Description

What Is a Corrosion Test Coupon?

A corrosion test coupon is a small, precisely weighed metal strip placed inside a pipeline, vessel, or water system to measure material loss over time. Operators retrieve the coupon, weigh it, and calculate the corrosion rate from the weight difference. Therefore, the method gives direct, quantitative data that electronic probes cannot always match. EMT machines every corrosion test coupon to tight dimensional and surface tolerances so your readings stay consistent from one monitoring cycle to the next.

Corrosion Test Coupon Material Options

Material choice decides what your data reveals. A carbon steel corrosion test coupon reflects the behavior of your actual line pipe. In contrast, a 316 stainless or duplex coupon tests resistance in aggressive, chloride-rich service. We also supply exotic alloys such as Inconel, Hastelloy, and titanium for high-temperature or highly corrosive duty. Specifically, common options include:

• Carbon steel (A36, A105, 1018)
• 304 / 316 stainless steel
• Duplex and super duplex stainless
• Inconel 600 / 625, Hastelloy C276
• Brass, copper, and aluminum

Where Should You Use Corrosion Test Coupons?

Use coupons wherever you need verified weight-loss data. For instance, oil and gas gathering lines use them to track sweet and sour corrosion. Cooling water and boiler systems rely on them to validate treatment programs. Additionally, chemical plants, refineries, and desalination units deploy coupons in bypass loops for continuous assessment. As a result, a trusted corrosion test coupon supplier like EMT helps you match material and geometry to each service condition.

Why Choose EMT Corrosion Test Coupons?

We control the full process from raw bar stock to final packaging. Consequently, you receive coupons with certified material, consistent finish, and documented dimensions. Our standard coupons fit most coupon holders and bypass racks. However, we also cut custom shapes—rectangular, round, and stepped—to your drawing. As a dependable corrosion test coupon supplier, EMT supports both spot purchases and recurring supply contracts.

Key Features

• Tight tolerances— Machined to ±0.025 mm so weight-loss data stays comparable cycle to cycle.
• Certified material— Every batch ships with mill test report and material certificate.
• Broad alloy range— From carbon steel to Inconel, matching your actual service metal.
• Standard & custom shapes— Rectangular, round, and stepped coupons cut to your drawing.
• Clean, consistent finish— Degreased and packaged to prevent pre-exposure contamination.
• Fast reordering— Recurring supply plans keep your monitoring program uninterrupted.

Specifications

Attribute	Specification
Standard size	50 × 25 × 2 mm (2 × 1 × 0.08 in)
Available shapes	Rectangular, round, stepped, strip
Materials	CS, 304/316 SS, duplex, Inconel, Hastelloy, Ti
Surface finish	320 grit, degreased
Tolerance	±0.025 mm on dimensions
Mounting	Fits standard coupon holders & bypass racks
Certificate	MTR + material cert per batch
Packaging	Sealed, anti-tarnish individual pouches

FAQ

What is a corrosion test coupon used for?

It measures weight-loss corrosion in pipelines, water systems, and process equipment. You weigh it before and after exposure, then calculate the corrosion rate from the mass difference.

Which corrosion test coupon material should I choose?

Match the coupon to your actual equipment metal. Choose carbon steel for line-pipe service, 316 or duplex for chloride environments, and exotic alloys for high-temperature or severe duty.

How long should a coupon stay in service?

Typical exposure runs 30 to 90 days, depending on corrosion rate and monitoring goals. Faster-corroding systems need shorter cycles for accurate readings.

Do you supply coupons to recognized standards?

Yes. Our machining and handling follow ASTM G1 and NACE/AMPP practices for corrosion coupon preparation and evaluation.

Can EMT make custom corrosion coupons?

Yes. We cut custom shapes, sizes, and alloys from your drawing or sample, including stepped and round geometries.