noticias de la compañía sobre How to Prevent Corrosion in Steel Space Frames Used in Humid or Industrial Environments

Why Steel Space Frames Corrode

Steel corrodes when moisture and oxygen reach its surface, and the rate depends heavily on the environment. A space frame in a dry inland area may last decades with modest protection; the same frame near the coast, in a chemical plant, or in a humid processing shed faces a much harder service life. Because a space frame is exposed on many surfaces — members, balls, bolts, and the many small details of its nodes — corrosion protection is not a single coat of paint but a system applied to the whole structure.

It is also worth remembering that corrosion rarely starts uniformly. It begins at the weakest point — a cut edge, a scratch, a thread, a weld — and spreads from there. Protecting the frame therefore means protecting its details, because the coating on a flat member can be perfect while the joint beside it fails first.

The Conditions That Drive Corrosion

• Humidity — sustained moisture keeps the steel surface wet and drives the corrosion reaction.
• Salt — coastal and marine air carries chlorides that accelerate attack, especially on bolt threads and node details.
• Industrial atmosphere — chemical plants, smelters, and factories release aggressive compounds that attack coatings and bare steel alike.
• Condensation — temperature swings produce water on surfaces and inside enclosed sections, where it is hard to see and slow to dry.
• Damaged coating — any scratch, chip, or unrepaired weld exposes bare steel and becomes the starting point for corrosion.

The environment also changes over the life of the building. A site that starts dry may become humid as operations change, and a new plant nearby can alter the local atmosphere. Because corrosion protection is difficult to upgrade once the frame is built, it is worth choosing protection for the environment the building is likely to see, not only the one it sees on day one.

Painting System vs Hot-Dip Galvanizing

Two protection routes dominate steel space frames. Hot-dip galvanizing immerses the fabricated steel in molten zinc, forming a metallurgically bonded coating that protects even edges and threads, and it suits members and weldable nodes. A painting system applies a prepared surface with primer and topcoats, offering a wide choice of colors and easier touch-up on site. Many frames use galvanizing for the structural steel and paint for selected areas, or a combined system, depending on the environment and the client's preference. The choice between the two is driven by environment, service life expectation, and site conditions. Galvanizing is often preferred for structures that will be hard to reach for maintenance; painting is often preferred where color and appearance matter or where touch-up on site is expected.

Surface Preparation Comes First

No coating performs well over a poor surface. Mill scale, rust, oil, and welding spatter must be removed to the level the coating requires before galvanizing or painting. Surface preparation is the step most often under-specified and most often responsible for early coating failure, so it deserves as much attention as the coating itself.

Bolts and Nodes Need Attention

Bolted connections concentrate risk: threads, contact faces, and ball details are where moisture gathers and where coating is hardest to apply evenly. Threads should be protected without being clogged, and cut or damaged areas should be repaired after assembly. For welded nodes, coating must cover the weld and the heat-affected zone around it, since these are common points of early corrosion. Threads can also be protected with suitable coatings that keep the connection serviceable, so protection and assembly are planned together rather than in conflict.

Roof Drainage and Maintenance Inspection

Water that cannot drain sits on the structure and shortens the life of any coating. Correct roof slopes, clear gutters and downpipes, and sealed details all reduce standing water. After commissioning, a simple inspection routine — checking coating condition, looking for rust blooms at nodes and bolts, and touching up damage promptly — extends service life far more cheaply than repainting an entire frame. Corrosion protection is a system, and like the structure itself, the details decide how well it works.

A written inspection interval — checking coating condition after the first year and then at regular intervals — turns maintenance from a reaction into a routine, and it keeps small coating damage from turning into structural corrosion.