Corrosion resistance
APT thermal spray coating applied for corrosion resistance !
In the application of thermal spraying coating in anti-corrosion, arc process spraying aluminum and zinc is the most common coating, which is widely used in bridge structure, offshore equipment, steel industry. HVOF sprayed chromium carbide has anti-wear and anti-corrosion function.
- High temperature corrosion
- Pitting corrosion
- Galvanic corrosion
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Corrosion Description
High temperature corrosion
High temperature corrosion is a non-galvanic form of corrosion of a metal exposed to an oxidizing atmosphere, such as sulfur, oxygen or other oxidizing compounds under very high temperature conditions for sustained periods. This type of corrosion is of great concern in gas turbine engines, and even automotive combustion engines.
Pitting corrosion
Pitting corrosion takes place not in broad areas, but in small cracks, or pits that form as a result of a low availability of oxygen or high concentrations of anions, such as chloride, which can prevent a surface from forming a passive film.
Galvanic corrosion
Galvanic corrosion occurs when dissimilar metals are in the presence of an electrolyte, attacking the more anodic metal. Galvanic corrosion can occur not only when two components of dissimilar metals are in this state, but also on a single component where the individual grains of an alloy have different potentials. Most often, the electrolyte is a saline, acidic or alkaline solution or atmosphere.
APT coating catalogue
High temperature corrosion solutions
nickel-chromium coating （APT-Ni206P）
1 Resist oxidation and corrosive gases in temperatures to 1000ºC.
2 These coatings are used as oxygen barriers under final coatings of ceramics.
3 They are also used to resist heat and prevent the scaling of carbon and low alloy steels in hot atmospheres
4 By Plasma process
Chromium Carbide - Nickel Chromium 75/25
(APT-CRC125)
1 Designed for HVOF guns with Dense, oxidation and erosion resistant coatings
2 Good hot gas corrosion resistance
3 Corrosion resistance against seawater
4 By HVOF process
NiAL 95/5 coating
(APT-Ni311A)
• Excellent bonding
• Oxidation and abrasion resistant at elevated temperatures
• Self bonding material.
• Suitable for dimensional restoration.
Pure Zn coating
(APT-Zn101A)
• Steel protection against corrosion both in atmospheric and immersed in either fresh or salt water
• EMI/RFI Shielding
• Electrical conductivity.
APT coating catalogue
Galvanic corrosion coating solutions
Pure Al coating （APT-AL101A）
1 Coatings are resistant to atmospheric, chemical and heat corrosion
2 Electrical and heat conductive.
3 By arc process
Stainless Steel 316L
(APT-CR325A)
1 Type 316L Austenitic Stainless Steel
2 Good corrosion resistance
3 Dimensional restoration.
MCrAlY coating
(APT-Co420P)
1 Plasma, HVOF
2 Excellent corrosion and oxidation properties up to 1040ºC (1900ºF)
3 Heat treatment is recommended for optimum performance
4 Typically used for either a TBC bondcoat or protection coating in high temperature corrosive or oxidizing environments.
Pure Zn coating
(APT-Zn101A)
• Steel protection against corrosion both in atmospheric and immersed in either fresh or salt water
• EMI/RFI Shielding
• Electrical conductivity.
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- Foshan，Guangdong Province，China
- +86 (0757) 86480270
- +86 135 7056 9748
- Tech Email: info@APTcoating.com
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