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How many times more corrosion resistant is nickel alloy tubing than other common metals?
The corrosion resistance of nickel alloy tubing varies greatly depending on the specific alloy composition, the environment in which it is used, and the type of common metal to which it is compared, making it difficult to give an exact multiplier relationship. The following are some common situations illustrated:
In general corrosive environments: Using the common 304 stainless steel as a common metal comparison, nickel alloys such as Inconel 625 may be several times or even tens of times more resistant to pitting and crevice corrosion than 304 stainless steel in some neutral environments containing chlorides. This is because Inconel 625 contains higher levels of chromium, molybdenum and other elements that form a more stable, dense passivation film, while 304 stainless steel may pitting and other corrosion phenomena may occur more quickly in the same environment.
In a strong corrosive environment: for example, in the high temperature, high concentration of sulfuric acid environment, ordinary carbon steel may be seriously corroded in a short period of time, while Hastelloy C-276 nickel alloy tubes can maintain good corrosion resistance, service life can be tens of times or even hundreds of times that of carbon steel. Because Hastelloy C - 276 has excellent resistance to corrosion by reducing acids, while carbon steel lacks an effective protective mechanism in this environment, it will soon be corroded and destroyed.
It should be noted that the actual application, the corrosion situation is very complex, by the temperature, pressure, media concentration, flow rate and other factors, the specific corrosion resistance times need to be accurately assessed through professional corrosion tests and long-term field application data.