Why does stainless steel rust on a boat?

Welding, grinding and buffing leave heat tint and embedded iron on the surface, and salt air attacks those sites first, producing tea staining and rust streaks. The base alloy is fine; the surface was never restored. Electropolishing or passivation removes the contamination so the alloy performs as designed.

Can you restore corroded stainless boat hardware?

Yes. Harrison pickles and electropolishes used rails, davits, anchors and hardware to remove rust, tea staining and pitting and return the part to a bright, passive condition.

Is electropolishing better than buffing for marine stainless?

Yes. Buffing smears metal over defects and embeds abrasive iron, which corrodes at sea. Electropolishing removes the damaged layer and leaves a chromium-rich, passive, mirror-bright surface that lasts.

Is 316 or 304 better for marine hardware?

316 contains molybdenum and resists chloride pitting better than 304, so it is the usual choice at sea. Either alloy benefits from electropolishing; without it, even 316 can tea stain where the surface is contaminated.

Electropolishing and Passivation for Marine and Boat Components

Electropolished welded stainless steel assembly with a mirror finish at Harrison Electropolishing

The short answer: Salt air and seawater find every weld, scratch and bit of embedded iron on stainless marine hardware and turn it into tea staining, rust streaks and pitting. Electropolishing removes that damaged surface layer and leaves a chromium-rich, mirror-bright finish that resists corrosion far longer than a buffed or as-welded part. Harrison electropolishes and passivates new and used marine stainless — rail assemblies, davits, anchors, ladders, boxes and custom hardware — and restores corroded components to their original brilliance.

Components we finish

Welded rail and handrail assemblies. Complete assemblies electropolished after welding so the heat-affected zones are as corrosion-resistant as the tube.

Davits, cranes and anchor hardware. Davits, anchors, anchor guides and rollers electropolished for corrosion resistance and appearance.

Ladders, boxes, cleats and deck hardware. Batch electropolishing with the same mirror finish across the set.

Restoration of used and corroded parts. Pickling and electropolishing remove rust, tea staining and pitting from stainless hardware in service and return it to a bright, passive condition.

Why electropolished marine stainless lasts longer

Mechanical buffing hides surface defects under smeared metal and leaves embedded iron from the abrasives; the first season at sea brings it back as rust streaks. Electropolishing dissolves the outer layer of metal, removes embedded iron and the damage from welding and grinding, and leaves a surface enriched in chromium. The result is a passive, mirror-bright finish with far fewer sites for chloride pitting to start. Electropolished parts are passive as finished; parts that are only passivated per ASTM A967 gain the corrosion resistance without the bright finish. See does electropolishing improve corrosion resistance.

Capacity

The Houston facility has four overhead cranes and 15,000 lb material-handling capacity, so complete rail assemblies and davit structures are processed without cutting them apart. Harrison has electropolished marine stainless for boat builders and boat owners since 1980 and is ISO 9001 and ISO 14001 certified.

Representative project

A Gulf Coast boat builder delivering a custom sportfishing yacht needed the complete welded 316 rail assemblies, tuna tower and anchor hardware electropolished to a uniform mirror finish before installation. Harrison electropolished the assemblies whole, finished the hardware in a matching batch, and returned the set on the builder's installation schedule. The finish matched across every component and the heat-affected zones at the welds were as bright and corrosion-resistant as the tube.

Request a marine quote

Tell us the components, the alloy, the dimensions of the largest assembly, whether the parts are new or in service, and your delivery date. We quote within one business day; expedited service is available and lead times vary with shop load.

Request a Quote · Call 800-245-5707

More to Know

Frequently Asked Questions

Why does stainless steel rust on a boat?

Welding, grinding and buffing leave heat tint and embedded iron on the surface, and salt air attacks those sites first, producing tea staining and rust streaks. The base alloy is fine; the surface was never restored. Electropolishing or passivation removes the contamination so the alloy performs as designed.

Can you restore corroded stainless boat hardware?

Yes. Harrison pickles and electropolishes used rails, davits, anchors and hardware to remove rust, tea staining and pitting and return the part to a bright, passive condition.

Is electropolishing better than buffing for marine stainless?

Yes. Buffing smears metal over defects and embeds abrasive iron, which corrodes at sea. Electropolishing removes the damaged layer and leaves a chromium-rich, passive, mirror-bright surface that lasts.

Can you electropolish a complete welded rail assembly?

Yes. The Houston facility has four overhead cranes and 15,000 lb material-handling capacity, so complete assemblies are processed whole for a uniform finish.

Is 316 or 304 better for marine hardware?

316 contains molybdenum and resists chloride pitting better than 304, so it is the usual choice at sea. Either alloy benefits from electropolishing; without it, even 316 can tea stain where the surface is contaminated.

Request a Quote

800-245-5707

Electropolishing

Harrison Electropolishing, the Leading Electropolishing, Passivation, Oxygen Cleaning & Mechanical Polishing Company World Wide.

Electropolishing is an electrochemical process by which surface material is removed by anodic dissolution. Electropolishing removes surface material, beginning with the high points within the microscopic surface texture. By removing these points, the electropolishing process will improve the surface finish of a metal such as stainless steel, nickel, and Hastelloy, leaving a smoother and more reflective surface. Common parts and components electropolished include tanks, piping, fittings, rods, discs, large parts & surfaces, and more.