Corrosion Resistance Chart for Pressure Gauge with Metal Connectors

Disclaimer:
The information provided in this article is intended for general reference only. Users should ultimately make product selections for their applications based on their judgment of the materials, chemical substances, and corrosion factors involved. This article does not provide any form of warranty, expressed or implied.

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The careless use of this article may lead to accidents that endanger life and property. Most factories or corporations have chemical or corrosion-related material engineers who are better equipped to accurately specify instrument materials as they should be familiar with detailed information as well as experienced in their applications and usage.

This article is intended as a reference for users when they do not have access to such resources or other information sources. For any further questions, please consult customer service or a related professional expert to inquire about chemicals or conditions not covered in this article.

SJ Gauge: Pressure gauges or diaphragm pressure gauges, due to their measurement mechanics, have connectors that come into contact with the pressure source (medium). For fluids with corrosive properties, we often opt for pressure gauges with plastic connectors or diaphragms. The following list outlines the corrosion resistance of common plastic materials used in pressure gauges with different pressure sources (information is for reference only; actual conditions may vary, and on-site experience should be the primary consideration):

1. Stainless Steel 316/316L

Advantages:

• Ultra-low carbon 316L stainless steel minimizes harmful carbide precipitation caused by welding.
• Better corrosion resistance compared to 304 stainless steel.
• Excellent pitting corrosion resistance, good resistance to most chemicals in the paper, textile and photography industries.
• Good corrosion resistance in chloride environments, seawater and chemical environments (such as sulfur compounds, phosphoric acid and formic acid, as well as other organic acids).
• Good resistance to neutral and alkaline salts (including strong oxidizing salts).

Disadvantages:

• May corrode and crack in chloride solutions under internal/external stress.
• Susceptible to corrosion by non-oxidizing acids (most concentrations of sulfuric acid and hydrochloric acid).
• Prone to corrosion and cracking in warm chloride environments, especially above 60°C (140°F).

2. Hastelloy C

Advantages:

• Excellent resistance to seawater corrosion.
• Outstanding corrosion resistance in seawater and chloride salt environments.
• Applicable to various inorganic and organic chemical processes.
• Resistant to moist chlorine and concentrated chlorine salt solutions.
• Good resistance to various non-oxidizing media (sulfuric acid, phosphoric acid and acetic acid).
• Good resistance to mixed oxidizing acids (nitric acid/sulfuric acid, chromium/sulfuric acid, sulfuric acid/copper sulfate, chromic acid and high manganese acid salts).

Disadvantages:

• Susceptible to hydrogen embrittlement.
• Hydrogen permeation can be mitigated with a gold coating.

3. Monel Alloy, Nickel-Copper Alloy Series (Commonly used in instrumentation – Monel 400)

Advantages:

• Resistant to various reducing media (fluorine, hydrofluoric acid, sulfuric acid, hydrogen fluoride and derivatives).
• Excellent resistance to seawater.

Disadvantages:

• Not recommended for use in caustic alkali evaporators and concentrators.
• Susceptible to hydrogen embrittlement.
• Hydrogen permeation can be mitigated with a gold coating.

4. Tantalum

Advantages:

• Excellent corrosion resistance to most acids (hydrochloric acid, nitric acid, phosphoric acid, sulfuric acid and acidic ferric chloride solutions), saltwater solutions and organic chemicals.

Disadvantages:

• Susceptible to corrosion by sulfur trioxide, hydrofluoric acid and strong alkaline solutions.
• Embrittlement may occur in the presence of hydrogen gas, high-temperature oxygen or nitrogen gas.

O = This means the material is OK for the service. The uniform corrosion rate is less than 0.002 per year and there is no tendency for pitting or stress corrosion. This material may use a Bourdon tube, bellows, diaphragm, or lower housing.

L = Indicates the uniform corrosion rate is less than .020 inches per year and the material is suitable only for a diaphragm seal lower housing. It is NOT suitable for a Bourdon tube, bellows, or diaphragm.

X = This material is not recommended, insufficient information or complex restrictions cannot be addressed in this table.

