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The iso-corrosion chart below shows the relative corrosion resistance of several specialty alloys and exotic metals in various concentrations and temperature of hydrochloric acid (hydrogen chloride). Such alloys will typically be applied when stainless steel shows insufficent corrosion resistance in hydrochloric acid. It can be seen that the corrosion attack of hydrochloric acid, as with most acids, is highly dependent on the temperature. Chloride containing acids will in many situations show a corrosive nature similar to hydrochloric acid at comparable acid and/or chloride concentrations. 

For precision parts such as valves, fittings and instrumentation where tolerances are critical to their operation, a corrosion rate 5 mil/year or larger would typically be considered unacceptable in hydrochoric acid applications.

Hydrochloric acid iso corrosion chart
Hydrocloric Acid corrosion charts. The corrosion resistance of Titanium, Zirconium, Nickel alloy (Hastelloy), niobium and Tantalum. A corroion rate higher than 5 mpy in hydrogen chloride is not above practical acceptance limits for valves in Hydrochloric
Hydrochloric Acid Iso Corrosion Curves for Hastelloy (nickel alloy), Titanium, Zirconium, Noibium and Tantalum.

Compared with other specialty metals and alloys like Hastelloy, niobium and zirconium, the corrosion resistance of tantalum metal is second to none in hydrochloric acid. Tantalum metal is an element (atomic number 73) and is considered to be the most corrosion resistant metals commercially available. At temperature less than 150C and a concentration less than 30%, tantalum is considered to have a nil corrosion rate or less than 1 mil/year in chlroride acid service.

The table below shows the relative corrosion resistance in hydrochloric acid at concentrations in the range 5 to 35% and temperatures up to 200C.

Selection of Stainless Steel fo Handling Sulphur Dioxide SO2 and Sulphur Trioxide SO3
Selection of Stainless Steel for Handling Phosphoric Acid H3PO4
Selection of Stainless Steel for Handling Hydrofluoric Acid HF
Selection of Stainless Steel for Handling Citric Acid C3H4OH (COOH)3
Selection of Stainless Steel for Handling Ammonia NH3
Selection of Stainless Steel for Handling Chlorine Cl2 and Chlorine Dioxide ClO2
Selection of Stainless Steels For Handling Hydrochloric Acid HCl
Selection of Stainless Steel for Handling Sulphuric Acid H2SO4
Selection Stainless Steel for Handling Sodium Hydroxide NaOH
Selection of stainless steels for handling acetic acid (CH3COOH)
Selection of stainless steels for handling sodium hypochlorite (NaOCl)
Selection of stainless steels for handling nitric acid (HNO3)
NACE MR 0175/ISO 15156 for Corrosion Resistant Alloys for Sulphide Service
Selection of stainless steels in water supply and waste water treatment

Corrosion | Metallographic Test | Metallographic Test Report | Stress Corrosion Cracking | Chloride SCC | Minimizing Chloride SCC | Stainless Steel Corrosion | ntergranular Corrosion | Stainless Steel Intergranular Corrosion | Corrosion of Piping Corrosion Resistant Stainless Steel | Corrosion Resistant Material | Corrosion Resistance | Seawater Resistance | Corrosion Mechanism | Corrosion Process | Surface Coatings for Corrosion | Galvanic Corrosion | Galvanic Corrosion Risks | Causes of Metal Corrosion | Stainless Steel for Corrosion Resistance | ASTM A262 | ASTM E112 | Corrosion Resistance Table | Metals Corrosion Resistance | Oxidation Resistance | NACE MR0175/ISO 15156 | Carbon on Corrosion Resistance

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