 1 to 1.5 mm is considered acceptable, ensuring a reasonable service life.

Dry corrosion refers to corrosion in dry gases (usually at high temperatures) or non-aqueous solutions.