If a bladder type fuel tank is to be left empty for an extended period of time, the inside of the tank should be coated with a film of

Question

BlackTom AI · Accepted Answer

Bladder-type fuel tanks are typically manufactured from rubberized fabric or elastomeric materials that can dry out, harden, and crack if left empty and exposed to air for long periods.

1. Relevant knowledge points and concepts
- Elastomer behavior: Rubber and other elastomers lose plasticizers and oxidize when exposed to air, becoming brittle.  
- Protective films: Drying oils (like linseed oil) penetrate slightly into the surface, then form a thin protective film that preserves flexibility and blocks air/oxidation.  
- Compatibility: Any storage coating must not swell, dissolve, or chemically degrade the bladder material, nor leave residues that contaminate fuel on return to service.

2. Step-by-step reasoning
- Identify the problem: Empty bladder tank is exposed to air; the rubber can harden and crack, shortening service life.  
- Select protection method: A light internal coating that prevents air contact and replenishes surface oils is required. Drying oils are historically and practically used for this purpose.  
- Evaluate options given: engine oil, ethylene glycol, linseed oil. Consider chemical behavior and compatibility with rubber and later fuel use. Linseed oil is a drying oil that forms a thin protective film; engine oil is non-drying and leaves residues; ethylene glycol is an antifreeze that is hygroscopic and can damage rubber and attract water.

3. Calculations/intermediate steps
- Not applicable for this qualitative materials question.

4. Why linseed oil is correct
Linseed oil penetrates the rubber surface slightly and then oxidizes to form a thin, protective film that preserves flexibility and limits oxidation. It does not leave a sticky contaminant that will cause fuel-system problems when the tank is refilled if applied sparingly and wiped/vented before service.

5. Why the other options are incorrect
- Engine oil: Non-drying, leaves viscous residue that can collect dirt and contaminate fuel; it does not form a protective film that preserves elastomer flexibility in storage.  
- Ethylene glycol: Hygroscopic antifreeze, incompatible as an internal coating; it can degrade rubber compounds and introduce water into the system.

6. Conclusion
Applying a light film of linseed oil inside a bladder-type fuel tank before extended storage preserves the elastomer and prevents drying and cracking. Final answer: linseed oil.

If a bladder type fuel tank is to be left empty for an extended period of time, the inside of the tank should be coated with a film of单项选择题

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