				Material
Corrodent	Common Names & Formulas	Corrodent Temp. ºF MAX	Concentration % in H2O	316, 316L SS	Monel	Nickel	Hastelloy C276	Tantalum
ACETIC ACID		200	<40	O	X	X	O	O
ACETIC ANHYDRIDE		200	–	X	X	X	O	O
ACETONE		150	–	O	O	O	O	O
ACETYLENE, DRY		200	100	O	X	O	O	O
ACROLEIN		200	100	L	L	L	L	O
ALUMINUM CHLORIDE	AlCl3, Polyaluminum Chloride	150	–	X	X	X	O	X
ALUMINUM SULFATE	Alum. Al2(SO4)3	150	<50	L	X	X	O	O
AMMONIA ANHYDROUS	DOT Quality NH3	300	100	O	X	X	L	X
AMMONIUM CHLORIDE	Sal Ammoniac NH4Cl	200	<40	X	X	X	O	O
AMMONIUM HYDROXIDE	Ammonia Water NH3 in Water	120	<30	O	X	X	L	X
AMMONIUM NITRATE	Norway Saltpeter NH4NO3	200	<50	O	X	X	L	O
AMMONIUM SULFATE	(NH4)2SO4	200	<60	L	X	L	L	O
AMYL ACETATE		200	<60	O	X	X	O	O
ANILINE		250	–	O	L	L	X	O
BEER		200	>99	O	X	X	X	X
BENZENE	C6H6	200	–	O	O	O	X	O
BENZIDINE		200	<50	L	L	L	L	O
BENZOIC ACID		200	<99	L	L	L	O	O
BLACK LIQUOR		200	<70	X	X	X	X	X
BLEACH	<5% NaOCl	120	<5	X	X	X	O	O
BORIC ACID	H3BO4	150	<25	O	L	L	O	O
BROMINE, DRY (<57 PPM H2O)	Br	140	>99	X	L	L	L	O
BROMOBENZENE		200	>99	O	L	L	O	O
BUTADIENE (BUTYLENE)		200	>99	O	O	O	O	O
BUTANE		200	–	O	O	O	O	O
BUTYL ALCOHOL	C4H10	200	–	O	O	O	O	O
BUTYRIC ACID	Butanol	200	<10	L	X	X	O	O
CALCIUM BISULFATE	Ca(HSO3)2	250	>90	O	X	X	X	X
CALCIUM CHLORIDE	CaCl2	200	<80	X	X	X	O	O
CALCIUM HYDROXIDE	Slaked Lime Ca(OH)2	200	<50	L	X	X	O	O
CALCIUM HYPOCHLORITE	Ca(OCl)2	75<	<10	X	X	X	L	O
CARBON DIOXIDE, WET	CO2	150	>50 ppm	O	O	X	O	O
CARBON MONOXIDE	CO	200	>99	O	O	X	O	O
CHLORINATED WATER (<10ppm Chlorine)		70	<10 ppm	O	O	X	O	O
CHLORINATED WATER (To Saturation)		120	–	X	X	X	O	O
CHLORINE, DRY (<50PPM H2O)	Cl2	200	>99	X	X	L	L	O
CHLORINE, MOIST		160	>90	X	X	X	L	O
CHLOROACETIC ACID		150	<30	X	L	X	L	O
CHLOROFORM, DRY	Trichloromethane CHCl3	100	>99	O	O	O	X	O
CHROMIC ACID	Chromium Trioxide H2CrO4″	200	<30	X	X	X	X	O
CITRIC ACID		200	>10 <50	O	L	L	O	O
COPPER NITRATE	Cupric Nitrate Cu(NO3)2	200	<10	O	X	X	X	O
COPPER SULFATE	Cupric Sulfate CuSO4	200	<30	L	X	X	O	O
CREOSOTE	Coal-Tar	200	–	L	L	L	O	O
CRESOL		200	>99	O	O	O	O	O
CRUDE OIL – SOUR		<200	<5	X	O	X	O	O
CRUDE OIL – SWEET, LOW SULFUR		200	–	O	O	O	O	O
CUPRIC CHLORIDE	Copper Chloride	200	<40	X	X	X	X	O
DIESEL FUEL		140	–	O	O	O	O	O
DOWTHERM A		300	–	O	O	O	O	O
ETHANOL	Ethyl Alcohol C2H5OH	200	–	O	O	O	O	O
ETHANOL AMINES	MEA, DEA, TEA	120	100	O	O	L	O	O
ETHYL ACETATE		<200	–	O	O	O	O	O
ETHYL CHLORIDE, DRY	Chloroethane	<200	>99	X	O	O	O	O
ETHYLENE	Ethene	200	–	O	O	X	O	O
ETHYLENE GLYCOL	Glycol	200	>40	O	L	L	O	O
ETHYLENE OXIDE	ETO	100	>99	O	O	O	X	O
FERRIC CHLORIDE	FeCl3	200	<40	X	X	X	X	O
