Choosing the Right Material for Chloride Corrosion

Fasteners for CHLORIDE CORROSION
Fighting chloride corrosion is one of the most common issues that face industrial processes. From industrial process in water treatment to pulp & paper as well as seawater applications, chlorides are very common and menace to industry. This brief newsletter shares insight into which materials for fasteners work best to defend against chloride corrosion to protect your equipment.

TITANIUM: Premium Chloride Protection
Titanium fasteners offer unparalleled resistance to chloride including chloride solutions, hypochlorites, chlorates, perchlorates, sodium chlorite, and chlorine dioxide. In addition, Titanium grade 5 fasteners also offer high strength of 148ksi UTS in addition to excellent chloride resistance. The only drawback is titanium cannot be used with dry chlorides or it will rapidly corrode.

DUPLEX STEEL: Localized Corrosion
Duplex fasteners offer an economic solution for high strength chloride resistance, especially for localized corrosion such as crevice and pitting, as well as stress corrosion cracking. Available in Duplex 2205 and Super Duplex 2507 for added strength.

AL6XN: Chloride & Reasonable General Corrosion Resistance
AL6XN bolts offers a high level of chloride resistance combined with high temperature usability (1000F), as well as moderate general corrosion resistance to other chemicals.

ALLOY 20: Chloride + Good General Corrosion Resistance
Alloy 20 fasteners are a good mid-range corrosion resistant alloy. They offer decent resistance to chloride but also good resistance to other chemicals such as sulfuric acid. They are also usable to 1000F