MMO Titanium Anode Field Series   |  Baoji Titanium Valley

     For decades, the corrosion world had a dirty secret: we knew how to protect a pipeline — but we had no clean way to protect the tank farm around it.

     You can drive a deep-well anode 40 meters into the ground. You can hang a sacrificial zinc bracelet on a subsea line. But the moment you walk into a refinery tank farm — hundreds of crisscrossing buried pipes, tank bottoms, cable trays, and grounding grids in the same 50×50 meter pad — traditional cathodic protection falls apart.

The bottleneck wasn’t the current. It was the geometry.

1. The Problem: Tank Farms and Dense Pipe Racks Have No “Anode Real Estate”

In a petrochemical station or crude tank farm, you hit four walls at once:

Shielding — a point anode 20 meters away can’t push current past the first row of pipes. The back rows stay under-protected.

No space for anode beds — you can’t dig a 30 m deep well under a tank foundation or between two live product lines.

Mixed potentials — grounding grids and adjacent steel create stray-current interference; over-protect one structure, you polarize another the wrong way.

Aging coating — old lines have 40–60% coating holiday loss; point anodes either over-cook the near field or never reach the far field.

The old answers all had a cost:

What the industry needed was an anode that was thin, continuous, bendable, buried in the same trench as the pipe, and alive for 30+ years.

That anode is the flexible MMO titanium ribbon — GR1 substrate, Ir-Ta coating, rolled like wire.

2. The Bottleneck: Making a “Ribbon” That Doesn’t Die in Year 6

A strip of titanium is easy. A strip that stays electrochemically alive for 30–50 years in wet soil is not.

Three hard problems:

Coating adhesion on a thin, flexible substrate — brush/spray Ir-Ta on 0.635 mm titanium, sinter at 450 °C, then bend it 100 times. Most labs crack the oxide.

Uniform current, no hot spots — if the coating load varies 10% along the ribbon, one section burns out and the whole roll fails.

Joint & continuity — a 150 m roll has to be electrically continuous end-to-end, with a cable splice that survives IPX8 burial for decades.

For years, the spec lived only in NACE TM0108 and a few imported brands. Domestic shops could cut titanium strip; almost none could coat it reliably.

3. The Baoji Fix: A Cluster-Scaled Breakthrough

This is the part the industry outside China rarely sees. Baoji — the “Titanium Valley” — didn’t solve this in one factory. It solved it as a cluster.

What the lead houses pooled

Substrate discipline: TA1 (Gr1) cold-rolled strip, controlled Ra, oxalic etch, zero ferrous stringers, de-burred edges so the coating never starts from a micro-crack

Coating system: IrO₂-Ta₂O₅ thermal decomposition, 8–20 g/m² noble load, multi-pass brush + 420–480 °C sinter, continuity-checked per 10 m

Geometry standard: 6.35×0.635 mm and 12.7×0.9 mm became the de-facto domestic ribbon sizes; bend radius ≤50 mm per GB/T 33637

Joint know-how: Ti-Cu transition crimp + silver braze + epoxy + heat-shrink, IPX8 rated

Field layout rules: concentric ring for tank bottoms, parallel offset for pipe racks, 17 mA/m baseline, 50-year design target

What Shaanxi Ruifuxiang (RFX) brought to the table

Inside that collaboration, Shaanxi Ruifuxiang Industry and Trade Co., Ltd. owned the part that looks boring and isn’t:

Supplied certified GR1 titanium strip (ASTM B265, MTC 3.1) with the surface finish the coaters needed — no re-grind, no contamination

Ran the substrate incoming-inspection loop for multiple local coaters: Ra check, chloride residue check, edge-burr check

Participated in roundtable work on ribbon open-area vs backfill contact — the variable that decides whether current stays uniform under a tank bottom

Validated custom widths and 150/152 m roll packaging for EPC contractors who needed to lay a whole tank-ring from one continuous spool (no mid-field splice)

What the cluster gave back

4. Where Flexible MMO Titanium Ribbon Goes

The TAM isn’t small. Global flexible MMO anode demand for tank-bottom and station CP alone runs into the hundreds of millions of dollars a year, and it’s shifting from “imported only” to “Baoji-sourced” fast.

5. RFX Production Size Table (Flexible Ribbon Anode)

Substrate: ASTM B265 Gr1, TA1, with MTC EN 10204 3.1

Coating: IrO₂-Ta₂O₅ (soil/freshwater/concrete) · RuO₂-IrO₂-Ta₂O₅ (seawater)

Bend radius: ≤50 mm · Joint: IPX8 sealed Ti-Cu transition · Standard: NACE TM0108, GB/T 33637

6. Shaanxi Ruifuxiang — The Substrate Behind the Ribbon

Shaanxi Ruifuxiang Industry and Trade Co., Ltd. (Baoji, 2017) is the quiet layer under a lot of Baoji’s MMO ribbon output:

Anode-grade GR1 / GR2 titanium strip, wire, mesh, tube, plate — full non-ferrous catalog (Ti, Zr, Nb, W)

Surface-ready substrate: controlled Ra, oxalic etch, de-burred edges, vacuum-seal within 24 h, no ferrous cross-contact

Fastener & component line alongside anode materials: titanium bolts, nuts, washers, flanges, custom forgings

Standards: ASTM B265 / B348 / F467 / F468, GB/T 2965, ISO 5832, DIN / JIS

Pre-sales engineering: we ask soil resistivity, coating holiday %, design current, tank diameter, roll length before quoting

Post-sales: same-heat reorder, coating-feedback loop, NCR replacement, photo-logged pre-shipment

In a tank farm, the anode you can’t see is the one that decides whether the bottom spalls in year 12. We make sure that anode starts with clean titanium.

7. Bottom Line

Tank farms and dense pipe racks broke traditional CP: shielding, no drill space, stray current, aging coating

The fix is continuous flexible MMO titanium ribbon — thin, bendable, 30–50 yr life, laid in the same trench

Baoji cluster solved the coating + joint + substrate problem together; ~12–15 patents shared downstream

Saved the supply chain 30–60% on cost, opened export-grade margins, and made “50-year tank-bottom CP” a standard spec

RFX provides the certified GR1 substrate behind the ribbon

RFX · Titanium you can trace, anode substrate you can trust · www.tiwwrfx.com

References

[1] MMO/Ti flexible anode for tank bottom & dense piping — shielding, bend radius, IPX8. GB/T 33637-2017, NACE TM0108.

[2] Tank-bottom ICCP with MMO ribbon, concentric ring layout, 17 mA/m, 50 yr. Bihaizhou Corrosion Protection.

[3] MMO ribbon specs: 6.35×0.635 / 12.7×0.9 mm, 152 m roll, Ir-Ta. Bangxin CP.

[4] Ir-Ta coating microstructure, dimensional stability, low consumption. Cathodic Protection Tech Review.

[5] MMO tubular & ribbon anode for deep well / tank farm, Gr1 substrate. Baoji Ruicheng Titanium.

[6] Flexible anode economics: no anode bed, 30–50 yr life, 40–60% lifecycle saving. Fangfuzhijia.

[7] MMO wire anode: Φ1–3 mm, 20–50 yr, soil & seawater. Bosida.

[8] Baoji Titanium Valley cluster — shared MMO anode process baseline. Baoji Titanium Industry Association.

[9] Mesh/ribbon MMO anode, Ir-Ta, concrete & underground steel. Xi’an Taijin.