FERRIC SULFATE	Fe2(SO4)3	150	<10	O	X	X	O	O
FERROUS CHLORIDE	FeCl2	200	<30	X	X	X	L	O
FERROUS SULFATE	FeSO4	200	<50	X	X	X	L	O
FLUORINE, GAS DRY No Air or O2	F2	200	>99	X	O	O	X	X
FLUOROSILICIC ACID	Hydrofluosilicic Acid – H2SiF6	140	<30	X	X	X	X	X
FORMALDEHYDE		200	–	O	O	O	X	O
FORMIC ACID		<150	–	X	X	X	L	O
FUEL OIL, LIGHT	Diesel, No. 2, Heating Oil	140	–	O	O	O	O	O
FUEL OIL, HEAVY	Bunker, Resid, No. 6, Heavy Gas Oil	300	–	L	X	X	O	O
FURFURAL		200	<10	X	L	L	O	O
GASOLINE *FLOWING-PHOS BRONZE		200	–	O	X	X	O	O
GLUCOSE		300	–	O	O	O	O	O
GLYCERIN	Glycerol	200	–	O	O	O	O	O
HEXANE, DRY		200	>99	O	O	O	O	O
HYDRAZINE		100	–	X	X	X	X	X
HYDROBROMIC ACID	HBr	140	–	X	X	X	X	O
HYDROCHLORIC ACID	HCl, Muriatic Acid	100	<38	X	X	X	X	O
HYDROFLUORIC ACID (NO AIR)	HF	120	<50	X	X	X	X	X
HYDROFLUOSILIC ACID	Fluosilicic Acid	140	<30	X	X	X	X	X
HYDROGEN	H2	200	–	O	X	X	X	X
HYDROGEN PEROXIDE	H2O2	100	<30	O	X	X	X	O
HYDROGEN SULFIDE	H2S	140	–	X	X	X	O	O
KEROSENE	Kerosine	200	>99	O	O	O	O	O
LACTIC ACID		<100	<70	O	X	X	L	O
MAGNESIUM CHLORIDE	MgCl2	200	<40	X	X	X	O	O
MAGNESIUM SULFATE	Epsom Salts MgSO4	200	<40	O	O	O	X	O
MERCURIC CHLORIDE	HgCl2	200	<60	X	X	X	X	O
MERCURY	Quicksilver Hg	200	>99	O	X	O	O	X
METHANE DRY, NO H2S	CH4	200	–	O	O	O	O	O
METHANOL	Wood Alcohol	100	>99	O	O	O	O	O
METHYL ETHYL KETONE	M.E.K	120	>99	O	X	X	X	X
MILK		–	–	O	X	X	O	X
MORPHOLINE		200	>99	O	O	O	O	X
NAPHTHA	Benzin	200	>99	O	O	O	O	O
NAPHTHALENE	Tar Camphor C10H8	150	>99	O	O	O	X	L
NATURAL GAS, DOT QUALITY *Cu alloy <100PSI		150	–	O	L	X	O	O
NICKEL CHLORIDE	NiCl2	200	<80	X	X	X	O	O
NICKEL SULFATE	NiSO4	200	–	O	X	X	X	X
NITRIC ACID	HNO3	<100	<95	O	X	X	X	O
NITROUS OXIDE (DRY)	Laughing Gas N2O	<100	>99	L	X	X	L	O
N-METHYLPYRROLIDONE	NMP	70	>99	L	X	O	O	X
OLEIC ACID		200	–	L	L	L	L	O
OXALIC ACID		140	<50	X	X	X	L	O
OXYGEN GAS (“X6B”)	O2	120	–	O	O	X	O	O
OZONE	O3	120	<8	O	X	X	X	X
PALMITIC ACID		160	>99	O	X	X	O	X
PHENOL		120	>90	O	L	O	O	O
PHOSPHORIC ACID	H3PO4	100	<60	O	X	X	O	O
PHTHALIC ANHYDRIDE		200	>99	O	O	O	O	O
PICRIC ACID		200	<10	O	X	X	L	O
POTASSIUM CHLORIDE	KCl	150	<30	X	L	L	O	O
POTASSIUM HYDROXIDE	KOH	160	<50	L	O	O	L	X
POTASSIUM NITRATE	Saltpeter KNO3	200	<50	L	L	L	L	O
POTASSIUM NITRITE	KNO2	200	<50	L	L	L	L	X
POTASSIUM PERMANGANATE M	KMnO4	140	<30	X	X	X	X	O
PROPANE	C3H8	200	>99	O	O	O	O	O
PROPYLENE		200	>99	O	O	O	O	O
ROSIN		200	–	O	O	O	O
SEA WATER *Monel not for Diaphragms	Ocean Water	200	–	X	O*	X	O	O
SEWAGE, RAW		100	–	L	L	X	O	O
SILICONE OIL	PDMS	140	–	O	O	O	O	O
SILVER NITRATE (Acid free)	AgNO3	200	<50	L	X	X	X	O
SKYDROL		200	100	O	O	O	O	O
SODIUM BICARBONATE	Baking Soda NaHCO3	<200	<20	O	O	O	L	X
SODIUM BISULFATE	NaHSO4	<200	<30	X	L	L	L	O
SODIUM BISULFITE	NaHSO3	<150	<40	X	L	X	L	O
SODIUM CARBONATE	Soda Ash Na2CO3	<200	<40	O	O	O	O	O
SODIUM CHLORIDE	Table Salt NaCl	<200	<30	X	O	L	O	O
SODIUM CHROMATE	Na2CrO4	<200	<60	O	O	O	O	O
SODIUM CYANIDE	NaCN	<140	–	O	X	X	X	O
SODIUM DICHROMATE	Na2Cr2O7	<140	<20	O	X	X	X	X
SODIUM HYDROXIDE	Caustic Soda NaOH	<150	<40	O	O	O	O	X
SODIUM HYDROXIDE	Caustic Soda NaOH	<200	<70	X	O	O	L	X
SODIUM HYPOCHLORITE	NaOCl, Bleach	120	<40	X	X	X	X	O
SODIUM NITRATE	Chile Saltpeter NaNO3	<200	–	O	X	O	X	O
SODIUM NITRITE	NaNO2	<200	<60	O	O	O	O	O
SODIUM PERMANGANATE (pH >6, no chlorides)	NaMnO4	<120	<50	O	X	O	O	O
SODIUM PEROXIDE	Na2O2	<200	<10	O	L	L	L	X
SODIUM PHOSPHATE (TRIBASIC)	TSP Na3PO4	<200	<60	O	O	O	O	O
SODIUM SILICATE	Water Glass	<200	–	O	O	O	L	O
SODIUM SULFATE	Na2SO4	<200	<30	O	L	L	L	O
SODIUM SULFIDE	Na2S	<200	<30	L	L	L	L	O
SODIUM SULFITE	Na2SO3	<200	<30	O	X	X	O	O
SODIUM THIOSULFATE	Na2S2O3	<200	–	O	O	L	L	O
SOUR GAS / OIL		<200	<5	X	O	X	O	O
STANNOUS CHLORIDE	Tin Dichloride SnCl2	<200	<50	X	X	X	X	O
STEAM (WITH SIPHON)		<300	–	O	O	O	O	O
STEARIC ACID		<200	–	O	X	O	O	O
STODDARD SOLVENT		<150	–	O	O	O	O	O
SULFAMIC ACID		<150	<95	X	X	X	L	O
SULFUR	S	250	>95	X	X	X	O	O
SULFUR DIOXIDE, WET	SO2	140	–	L	X	X	L	O
SULFUR HEXAFLUORIDE	SF6	120	–	O	O	O	O	O
SULFUR TRIOXIDE, DRY	SO3	140	>99	L	X	L	O	X
SULFURIC ACID <60%	H2SO4	200	<60	X	X	X	X	O
SULFURIC ACID 80-98%	H2SO4	200	<98	X	X	X	X	O
TANNIC ACID	Tannin	<150	–	O	O	X	X	O
TARTARIC ACID		<150	<50	O	O	X	X	O
TOLUENE	Toluol	<200	>99	O	O	O	O	O
TRICHLOROACETIC ACID		<200	<50	X	L	X	O	X
TRICHLOROETHANE 1,1,1, DRY		<150	>98	O	O	O	O	O
TRICHLOROETHYLENE, DRY		<200	>99	O	O	O	O	O
TURPENTINE		<200	>98	O	O	O	O	O
UREA	Carbamide, DEF	<200	<50	O	X	X	X	X
VINYL CHLORIDE		<100	>99	O	O	X	O	O

This article provides limited information, and various applications come with different conditions that cannot be covered through the table in this article. The table is based on uncontaminated chemicals rather than complex mixtures. Additionally, many of the chemicals listed in this article are hazardous or toxic. In cases where information is insufficient, the risk is high or the chemical is extremely hazardous, material recommendations should not solely rely on the information provided in this article.

Users are responsible for conducting tests in their applications or consulting qualified and reliable material engineers, especially when dealing with chemicals that pose high risks or fall under the category of extremely hazardous substances.